电网电压不平衡条件下混合无功补偿系统分层协调控制策略
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摘要
为实现低压配电网低成本大容量动态连续无功补偿,提出了一种晶闸管投切电容器(TSC)与静止无功发生器(SVG)协同运行的混合无功补偿系统。系统综合了TSC低成本大容量的无功补偿和SVG动态连续无功补偿的优点。在分析其基本原理的基础上,提出混合无功补偿系统分层协调控制策略,消除TSC与SVG由于响应速度的差别对其混合无功补偿性能的影响。针对混合无功补偿系统在电网电压不平衡条件下的安全运行问题,研究了SVG的正负序双环叠加控制策略,使其在具有动态无功补偿性能的同时能抑制一定程度的不平衡电压,保证系统的安全稳定运行。最后,仿真验证了所提控制策略的正确性。
In order to realize reactive power compensation of low voltage distribution network with low cost,large capacity and dynamic continuity,a hybrid reactive compensation system based on thyristor switched capacitor (TSC) and static var generator (SVG) is proposed in this paper. The advantages of TSC with low cost and large capacity reactive power compensation and SVG with dynamic continuous reactive power compensation are combined in this system. Based on the analysis of its basic principles,a hierarchical coordination control strategy is proposed to eliminate the influence of TSC and SVG on its hybrid reactive compensation performance because of the differences in response speed. Aiming at the safe operation of hybrid reactive compensation system under unbalance grid voltage,the control strategy of double-loop superposition of positive and negative sequence of SVG is studied,which is featured with dynamic reactive power compensation performance,so that a certain degree of unbalance voltage can be suppressed to ensure the safe and stable operation of the system. Finally,the correctness of the proposed control strategy is verified through simulation.
In order to realize reactive power compensation of low voltage distribution network with low cost,large capacity and dynamic continuity,a hybrid reactive compensation system based on thyristor switched capacitor (TSC) and static var generator (SVG) is proposed in this paper. The advantages of TSC with low cost and large capacity reactive power compensation and SVG with dynamic continuous reactive power compensation are combined in this system. Based on the analysis of its basic principles,a hierarchical coordination control strategy is proposed to eliminate the influence of TSC and SVG on its hybrid reactive compensation performance because of the differences in response speed. Aiming at the safe operation of hybrid reactive compensation system under unbalance grid voltage,the control strategy of double-loop superposition of positive and negative sequence of SVG is studied,which is featured with dynamic reactive power compensation performance,so that a certain degree of unbalance voltage can be suppressed to ensure the safe and stable operation of the system. Finally,the correctness of the proposed control strategy is verified through simulation.
引文
[1]王兆安.谐波抑制和无功功率补偿.第3版[M].北京:机械工业出版社,2016.
[2]Liu Y W,Rau S H,Wu C J,et al.Improvement of Power Quality by using Advanced Reactive Power Compensation[J].IEEE Transactions on Industry Applications,2017,(99):1.
[3]袁佳歆,陈柏超,万黎,等.利用配电网静止无功补偿器改善配电网电能质量的方法[J].电网技术,2004,28(19):81-84.Yuan Jiaxin,Chen Baichao,Wan Li,et al.The Method to Improve Power Quality of Distribution System by Distribution Static Compensator[J].Power System Technology,2004,28(19):81-84.
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[5]曹一家,陶佳,王光增,等.FACTS控制器间交互影响及协调控制研究进展[J].电力系统及其自动化学报,2008,20(1):1-8.Cao Yijia,Tao Jia,Wang Guangzeng et al.Research Progress on Interaction and Coordinated Control Among FACTS Controllers[J].Proceedings of the CSU-EPSA,2008,20(1):1-8.
[6]赵伟,罗安,唐杰,等.静止无功发生器与晶闸管投切电容器协同运行混合无功补偿系统[J].中国电机工程学报,2009,(19):92-98.Zhao Wei,Luo An,Tang Jie,et al.Hybrid Var Compensator Based on the Coordinated Operation of STATCOM and TSC[J].Proceedings of the CSEE,2009,(19):92-98.
[7]李强,罗安,刘秋英.TSC-DSTATCOM混合型动态无功补偿器及其混杂控制方法[J].电力系统及其自动化学报,2009,21(4):12-19.Li Qiang,Luo An,Liu Qiuying.Hybrid Dynamic Var Compensator Based on TSC-DSTATCOM and its Hybrid Control Method[J].Proceedings of the CSEE,2009,21(4):12-19.
[8]魏承志,涂春鸣,罗安,等.大容量混合无功补偿装置协调控制的研究[J].电力电子技术,2010,44(6):85-87.Wei Chengzhi,Tu Chunming,Luo An,et al.The Research of Coordination Control Strategy in Large-capacity Hybrid Reactive Power Compensation Device[J].Power Electronics,2010,44(6):85-87.
[9]王思宇.组合式无功补偿控制策略研究[D].哈尔滨:哈尔滨工业大学,2013.
[10]Wei T,Mao C,Lu J,et al.Low cost hybrid reactive power compensator using coordination control strategies[J].Iet Generation Transmission&Distribution,2016,10(8):1805-1814.
[11]李旷,刘进军,魏标,等.静止无功发生器补偿电网电压不平衡的控制及其优化方法[J].中国电机工程学报,2006,26(5):58-63.Li Kuang,Liu Jinjun,Wei Biao,et al.Control and Optimization of Static var Generator for Grid Voltage Unbalance Mitigation[J].Proceedings of the CSEE,2006,26(5):58-63.
[12]罗安,欧剑波,唐杰,等.补偿配电网电压不平衡的静止同步补偿器控制方法研究[J].中国电机工程学报,2009,(6):55-60.Luo An,Ou Jianbo,Tan Jie,et al.Research on Control Method of STATCOM for Grid Voltage Unbalance Compensation[J].Proceedings of the CSEE,2009,(6):55-60.
[13]杨达亮,路耕,吴宁.具有无功补偿功能的单相并网变流器矢量控制方法[J].电测与仪表,2018,55(6):96-100.Yang Daliang,Lu Geng,Wu Ning.Vector control method of singlephase grid-connected converter with reactive power compensation[J].E-lectrical Measurement&Instrumentation,2018,55(6):96-100.
[14]张兴,张崇巍.PWM整流器及其控制[M].北京:机械工业出版社,2012.
[2]Liu Y W,Rau S H,Wu C J,et al.Improvement of Power Quality by using Advanced Reactive Power Compensation[J].IEEE Transactions on Industry Applications,2017,(99):1.
[3]袁佳歆,陈柏超,万黎,等.利用配电网静止无功补偿器改善配电网电能质量的方法[J].电网技术,2004,28(19):81-84.Yuan Jiaxin,Chen Baichao,Wan Li,et al.The Method to Improve Power Quality of Distribution System by Distribution Static Compensator[J].Power System Technology,2004,28(19):81-84.
[4]Chugh T,Singh A.Reactive power compensation using D-STATCOM with fuzzy logic supervision[C]//IEEE International Conference on Power Electronics,Intelligent Control and Energy Systems.IEEE,2017:1-6.
[5]曹一家,陶佳,王光增,等.FACTS控制器间交互影响及协调控制研究进展[J].电力系统及其自动化学报,2008,20(1):1-8.Cao Yijia,Tao Jia,Wang Guangzeng et al.Research Progress on Interaction and Coordinated Control Among FACTS Controllers[J].Proceedings of the CSU-EPSA,2008,20(1):1-8.
[6]赵伟,罗安,唐杰,等.静止无功发生器与晶闸管投切电容器协同运行混合无功补偿系统[J].中国电机工程学报,2009,(19):92-98.Zhao Wei,Luo An,Tang Jie,et al.Hybrid Var Compensator Based on the Coordinated Operation of STATCOM and TSC[J].Proceedings of the CSEE,2009,(19):92-98.
[7]李强,罗安,刘秋英.TSC-DSTATCOM混合型动态无功补偿器及其混杂控制方法[J].电力系统及其自动化学报,2009,21(4):12-19.Li Qiang,Luo An,Liu Qiuying.Hybrid Dynamic Var Compensator Based on TSC-DSTATCOM and its Hybrid Control Method[J].Proceedings of the CSEE,2009,21(4):12-19.
[8]魏承志,涂春鸣,罗安,等.大容量混合无功补偿装置协调控制的研究[J].电力电子技术,2010,44(6):85-87.Wei Chengzhi,Tu Chunming,Luo An,et al.The Research of Coordination Control Strategy in Large-capacity Hybrid Reactive Power Compensation Device[J].Power Electronics,2010,44(6):85-87.
[9]王思宇.组合式无功补偿控制策略研究[D].哈尔滨:哈尔滨工业大学,2013.
[10]Wei T,Mao C,Lu J,et al.Low cost hybrid reactive power compensator using coordination control strategies[J].Iet Generation Transmission&Distribution,2016,10(8):1805-1814.
[11]李旷,刘进军,魏标,等.静止无功发生器补偿电网电压不平衡的控制及其优化方法[J].中国电机工程学报,2006,26(5):58-63.Li Kuang,Liu Jinjun,Wei Biao,et al.Control and Optimization of Static var Generator for Grid Voltage Unbalance Mitigation[J].Proceedings of the CSEE,2006,26(5):58-63.
[12]罗安,欧剑波,唐杰,等.补偿配电网电压不平衡的静止同步补偿器控制方法研究[J].中国电机工程学报,2009,(6):55-60.Luo An,Ou Jianbo,Tan Jie,et al.Research on Control Method of STATCOM for Grid Voltage Unbalance Compensation[J].Proceedings of the CSEE,2009,(6):55-60.
[13]杨达亮,路耕,吴宁.具有无功补偿功能的单相并网变流器矢量控制方法[J].电测与仪表,2018,55(6):96-100.Yang Daliang,Lu Geng,Wu Ning.Vector control method of singlephase grid-connected converter with reactive power compensation[J].E-lectrical Measurement&Instrumentation,2018,55(6):96-100.
[14]张兴,张崇巍.PWM整流器及其控制[M].北京:机械工业出版社,2012.