多端柔性直流输电系统的功率协调控制策略
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摘要
维持直流电压稳定是确保整个多端柔性直流输电系统稳定运行的重要前提,基于此,提出在单点或多点定直流电压控制换流站控制中引入二次功率协调控制,获得一种适用于两端或多端柔性直流输电系统的功率协调控制策略。所提控制策略可实现多点定直流电压控制换流站根据各换流站的容量以及运维人员的设定合理分配功率,消除因负荷功率变化引起的直流电压偏移,以及直流侧线路电阻对各换流站功率分配精度的影响问题。最后,在PSCAD/EMTDC中以一个三端柔性直流输电系统为例进行仿真,验证了所提控制策略的有效性和正确性。
Maintaining stability of DC voltage is an important precondition to ensure stable operation of the multi-terminal VSC-HVDC system, therefore, this paper proposes to introduce secondary power coordinated control in control of the single point or multiple constant point DC voltage control converter stations so as to obtain a kind of power coordinated control strategy for the bi-terminal or multi-terminal VSC-HVDC system. It has proved the proposed strategy is able to reasonably distribute power according setting of capacities of converter stations and operation and maintenance personnel, remove DV voltage deviation caused by load power variation and influence of resistance of DC transmission lines on power distribution precision of the converter stations. Finally, it verifies effectiveness and correctness of the propose strategy by using a three-terminal VSC-HVDC system for simulation in PSCAD/EMTDC.
Maintaining stability of DC voltage is an important precondition to ensure stable operation of the multi-terminal VSC-HVDC system, therefore, this paper proposes to introduce secondary power coordinated control in control of the single point or multiple constant point DC voltage control converter stations so as to obtain a kind of power coordinated control strategy for the bi-terminal or multi-terminal VSC-HVDC system. It has proved the proposed strategy is able to reasonably distribute power according setting of capacities of converter stations and operation and maintenance personnel, remove DV voltage deviation caused by load power variation and influence of resistance of DC transmission lines on power distribution precision of the converter stations. Finally, it verifies effectiveness and correctness of the propose strategy by using a three-terminal VSC-HVDC system for simulation in PSCAD/EMTDC.
引文
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[10]闵睿,蓝海波,翟丙旭,等.张北柔直电网运行协调控制关键技术及控制策略探讨[J].华北电力技术,2017(11):44-48.MIN Rui,LAN Haibo,ZHAI Binxu,et al.Key technologies of control and protection and operation coordination control strategy for Zhangbei VSC-HVDC[J].North China Electric Power,2017(11):44-48.
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[12]付媛,王毅,张祥宇,等.多端电压源型直流系统的功率协调控制技术[J].电力自动化设备,2014,34(9):130-135.FU Yuan,WANG Yi,ZHANG Xiangyu,et al.Coordinated power control of VSC-MTDC system[J].Electric Power Automation Equipment,2014,34(9):130-135.
[13]张祥.多端柔性直流输电系统的协调控制与优化运行研究[D].广州:华南理工大学,2016.
[14]任明辉.多端柔性直流输电系统协调控制方法研究[D].成都:电子科技大学,2017.
[15]胡兆庆,董云龙,王佳成,等.高压柔性直流电网多端控制系统架构和控制策略[J].全球能源互联网,2018,1(4):461-470.HU Zhaoqing,DONG Yunlong,WANG Jiacheng,et al.Flexible DC grid multi-terminal control and protection system framework and control strategy[J].Journal of Global Energy Interconnection,2018,1(4):461-470.
[16]刘自伟.含柔性直流的交直流混合输电网运行特性研究[D].重庆:重庆大学,2017.
[17]李海峰.基于MMC的柔性直流电网协调控制策略研究[D].北京:华北电力大学,2017.
[18]刘文涛.模块化多电平直流输电调节方式及控制策略研究[D].合肥:合肥工业大学,2012.
[19]刘永庆.直流配电网中多换流器的电压协同控制策略研究[D].北京:华北电力大学,2017.
[20]徐政,张哲任,刘高任.柔性直流输电网的电压控制原理研究[J].电力工程技术,2017,36(1):54-59.XU Zheng,ZHANG Zheren,LIU Gaoren.Research of the voltage control principle of VSC-HVDC transmission grid[J].Electric Power Engineering Technology,2017,36(1):54-59.
[21]彭发喜.柔性直流电网控制和保护策略研究[D].杭州:浙江大学,2017.
[2]蔡新雷.广东南澳多端柔性直流输电系统调度运行策略探讨[J].广东电力,2016,29(7):93-96,110.CAI Xinlei.Discussion on dispatching operation strategy for Guangdong Nanao VSC-MTDC transmission system[J].Guangdong Electric Power,2016,29(7):93-96,110.
[3]黄娟娟,李泰军,田昕,等.雅中江西±800 kV特高压直流工程受端换流站容性无功配置研究[J].广东电力,2016,29(11):64-69.HUANG Juanjuan,LI Taijun,TIAN Xin,et al.Capacitive reactive power compensation in receiving-end converter station of Yazhong-Jiangxi±800 kV ultra-highvoltage direct current transmission project[J].Guangdong Electric Power,2016,29(11):64-69.
[4]张明.多端柔性直流电网保护及稳定控制研究[D].北京:北京交通大学,2018.
[5]董云龙,胡兆庆,田杰,等.多端柔性直流控制保护系统架构和策略[J].南方能源建设,2016,3(2):21-26.DONG Yunlong,HU Zhaoqing,TIAN Jie,et al.Frame of control protection system and control strategy implement in multi-terminal VSC-HVDC system[J].Southern Energy Construction,2016,3(2):21-26.
[6]吴学光,刘昕,林畅,等.大规模多节点柔性直流控制保护仿真测试方法研究[J].电网技术,2017(10):41-50.WU Xueguang,LIU Xin,LIN Chang,et al.Research on modelling and testing methods of large-scale VSC-HVDCcontrol and protection system[J].Power System Technology,2017(10):41-50.
[7]史卓.多端柔性直流系统运行及控制参数优化研究[D].北京:华北电力大学,2017.
[8]BIANCHI F D,GOMISBELLMUNT O.Droop control design for multi-terminal VSC-HVDC grids based on LMIoptimization[C]//Decision&Control&European Control Conference.Piscataway:IEEE,2011:4823-4828.
[9]周瑜,吴滨,唐伟俊,等.含大规模风、光电场的多端柔性直流输电系统控制与建模仿真[J].上海节能,2017(11):25-35.ZHOU Yu,WU Bin,TANG Weijun,et al.Control and simulation of Multi Terminal flexible DC power transmission system at large scale wind solar power farm[J].Shanghai Energy Conservation,2017(11):25-35.
[10]闵睿,蓝海波,翟丙旭,等.张北柔直电网运行协调控制关键技术及控制策略探讨[J].华北电力技术,2017(11):44-48.MIN Rui,LAN Haibo,ZHAI Binxu,et al.Key technologies of control and protection and operation coordination control strategy for Zhangbei VSC-HVDC[J].North China Electric Power,2017(11):44-48.
[11]刘龙龙.基于电压源型换流器的多端直流输电系统控制策略研究[D].北京:北京交通大学,2015.
[12]付媛,王毅,张祥宇,等.多端电压源型直流系统的功率协调控制技术[J].电力自动化设备,2014,34(9):130-135.FU Yuan,WANG Yi,ZHANG Xiangyu,et al.Coordinated power control of VSC-MTDC system[J].Electric Power Automation Equipment,2014,34(9):130-135.
[13]张祥.多端柔性直流输电系统的协调控制与优化运行研究[D].广州:华南理工大学,2016.
[14]任明辉.多端柔性直流输电系统协调控制方法研究[D].成都:电子科技大学,2017.
[15]胡兆庆,董云龙,王佳成,等.高压柔性直流电网多端控制系统架构和控制策略[J].全球能源互联网,2018,1(4):461-470.HU Zhaoqing,DONG Yunlong,WANG Jiacheng,et al.Flexible DC grid multi-terminal control and protection system framework and control strategy[J].Journal of Global Energy Interconnection,2018,1(4):461-470.
[16]刘自伟.含柔性直流的交直流混合输电网运行特性研究[D].重庆:重庆大学,2017.
[17]李海峰.基于MMC的柔性直流电网协调控制策略研究[D].北京:华北电力大学,2017.
[18]刘文涛.模块化多电平直流输电调节方式及控制策略研究[D].合肥:合肥工业大学,2012.
[19]刘永庆.直流配电网中多换流器的电压协同控制策略研究[D].北京:华北电力大学,2017.
[20]徐政,张哲任,刘高任.柔性直流输电网的电压控制原理研究[J].电力工程技术,2017,36(1):54-59.XU Zheng,ZHANG Zheren,LIU Gaoren.Research of the voltage control principle of VSC-HVDC transmission grid[J].Electric Power Engineering Technology,2017,36(1):54-59.
[21]彭发喜.柔性直流电网控制和保护策略研究[D].杭州:浙江大学,2017.