CN106936141B - Active power control method and control system of a flexible ring network controller - Google Patents

Active power control method and control system of a flexible ring network controller Download PDF

Info

Publication number
CN106936141B
CN106936141B CN201511023217.5A CN201511023217A CN106936141B CN 106936141 B CN106936141 B CN 106936141B CN 201511023217 A CN201511023217 A CN 201511023217A CN 106936141 B CN106936141 B CN 106936141B
Authority
CN
China
Prior art keywords
active power
voltage
converter station
active
current
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201511023217.5A
Other languages
Chinese (zh)
Other versions
CN106936141A (en
Inventor
杨杰
阳岳希
高凯
庞辉
李强
李正文
周杨
许韦华
马巍巍
别晓玉
朱钰
王超
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electric Power Research Institute of State Grid Liaoning Electric Power Co Ltd
State Grid Smart Grid Research Institute of SGCC
State Grid Corp of China SGCC
Original Assignee
Electric Power Research Institute of State Grid Liaoning Electric Power Co Ltd
State Grid Smart Grid Research Institute of SGCC
State Grid Corp of China SGCC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Electric Power Research Institute of State Grid Liaoning Electric Power Co Ltd, State Grid Smart Grid Research Institute of SGCC, State Grid Corp of China SGCC filed Critical Electric Power Research Institute of State Grid Liaoning Electric Power Co Ltd
Priority to CN201511023217.5A priority Critical patent/CN106936141B/en
Publication of CN106936141A publication Critical patent/CN106936141A/en
Application granted granted Critical
Publication of CN106936141B publication Critical patent/CN106936141B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/36—Arrangements for transfer of electric power between AC networks via high-voltage DC [HVDC] links; Arrangements for transfer of electric power between generators and networks via HVDC links
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/36—Arrangements for transfer of electric power between AC networks via high-voltage DC [HVDC] links; Arrangements for transfer of electric power between generators and networks via HVDC links
    • H02J2003/365—Reducing harmonics or oscillations in HVDC
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

本发明涉及一种柔性环网控制器的有功功率控制方法及其控制系统，包括：定有功功率侧换流站成有功电流参考值

Figure DDA0000896838470000011
定有功功率侧换流站的有功电流参考值
Figure DDA0000896838470000012
由通讯光纤传输到对侧换流站，即定直流电压侧换流站；定直流电压侧换流站生成直流电压的参考信号Udcref；利用站间通讯，定直流电压侧换流站的直流电压控制器接收有功电流参考值
Figure DDA0000896838470000013
经引入附加信号
Figure DDA0000896838470000014
的外环直流电压控制器生成定直流电压侧换流站的正序d轴电流参考值
Figure DDA0000896838470000015
本发明提供的技术方案利用站间通讯，在定直流电压侧换流站的直流电压控制器中引入定有功功率换流站生成的有功电流参考值作为附加信号，通过两端换流站的协调控制，实现对柔性环网控制器传输有功功率的快速调节。

Figure 201511023217

The invention relates to an active power control method of a flexible ring network controller and a control system thereof, comprising: determining an active current reference value of a converter station on an active power side

Figure DDA0000896838470000011
Determine the active current reference value of the converter station on the active power side
Figure DDA0000896838470000012
It is transmitted by the communication optical fiber to the opposite side converter station, that is, the converter station on the fixed DC voltage side; the converter station on the fixed DC voltage side generates the reference signal U dcref of the DC voltage; The voltage controller receives the active current reference
Figure DDA0000896838470000013
Additional signals are introduced
Figure DDA0000896838470000014
The outer-loop DC voltage controller generates the positive-sequence d-axis current reference value of the converter station at the constant DC voltage side
Figure DDA0000896838470000015
The technical solution provided by the present invention utilizes inter-station communication to introduce the active current reference value generated by the constant active power converter station into the DC voltage controller of the constant DC voltage side converter station as an additional signal, and through the coordination of the converter stations at both ends Control, realize the rapid adjustment of the active power transmission of the flexible ring network controller.

Figure 201511023217

Description

一种柔性环网控制器的有功功率控制方法及其控制系统Active power control method and control system of a flexible ring network controller

技术领域technical field

本发明涉及柔性环网控制器的控制策略，具体涉及一种柔性环网控制器的有功功率控制方法及其控制系统。The invention relates to a control strategy of a flexible ring network controller, in particular to an active power control method of a flexible ring network controller and a control system thereof.

背景技术Background technique

柔性环网控制器为背靠背柔性直流，其控制系统结构对称，主要由内环电流控制器、外环功率控制器、锁相同步环节和触发脉冲生成环节等几个部分组成。其中，常用的外环控制器形式有：定直流电压控制、定有功功率控制、定无功功率控制、定交流电压控制等。外环控制器跟踪系统级控制器给定的参考信号。为了保持系统的有功功率平衡，系统必须有一侧换流站采用定直流电压控制，而另一侧换流站采用定有功功率控制。The flexible ring network controller is a back-to-back flexible DC, and its control system has a symmetrical structure, which is mainly composed of an inner loop current controller, an outer loop power controller, a phase-locked synchronization link and a trigger pulse generation link. Among them, the commonly used outer loop controller forms are: constant DC voltage control, constant active power control, constant reactive power control, constant AC voltage control, etc. The outer loop controller tracks the reference signal given by the system-level controller. In order to maintain the active power balance of the system, one side of the system must be controlled by constant DC voltage, while the other side of the system must be controlled by constant active power.

在需要柔性环网控制器短时间内提升或者回降所连两端交流系统所传输的有功功率时，定功率侧换流站所接收的上级有功功率指令值Pset发生变化，原始控制策略仅仅依靠定有功功率侧的换流站完成调节：一方面有功功率响应变化存在一定时延，另一方面有功功率变化会使直流电压产生较大波动，因此当柔性环网控制器需要提供有功功率支撑时，此种控制响应时延存在一定的弊端。When the flexible ring network controller needs to boost or drop the active power transmitted by the connected AC systems at both ends in a short time, the upper-level active power command value Pset received by the converter station on the constant power side changes, and the original control strategy only relies on The converter station on the fixed active power side completes the adjustment: on the one hand, there is a certain delay in the active power response change, on the other hand, the active power change will cause large fluctuations in the DC voltage, so when the flexible ring network controller needs to provide active power support , this control response delay has certain drawbacks.

发明内容SUMMARY OF THE INVENTION

为解决上述现有技术中的不足，本发明的目的是提供一种柔性环网控制器的有功功率控制方法及其控制系统，本发明的方法是一种基于站间通讯的柔性环网控制器有功功率快速协调控制的方法。In order to solve the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide an active power control method of a flexible ring network controller and a control system thereof. The method of the present invention is a flexible ring network controller based on inter-station communication. A method for fast coordinated control of active power.

本发明的目的是采用下述技术方案实现的：The purpose of this invention is to adopt following technical scheme to realize:

本发明提供一种柔性环网控制器的有功功率控制方法，其改进之处在于，所述方法包括下述步骤：The present invention provides an active power control method of a flexible ring network controller, and the improvement lies in that the method comprises the following steps:

(1)定有功功率侧换流站生成有功电流参考值

Figure BDA0000896838450000011
；(1) Determine the active current reference value generated by the active power side converter station
Figure BDA0000896838450000011
;

(2)定有功功率侧换流站的有功功率参考值

Figure BDA0000896838450000012
由通讯光纤传输到对侧换流站，即定直流电压侧换流站；(2) Determine the active power reference value of the converter station on the active power side
Figure BDA0000896838450000012
It is transmitted by the communication optical fiber to the opposite side converter station, that is, the converter station on the fixed DC voltage side;

(3)定直流电压侧换流站生成直流电压的参考信号Udcref；(3) The converter station on the constant DC voltage side generates the reference signal U dcref of the DC voltage;

(4)定直流电压侧换流站的直流电压控制模块接收

Figure BDA0000896838450000013
信号；(4) The DC voltage control module of the converter station on the constant DC voltage side receives
Figure BDA0000896838450000013
Signal;

(5)定直流电压侧换流站生成正序d轴电流参考值

Figure BDA0000896838450000024
(5) The DC voltage side converter station generates the positive sequence d-axis current reference value
Figure BDA0000896838450000024

进一步地，所述步骤(1)中，定有功功率控制侧换流站的有功功率控制模块接收上级有功功率指令值Pset，有功功率指令值Pset和用于抑制低频振荡和实现紧急功率支援等目的调制有功信号Pm通过有功功率调节环节，根据交流系统运行状态，生成有功功率参考值Pref_opp，根据需要设计不同的有功指令调节环节及上下限值；外环有功功率控制器根据有功功率参考值Pref_opp生成有功功率电流参考值

Figure BDA0000896838450000026
；Further, in the step (1), the active power control module of the converter station on the fixed active power control side receives the upper-level active power command value P set , the active power command value P set and is used to suppress low frequency oscillation and realize emergency power support. The equal-purpose modulated active signal P m passes through the active power adjustment link, and generates the active power reference value P ref_opp according to the operating state of the AC system, and designs different active command adjustment links and upper and lower limit values according to the needs; the outer loop active power controller according to the active power The reference value P ref_opp generates the active power current reference value
Figure BDA0000896838450000026
;

在三相电网电压平衡条件下，取电网电压矢量Us的方向为d轴方向，设计外环有功功率控制器，生成有功电流参考值

Figure BDA0000896838450000027
；Under the condition of three-phase grid voltage balance, take the direction of grid voltage vector Us as the d-axis direction, design the outer loop active power controller, and generate the active current reference value
Figure BDA0000896838450000027
;

Figure BDA0000896838450000021
Figure BDA0000896838450000021

其中：Us、isd、P交流电压，有功电流和有功功率。Among them: U s , isd , P AC voltage, active current and active power.

进一步地，所述步骤(3)中，定直流电压侧换流站的直流电压控制模块接收上级直流电压调度指令Udcset，经过直流电压调节环节生成直流电压的参考信号Udcref；根据需要设计不同的直流电压调节环节及上下限值。Further, in the step (3), the DC voltage control module of the converter station at the constant DC voltage side receives the upper-level DC voltage scheduling instruction U dcset , and generates the DC voltage reference signal U dcref through the DC voltage adjustment link; The DC voltage regulation link and upper and lower limit values.

进一步地，所述步骤(4)中，定直流电压侧换流站的直流电压控制器接收定有功功率侧换流站的有功电流参考值

Figure BDA0000896838450000028
，，作为附加控制信号。Further, in the step (4), the DC voltage controller of the converter station on the fixed DC voltage side receives the active current reference value of the converter station on the fixed active power side.
Figure BDA0000896838450000028
, as an additional control signal.

进一步地，所述步骤(5)中，直流电压的参考信号Udcref经过外环直流电压控制器后产生的信号与附加控制信号

Figure BDA0000896838450000029
相加，再经过限幅环节及变换环节，生成定直流电压侧换流站的正序d轴电流参考值
Figure BDA0000896838450000025
Further, in the step (5), the reference signal Udcref of the DC voltage is generated after passing through the outer loop DC voltage controller and the additional control signal
Figure BDA0000896838450000029
Add up, and then go through the limiting link and the conversion link to generate the positive sequence d-axis current reference value of the converter station on the constant DC voltage side
Figure BDA0000896838450000025

进一步地，采用定直流电压控制模式的换流器用于平衡直流系统有功和保持直流侧电压稳定；在忽略R和换流器损耗时，定直流电压控制模式的换流器交直流两侧的有功保持平衡，即：Further, the converter using the constant DC voltage control mode is used to balance the active power of the DC system and keep the DC side voltage stable; when ignoring R and converter losses, the active power on both AC and DC sides of the converter in the constant DC voltage control mode is used. Keep a balance, that is:

Figure BDA0000896838450000022
Figure BDA0000896838450000022

稳态时：In steady state:

Figure BDA0000896838450000023
Figure BDA0000896838450000023

当VSC交直流两侧的有功不平衡时，将引起直流电压的波动，此时有功电流则将向直流侧电容充电或放电，直至直流电压稳定在设定值；对于定直流电压控制的换流器而言，相当于一个有功平衡节点；在所设计的定直流电压控制器中，直流电压和直流电压指令偏差经PI调节后作为有功电流的参考值

Figure BDA0000896838450000031
When the active power on the AC and DC sides of the VSC is unbalanced, the DC voltage will fluctuate. At this time, the active current will charge or discharge the DC side capacitor until the DC voltage stabilizes at the set value; for the commutation controlled by the constant DC voltage For the controller, it is equivalent to an active power balance node; in the designed constant DC voltage controller, the DC voltage and DC voltage command deviation are adjusted by PI as the reference value of active current
Figure BDA0000896838450000031

其中：Us、isd、Pdc、udc、idc分别交流电压，有功电流，直流功率，直流电压和直流电流。Among them: U s , i sd , P dc , u dc , and i dc AC voltage, active current, DC power, DC voltage and DC current respectively.

本发明提供一种柔性环网控制器的有功功率控制方法的控制系统，其改进之处在于，所述控制系统包括依次进行通讯的定有功功率侧换流站和定直流电压侧换流站；The present invention provides a control system for an active power control method of a flexible ring network controller, which is improved in that the control system includes a constant active power side converter station and a constant DC voltage side converter station that communicate in sequence;

所述定有功功率控制侧换流站包括依次进行通讯的有功功率控制模块和外环有功功率控制器模块；有功功率控制模块用于接收上级有功功率指令值Pset，有功功率参考值生成模块用于生成有功功率参考值Pref；外环有功功率控制器模块根据有功功率参考值Pref生成有功电流参考值

Figure BDA0000896838450000032
；The constant active power control side converter station includes an active power control module and an outer loop active power controller module that communicate in sequence; the active power control module is used to receive the upper-level active power command value P set , and the active power reference value generation module is used for To generate the active power reference value P ref ; the outer loop active power controller module generates the active current reference value according to the active power reference value P ref
Figure BDA0000896838450000032
;

所述定直流电压侧换流站包括直流电压控制模块；所述直流电压控制模块用于接收上级直流电压调度指令Udcset；并生成直流电压的参考信号Udcref。The converter station at the constant DC voltage side includes a DC voltage control module; the DC voltage control module is used for receiving the upper-level DC voltage scheduling instruction U dcset ; and generating a DC voltage reference signal U dcref .

与最接近的现有技术相比，本发明提供的技术方案具有的优异效果是：Compared with the closest prior art, the technical solution provided by the present invention has the following excellent effects:

本发明提供了一种基于站间通讯采用在定直流电压侧换流站的直流电压控制器中引入定有功功率侧换流站的中间控制信号作为附加信号，实现对传输有功功率快速调节的协调控制方法，具有以下显著效果：The invention provides a system based on inter-station communication by introducing the intermediate control signal of the converter station on the fixed active power side into the DC voltage controller of the converter station on the fixed DC voltage side as an additional signal, so as to realize the coordination of the rapid adjustment of the transmission active power. control method, with the following significant effects:

1.该方法利用站间通讯将定有功功率侧换流站根据有功功率指令值生成定直流电压控制侧换流站的直流电压控制器的附加信号，仿真结果表明该方法能将柔性环网控制器有功功率的调节时间缩减约30ms，明显提高控制响应速度。1. This method uses the inter-station communication to generate additional signals of the DC voltage controller of the constant DC voltage control side converter station according to the active power command value from the constant active power side converter station. The simulation results show that this method can control the flexible ring network. The adjustment time of the active power of the controller is shortened by about 30ms, which significantly improves the control response speed.

2.该方法与一般控制策略把调控有功功率的任务由单一换流站承担所不同，其将有功功率调控任务由两个换流站共同承担，提高了控制的灵活性，增强了系统稳定运行的能力，提高了经济性和安全性。2. This method is different from the general control strategy that the task of regulating active power is undertaken by a single converter station. It shares the task of regulating active power with two converter stations, which improves the flexibility of control and enhances the stable operation of the system. capability, improving economy and safety.

3.该方法在直流电压控制器中引入了对侧有功功率指令值所生成的信号，使直流电压的控制也更加稳定，能有效平抑有功功率变化过程中直流电压的波动，将直流电压波动由±6％～±7％控制到±1％以内。3. This method introduces the signal generated by the command value of the opposite side active power into the DC voltage controller, which makes the control of the DC voltage more stable, and can effectively suppress the fluctuation of the DC voltage during the change of the active power. ±6%～±7% is controlled within ±1%.

附图说明Description of drawings

图1是本发明提供的柔性环网控制器的有功功率控制方法的流程图；Fig. 1 is the flow chart of the active power control method of the flexible ring network controller provided by the present invention;

图2是本发明提供的基于站间通讯定有功功率侧附加信号引入到定直流电压侧控制器逻辑图；Fig. 2 is the logic diagram of the controller provided by the present invention, based on the inter-station communication, the additional signal from the constant active power side is introduced into the constant DC voltage side controller;

图3是本发明提供的有功功率控制的仿真结果图，其中：(a)上级有功功率指令值仿真结果；(b)直流电流仿真结果；(c)直流电压仿真结果；Fig. 3 is the simulation result diagram of active power control provided by the present invention, wherein: (a) upper-level active power command value simulation result; (b) DC current simulation result; (c) DC voltage simulation result;

图4是本发明提供的生成有功功率参考值的逻辑图；Fig. 4 is the logic diagram of generating active power reference value provided by the present invention;

图5是本发明提供的生成直流电压的参考信号的逻辑图；5 is a logic diagram of a reference signal for generating a DC voltage provided by the present invention;

图6是本发明提供的外环直流电压控制器的逻辑图；Fig. 6 is the logic diagram of the outer loop DC voltage controller provided by the present invention;

图7是本发明提供的外环有功功率控制器的逻辑图。FIG. 7 is a logic diagram of the outer loop active power controller provided by the present invention.

具体实施方式Detailed ways

下面结合附图对本发明的具体实施方式作进一步的详细说明。The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

以下描述和附图充分地示出本发明的具体实施方案，以使本领域的技术人员能够实践它们。其他实施方案可以包括结构的、逻辑的、电气的、过程的以及其他的改变。实施例仅代表可能的变化。除非明确要求，否则单独的组件和功能是可选的，并且操作的顺序可以变化。一些实施方案的部分和特征可以被包括在或替换其他实施方案的部分和特征。本发明的实施方案的范围包括权利要求书的整个范围，以及权利要求书的所有可获得的等同物。在本文中，本发明的这些实施方案可以被单独地或总地用术语“发明”来表示，这仅仅是为了方便，并且如果事实上公开了超过一个的发明，不是要自动地限制该应用的范围为任何单个发明或发明构思。The following description and drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process, and other changes. The examples are only representative of possible variations. Unless explicitly required, individual components and functions are optional and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. The scope of embodiments of the invention includes the full scope of the claims, along with all available equivalents of the claims. Herein, these embodiments of the invention may be referred to individually or collectively by the term "invention", which is for convenience only and is not intended to automatically limit the application if more than one invention is in fact disclosed The scope is any single invention or inventive concept.

柔性环网控制器是两个电压源换流器以背靠背形式，联结到交流电网输电线路中，通过对交流系统有功、无功的独立控制，实现电磁环网解列、故障隔离、无功支撑等功能。The flexible ring network controller is two voltage source converters connected to the transmission line of the AC power grid in a back-to-back form. Through the independent control of the active and reactive power of the AC system, the electromagnetic ring network decoupling, fault isolation, and reactive power support are realized. and other functions.

为了提高柔性环网控制器对有功功率的调控速度，本发明提供了一种基于站间通讯的快速有功功率控制方法，其流程图如图1所示，具体包括以下步骤：In order to improve the control speed of active power by the flexible ring network controller, the present invention provides a fast active power control method based on inter-station communication, the flowchart of which is shown in Figure 1, and specifically includes the following steps:

步骤(1)：定有功功率控制侧换流站的有功功率控制模块接收上级有功功率指令值Pset，有功功率指令值Pset和用于抑制低频振荡和实现紧急功率支援等目的调制有功信号Pm通过有功功率调节环节，根据交流系统运行状态，生成有功功率参考值Pref，根据需要设计不同的有功指令调节环节及上下限值。基于站间通讯定有功功率侧附加信号引入到定直流电压侧控制器逻辑图如图2所示。外环有功功率控制器根据有功功率参考值Pref生成有功电流参考值

Figure BDA0000896838450000042
。外环有功功率控制器的逻辑图如图7所示。在三相电网电压平衡条件下，取电网电压矢量Us的方向为d轴方向，设计外环有功功率控制器，生成有功电流参考值
Figure BDA0000896838450000043
；生成有功功率参考值的逻辑图如图4所示：Step (1): The active power control module of the converter station on the fixed active power control side receives the upper-level active power command value P set , the active power command value P set and the modulated active signal P for the purpose of suppressing low-frequency oscillation and realizing emergency power support, etc. m Through the active power regulation link, according to the operating state of the AC system, the active power reference value P ref is generated, and different active command regulation links and upper and lower limit values are designed as required. Based on the inter-station communication, the additional signal from the constant active power side is introduced into the controller of the constant DC voltage side as shown in Figure 2. The outer loop active power controller generates the active current reference value according to the active power reference value P ref
Figure BDA0000896838450000042
. The logic diagram of the outer loop active power controller is shown in Figure 7. Under the condition of three-phase grid voltage balance, the direction of grid voltage vector U s is taken as the d-axis direction, and the outer loop active power controller is designed to generate the active current reference value
Figure BDA0000896838450000043
; The logic diagram for generating the active power reference value is shown in Figure 4:

Figure BDA0000896838450000041
Figure BDA0000896838450000041

其中：Us、isd、P交流电压，有功电流和有功功率。有功功率控制的仿真结果图如图3所示，其中：(a)上级有功功率指令值仿真结果；(b)直流电流仿真结果；(c)直流电压仿真结果；Among them: U s , isd , P AC voltage, active current and active power. The simulation result of active power control is shown in Figure 3, where: (a) simulation result of upper-level active power command value; (b) simulation result of DC current; (c) simulation result of DC voltage;

步骤(2)：定有功功率侧换流站将步骤(1)中的有功功率参考值

Figure BDA0000896838450000059
由通讯光纤传输到对侧换流站，即定直流电压侧换流站。Step (2): Determine the active power reference value in step (1) by the converter station on the active power side
Figure BDA0000896838450000059
It is transmitted by the communication optical fiber to the opposite side converter station, that is, the converter station on the fixed DC voltage side.

步骤(3)：定直流电压侧换流站的直流电压控制模块接受直流电压调度指令Udcset，经过直流电压调节环节生成直流电压的参考信号Udcref。生成直流电压的参考信号的逻辑图如图5所示。Step (3): The DC voltage control module of the converter station on the constant DC voltage side accepts the DC voltage scheduling instruction U dcset , and generates a DC voltage reference signal U dcref through the DC voltage adjustment link. The logic diagram for generating the reference signal for the DC voltage is shown in Figure 5.

步骤(4)：定直流电压侧换流站的直流电压控制器接收步骤(2)中的

Figure BDA0000896838450000055
，作为附加控制信号。外环直流电压控制器的逻辑图如图6所示。Step (4): The DC voltage controller of the converter station on the constant DC voltage side receives the
Figure BDA0000896838450000055
, as an additional control signal. The logic diagram of the outer loop DC voltage controller is shown in Figure 6.

步骤(5)：步骤(3)中的Udcref经过有功功率控制器PI环节后产生的控制信号与步骤(4)中的附加控制信号

Figure BDA0000896838450000056
相加，再经过限幅环节及变换环节，生成定直流电压侧的正序d轴电流参考值
Figure BDA0000896838450000051
Step (5): the control signal generated by U dcref in step (3) after passing through the PI link of the active power controller and the additional control signal in step (4)
Figure BDA0000896838450000056
Add, and then go through the limiting link and the transformation link to generate the positive-sequence d-axis current reference value of the constant DC voltage side
Figure BDA0000896838450000051

采用定直流电压控制模式的换流器用于平衡直流系统有功和保持直流侧电压稳定；在忽略R和换流器损耗时，换流器交直流两侧的有功保持平衡，即：The converter with constant DC voltage control mode is used to balance the active power of the DC system and keep the voltage on the DC side stable; when ignoring R and the loss of the converter, the active power on both sides of the converter is kept balanced, that is:

Figure BDA0000896838450000052
Figure BDA0000896838450000052

稳态时：In steady state:

Figure BDA0000896838450000053
Figure BDA0000896838450000053

当VSC交直流两侧的有功不平衡时，将引起直流电压的波动，此时有功电流则将向直流侧电容充电或放电，直至直流电压稳定在设定值；对于定直流电压控制的换流器而言，相当于一个有功平衡节点；在所设计的定直流电压控制器中，直流电压和直流电压指令偏差经PI调节后，与附加控制信号

Figure BDA0000896838450000057
相加后，作为有功电流的参考值
Figure BDA0000896838450000054
When the active power on the AC and DC sides of the VSC is unbalanced, the DC voltage will fluctuate. At this time, the active current will charge or discharge the DC side capacitor until the DC voltage stabilizes at the set value; for the commutation controlled by the constant DC voltage For the controller, it is equivalent to an active power balance node; in the designed constant DC voltage controller, after the DC voltage and DC voltage command deviation are adjusted by PI, they are related to the additional control signal.
Figure BDA0000896838450000057
After addition, as the reference value of the active current
Figure BDA0000896838450000054

本发明还提供一种柔性环网控制器的有功功率控制方法的控制系统，控制系统包括依次进行通讯的定有功功率侧换流站和定直流电压侧换流站；The invention also provides a control system for the active power control method of the flexible ring network controller, the control system includes a constant active power side converter station and a constant DC voltage side converter station that communicate in sequence;

定有功功率控制侧换流站包括依次进行通讯的有功功率控制模块和外环有功功率控制器模块；有功功率控制模块用于接收上级有功功率指令值Pset，生成模块用于生成有功功率参考值Pref；外环有功功率控制器模块根据有功功率参考值Pref生成有功电流参考值

Figure BDA0000896838450000058
。The converter station on the fixed active power control side includes an active power control module and an outer loop active power controller module that communicate in sequence; the active power control module is used to receive the upper-level active power command value P set , and the generation module is used to generate an active power reference value P ref ; the outer loop active power controller module generates an active current reference value according to the active power reference value P ref
Figure BDA0000896838450000058
.

定直流电压侧换流站包括依次通讯的直流电压控制模块(直流电压调节环节(即所述的生成直流电压的参考模块)是直流电压控制模块的一个组成部分)；所述直流电压控制模块用于接收上级直流电压调度指令Udcset；并生成直流电压的参考信号Udcref；The converter station on the constant DC voltage side includes a DC voltage control module that communicates in sequence (the DC voltage regulation link (that is, the reference module for generating the DC voltage) is an integral part of the DC voltage control module); the DC voltage control module uses receiving the upper-level DC voltage scheduling instruction U dcset ; and generating a DC voltage reference signal U dcref ;

本发明基于站间通讯采用在定直流电压侧换流站的直流电压控制器中引入定有功功率侧换流站产生的有功电流参考值作为附加信号的协调控制方法，进而实现传输有功功率的快速调节，仿真结果表明所需的调节时间可缩减至少约30ms。另一方面，在传输功率发生变化的过程中，原控制策略下直流电压产生的波动在±6％～±7％左右，新控制策略下直流电压的波动不会超过±1％。本发明提高了柔性环网控制器系统稳定运行的能力，降低了对设备的要求，提高了技术经济性和安全性。Based on the inter-station communication, the present invention adopts the coordinated control method of introducing the active current reference value generated by the constant active power side converter station as an additional signal in the DC voltage controller of the constant DC voltage side converter station, thereby realizing the rapid transmission of active power. The simulation results show that the required adjustment time can be reduced by at least about 30ms. On the other hand, in the process of changing the transmission power, the fluctuation of the DC voltage under the original control strategy is about ±6% to ±7%, and the fluctuation of the DC voltage under the new control strategy will not exceed ±1%. The invention improves the stable operation capability of the flexible ring network controller system, reduces the requirements for equipment, and improves the technical economy and safety.

以上实施例仅用以说明本发明的技术方案而非对其限制，尽管参照上述实施例对本发明进行了详细的说明，所属领域的普通技术人员依然可以对本发明的具体实施方式进行修改或者等同替换，这些未脱离本发明精神和范围的任何修改或者等同替换，均在申请待批的本发明的权利要求保护范围之内。The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still modify or equivalently replace the specific embodiments of the present invention. , any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention are all within the protection scope of the claims of the present invention for which the application is pending.

Claims (7)

1. A method for active power control of a flexible ring network controller, the method comprising:
(1) generating active current reference value by fixed active power side converter station
Figure FDA0000896838440000011
(2) Determining an active power reference value of an active power side converter station
Figure FDA0000896838440000012
The communication optical fiber is transmitted to an opposite converter station, and the direct-current voltage side converter station is determined at the opposite converter station;
(3) reference signal U for generating direct-current voltage by converter station at fixed direct-current voltage sidedcref；
(4) DC voltage control module reception for a fixed DC voltage side converter station
Figure FDA0000896838440000013
A signal;
(5) generating positive sequence d-axis current reference value by fixed direct-current voltage side converter station
Figure FDA0000896838440000014
2. The active power control method according to claim 1, wherein in the step (1), the active power control module of the fixed active power control side converter station receives an upper-level active power command value PsetActive power command value PsetAnd modulating the active signal P for the purpose of suppressing low frequency oscillations and achieving emergency power supportmGenerating an active power reference value P according to the running state of the alternating current system through an active power regulation linkref_oppDesigning different active instruction adjusting links and upper and lower limit values according to requirements; the outer loop active power controller is based on the active power reference value Pref_oppGenerating an active power current reference value
Figure FDA0000896838440000015
Under the condition of three-phase power grid voltage balance, the direction of a power grid voltage vector Us is a d-axis direction, an outer-loop active power controller is designed, and an active current reference value is generated
Figure FDA0000896838440000016
Figure FDA0000896838440000017
Wherein: u shapes、isdP ac voltage, active current and active power.
3. The active power control method according to claim 1, wherein in the step (3), the dc voltage control module of the fixed dc voltage side converter station receives an upper-level dc voltage scheduling command UdcsetGenerating a reference signal U of a DC voltage through a DC voltage regulation linkdcref(ii) a Different direct current voltage regulation links and upper and lower limit values are designed according to requirements.
4. The active power control method according to claim 1, wherein in the step (4), the dc voltage controller of the fixed dc voltage side converter station receives the active current reference value of the fixed active power side converter station
Figure FDA0000896838440000018
As an additional control signal.
5. The active power control method according to claim 1, wherein in step (5), the reference signal Udcref of the DC voltage is a signal generated after passing through the outer-loop DC voltage controller and an additional control signal
Figure FDA0000896838440000019
Adding the two phases, and generating a positive sequence d-axis current reference value of the converter station at the fixed direct voltage side through a limiting link and a conversion link
Figure FDA00008968384400000110
6. The active power control method according to claim 5, wherein the inverter using the constant dc voltage control mode is used for balancing the dc system active power and keeping the dc side voltage stable; when neglecting R and transverter loss, decide the active power of direct current voltage control mode transverter alternating current-direct current both sides and keep balance, promptly:
Figure FDA00008968384400000111
at steady state:
Figure FDA0000896838440000021
when active power on the AC side and the DC side of the VSC is unbalanced, the fluctuation of DC voltage is caused, and at the moment, the active current charges or discharges a capacitor on the DC side until the DC voltage is stabilized at a set value; for a converter controlled by constant direct current voltage, the converter is equivalent to an active balance node; in the designed constant DC voltage controller, the DC voltage and the DC voltage command deviation are used as the reference value of the active current after being regulated by PI
Figure FDA0000896838440000022
Wherein: u shapes、isd、Pdc、udc、idcAlternating voltage, active current, direct power, direct voltage and direct current, iLIs a direct current in a steady state.
7. A control system of an active power control method of a flexible ring network controller according to any of claims 1-6, characterized in that the control system comprises a fixed active power side converter station and a fixed DC voltage side converter station which are communicated in sequence;
the converter station at the fixed active power control side comprises an active power control module and an outer ring active power controller module which are communicated in sequence; the active power control module is used for receiving a superior active power instruction value PsetThe active power reference value generation module is used for generating an active power reference value Pref(ii) a The outer loop active power controller module is based on the active power reference value PrefGenerating an active current reference value
Figure FDA0000896838440000023
The fixed direct-current voltage side converter station comprises a direct-current voltage control module; the direct-current voltage control module is used for receiving a superior direct-current voltage scheduling instruction Udcset(ii) a And generates a reference signal U of a direct current voltagedcref。
CN201511023217.5A 2015-12-30 2015-12-30 Active power control method and control system of a flexible ring network controller Active CN106936141B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201511023217.5A CN106936141B (en) 2015-12-30 2015-12-30 Active power control method and control system of a flexible ring network controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201511023217.5A CN106936141B (en) 2015-12-30 2015-12-30 Active power control method and control system of a flexible ring network controller

Publications (2)

Publication Number Publication Date
CN106936141A CN106936141A (en) 2017-07-07
CN106936141B true CN106936141B (en) 2020-10-13

Family

ID=59441045

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201511023217.5A Active CN106936141B (en) 2015-12-30 2015-12-30 Active power control method and control system of a flexible ring network controller

Country Status (1)

Country Link
CN (1) CN106936141B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109120016A (en) * 2018-10-26 2019-01-01 贵州电网有限责任公司 A kind of dc power modulated in real time method of the load balancing control based on DDC
CN110492477B (en) * 2019-08-02 2025-08-26 全球能源互联网研究院有限公司 Ring network controller and control method
CN111030157B (en) * 2019-12-17 2026-02-17 南瑞集团有限公司 Flexible direct-current transmission alternating-current side fault ride-through method for connecting active alternating-current system

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0554804A1 (en) * 1992-01-30 1993-08-11 Hitachi, Ltd. Control equipment for high voltage direct current transmission system
CN102751720A (en) * 2012-04-11 2012-10-24 中国电力科学研究院 Flexible high-voltage direct-current (HVDC) load flow computational model and computational method thereof
CN103346571A (en) * 2013-07-17 2013-10-09 深圳供电局有限公司 Microgrid control method and device adapting to power grid requirements
CN103427425A (en) * 2013-08-22 2013-12-04 华北电力大学 Coordinated control device and method for MMC (modular multilevel converter) type unified power quality conditioner
CN104022522A (en) * 2014-06-09 2014-09-03 山东大学 Method for cooperatively controlling multiport flexible DC power transmission system
CN104242333A (en) * 2014-09-19 2014-12-24 华南理工大学 Self-excited starting method for modular multilevel inverter flexible direct current transmission system
CN104505853A (en) * 2015-01-08 2015-04-08 南方电网科学研究院有限责任公司 Power allocation method for multiple constant DC voltage stations in a multi-terminal flexible DC transmission system
CN104600736A (en) * 2015-01-09 2015-05-06 南方电网科学研究院有限责任公司 A flexible direct current transmission active power control mode automatic switching system
CN204333972U (en) * 2015-01-08 2015-05-13 南方电网科学研究院有限责任公司 Multi-terminal flexible DC transmission equipment
CN104901301A (en) * 2014-03-04 2015-09-09 国家电网公司 Coordination control method for multi-terminal flexible DC power transmission system

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0554804A1 (en) * 1992-01-30 1993-08-11 Hitachi, Ltd. Control equipment for high voltage direct current transmission system
CN102751720A (en) * 2012-04-11 2012-10-24 中国电力科学研究院 Flexible high-voltage direct-current (HVDC) load flow computational model and computational method thereof
CN103346571A (en) * 2013-07-17 2013-10-09 深圳供电局有限公司 Microgrid control method and device adapting to power grid requirements
CN103427425A (en) * 2013-08-22 2013-12-04 华北电力大学 Coordinated control device and method for MMC (modular multilevel converter) type unified power quality conditioner
CN104901301A (en) * 2014-03-04 2015-09-09 国家电网公司 Coordination control method for multi-terminal flexible DC power transmission system
CN104022522A (en) * 2014-06-09 2014-09-03 山东大学 Method for cooperatively controlling multiport flexible DC power transmission system
CN104242333A (en) * 2014-09-19 2014-12-24 华南理工大学 Self-excited starting method for modular multilevel inverter flexible direct current transmission system
CN104505853A (en) * 2015-01-08 2015-04-08 南方电网科学研究院有限责任公司 Power allocation method for multiple constant DC voltage stations in a multi-terminal flexible DC transmission system
CN204333972U (en) * 2015-01-08 2015-05-13 南方电网科学研究院有限责任公司 Multi-terminal flexible DC transmission equipment
CN104600736A (en) * 2015-01-09 2015-05-06 南方电网科学研究院有限责任公司 A flexible direct current transmission active power control mode automatic switching system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
《VSC-MTDC并联运行及其电压控制》;管清伟;《中国优秀硕士学位论文全文数据库》;20121031;第1-96页 *

Also Published As

Publication number Publication date
CN106936141A (en) 2017-07-07

Similar Documents

Publication Publication Date Title
CN105552946B (en) Direct-current voltage control method and system of flexible ring network controller
US11509166B2 (en) Microgrid control system and microgrid
CN106410849B (en) Microgrid inverter balance control method based on virtual synchronous generator
CN108521139B (en) A frequency-voltage coordinated control method and device
CN113964858B (en) Three-phase inverter grid-connected control system based on dual synchronization principle
CN110061529B (en) Smooth switching control method of flexible multi-state switch
CN107276083B (en) A kind of alternating current-direct current power grid progress control method towards energy internet
CN104124689B (en) For the flexible direct current active power controller method of hybrid AC/DC power transmission systems
CA3080015A1 (en) Voltage and current control method and device for direct-current transmission system
CN110603704B (en) DC Current Control of HVDC Converter Based on VSC
CN102222937A (en) Photovoltaic grid-connected inverter and grid-connected control method thereof
CN104836455A (en) Power distribution network power electronic transformer and control method thereof
CN105552948B (en) A power grid frequency regulation method based on flexible DC transmission system
CN104868762B (en) A kind of electric power electric transformer and its control method of scattered energy storage
CN109327036B (en) A cascaded energy storage system and control method for improving power quality of power grid
CN106936141B (en) Active power control method and control system of a flexible ring network controller
CN106786562B (en) A kind of the self-excitation activation system and method for static synchronous series compensator
CN106160023A (en) A kind of Hybrid HVDC receiving end weak mains frequency cooperative control method
CN114825367A (en) Control method for islanding operation of flexible direct current transmission system
CN106921170A (en) A kind of multiple-variable flow type three-phase imbalance load integrated control structure and control strategy
CN110148954B (en) A SOP-Based Distribution Network Control Method
CN107947623B (en) A multi-mode autonomous operation control method for bidirectional AC/DC converter under unbalanced load conditions
CN204835940U (en) Power electronic transformer of dispersion energy storage
CN105576718B (en) Alternating current-direct current distribution source lotus optimization distribution control method under a kind of distributed new high permeability situation
CN109298255A (en) A kind of subway energy feedback current transformer power examination test system and method

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant