连接低惯量系统的VSC-MTDC的自适应下垂控制
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摘要
对于连接低惯量交流系统的多端柔性直流输电(VSC-MTDC)系统,当系统发生大扰动时会造成频率变化,为了给交流系统提供虚拟惯量,在换流器控制系统中加入P-?下垂控制;为了进一步抑制频率波动,设计VSC-MTDC系统的自适应下垂控制,可以在更大程度上利用换流器容量,快速调节有功平衡,减小直流电压波动。在PSCAD/EMTDC仿真软件中建立三端模型,对比分析主从控制、下垂控制和自适应下垂控制对交流系统频率和直流电压的影响。仿真结果表明,加入了P-?下垂控制可以有效抑制交流系统频率变化,采用自适应下垂控制可以增强抑制的效果,减小直流电压波动,提高系统稳定性。
As for the VSC-MTDC( Voltage Source Converter based Multi-Terminal Direct Current) system connected to low inertia AC system,the frequency of the system may fluctuate when large disturbances happen. Therefore,the P-? droop control is introduced in the converter control to supply virtual inertia for AC system. In order to further suppress the frequency fluctuation,an adaptive droop control for VSC-MTDC is designed. This control method can take advantages of converter capacity to a large extent,adjust active power quickly and reduce DC voltage variation.Additionally,a three-terminal model is built in the PSCAD/EMTDC software to compare and analyze the impacts on frequency and DC voltage of master-slave control,P-? droop control and adaptive droop control. The simulative results show that the droop control based on P-? curve can suppress the frequency fluctuation effectively and the adaptive droop control can reinforce the suppression effect and decrease the voltage variation so as to improve the power system stability.
As for the VSC-MTDC( Voltage Source Converter based Multi-Terminal Direct Current) system connected to low inertia AC system,the frequency of the system may fluctuate when large disturbances happen. Therefore,the P-? droop control is introduced in the converter control to supply virtual inertia for AC system. In order to further suppress the frequency fluctuation,an adaptive droop control for VSC-MTDC is designed. This control method can take advantages of converter capacity to a large extent,adjust active power quickly and reduce DC voltage variation.Additionally,a three-terminal model is built in the PSCAD/EMTDC software to compare and analyze the impacts on frequency and DC voltage of master-slave control,P-? droop control and adaptive droop control. The simulative results show that the droop control based on P-? curve can suppress the frequency fluctuation effectively and the adaptive droop control can reinforce the suppression effect and decrease the voltage variation so as to improve the power system stability.
引文
[1]李宇骏,杨勇,李颖毅,等.提高电力系统惯性水平的风电场和VSC-HVDC协同控制策略[J].中国电机工程学报,2014,34(34):6021-6031.LI Yujun,YANG Yong,LI Yingyi,et al. Coordinated control of wind farms and VSC-HVDC to improve inertia level of power system[J].Proceedings of the CSEE,2014,34(34):6021-6031.
[2]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):130-136.FU Yuan,WANG Yi,ZHANG Xiangyu,et al. Coordinated power control of VSC-MTDC system[J]. Electric Power Automation Equipment,2014,34(9):130-136.
[3]陈谦,唐国庆,潘诗锋.采用多点直流电压控制方式的VSC多端直流输电系统[J].电力自动化设备,2004,24(5):10-15.CHEN Qian,TANG Guoqing,PAN Shifeng. VSC-MTDC using multiterminal DC voltage control scheme[J]. Electric Power Automation Equipment,2004,24(5):10-15.
[4]刘瑜超,武健,刘怀远,等.基于自适应下垂调节的VSC-MTDC功率协调控制[J].中国电机工程学报,2016,36(1):40-48.LIU Yuchao,WU Jian,LIU Huaiyuan,et al. Effective power sharing based on adaptive droop control method in VSC multi-terminal DC grids[J]. Proceedings of the CSEE,2016,36(1):40-48.
[5]张武其,吕洋.向弱电网供电的VSC-HVDC系统的模拟惯量控制策略研究[J].电力系统保护与控制,2016,44(6):104-110.ZHANG Wuqi,LYang. Emulation inertia control strategy for VSCHVDC supplying weak network[J]. Power System Protection and Control,2016,44(6):104-110.
[6]ZHU J,BOOTH C D,ADAM G P,et al. Inertia emulation control strategy for VSC-HVDC transmission systems[J]. IEEE Transactions on Power Systems,2013,28(2):1277-1287.
[7]鲍正杰,李生虎.基于VSC-HVDC有功支援和自适应低频减载的区域电网频率控制[J].电力系统保护与控制,2014,42(20):32-37.BAO Zhengjie,LI Shenghu. Frequency control for regional system based on active power support from VSC-HVDC and adaptive under-frequency load shedding[J]. Power System Protection and Control,2014,42(20):32-37.
[8]CASTRO L M,ACHA E. On the provision of frequency regulation in low inertia AC grids using HVDC systems[J]. IEEE Transactions on Smart Grid,2016,7(6):2680-2690.
[9]罗永捷,李耀华,王平,等.多端柔性直流输电系统直流电压自适应下垂控制策略研究[J].中国电机工程学报,2016,36(10):2588-2599.LUO Yongjie,LI Yaohua,WANG Ping,et al. DC voltage adaptive droop control of multi-terminal HVDC systems[J]. Proceedings of the CSEE,2016,36(10):2588-2599.
[10]韩民晓,许冬,万磊.基于一致性算法的混合多端直流自律分散控制[J].电力系统自动化,2016,40(12):130-136.HAN Minxiao,XU Dong,WAN Lei. Consenus algorithm based decentralized autonomous control of hybrid multi-terminal direct current system[J]. Automation of Electric Power Systems,2016,40(12):130-136.
[11]喻锋,王西田,解大.多端柔性直流下垂控制的功率参考值修正方法[J].电力自动化设备,2015,35(11):117-122.YU Feng,WANG Xitian,XIE Da. Power reference correction method for droop control of VSC-MTDC system[J]. Electric Power Automation Equipment,2015,35(11):117-122.
[12]冉晓洪,苗世洪,吴英杰,等.基于最优功率分配的多端直流网络改进下垂控制策略[J].电工技术学报,2016,31(9):16-24.RAN Xiaohong,MIAO Shihong,WU Yingjie,et al. An improved droop control strategy for multi-terminal DC grids based on optimal active power allocation[J]. Transactions of China ElectrotechnicalSociety,2016,31(9):16-24.
[13]杨文博,宋强,朱喆,等.基于直流内电势控制的MMC多端直流输电系统最优下垂控制[J].电力自动化设备,2016,36(10):51-59.YANG Wenbo,SONG Qiang,ZHU Zhe,et al. Optimal droop control based on direct DC internal potential control for MMC-MTDC system[J]. Electric Power Automation Equipment,2016,36(10):51-59.
[14]李文勋,车延博,洪潮,等.考虑输电损耗和新能源波动的VSCMTDC下垂控制策略[J].电力自动化设备,2017,37(8):220-226.LI Wenxun,CHE Yanbo,HONG Chao,et al. VSC-MTDC droop control strategy considering transmission loss and renewable energy fluctuation[J]. Electric Power Automation Equipment,2017,37(8):220-226.
[15]VRANA T K,BEERTEN J,BELMANS R,et al. A classification of DC node voltage control methods for HVDC grids[J]. Electric power systems research,2013,103:137-144.
[2]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):130-136.FU Yuan,WANG Yi,ZHANG Xiangyu,et al. Coordinated power control of VSC-MTDC system[J]. Electric Power Automation Equipment,2014,34(9):130-136.
[3]陈谦,唐国庆,潘诗锋.采用多点直流电压控制方式的VSC多端直流输电系统[J].电力自动化设备,2004,24(5):10-15.CHEN Qian,TANG Guoqing,PAN Shifeng. VSC-MTDC using multiterminal DC voltage control scheme[J]. Electric Power Automation Equipment,2004,24(5):10-15.
[4]刘瑜超,武健,刘怀远,等.基于自适应下垂调节的VSC-MTDC功率协调控制[J].中国电机工程学报,2016,36(1):40-48.LIU Yuchao,WU Jian,LIU Huaiyuan,et al. Effective power sharing based on adaptive droop control method in VSC multi-terminal DC grids[J]. Proceedings of the CSEE,2016,36(1):40-48.
[5]张武其,吕洋.向弱电网供电的VSC-HVDC系统的模拟惯量控制策略研究[J].电力系统保护与控制,2016,44(6):104-110.ZHANG Wuqi,LYang. Emulation inertia control strategy for VSCHVDC supplying weak network[J]. Power System Protection and Control,2016,44(6):104-110.
[6]ZHU J,BOOTH C D,ADAM G P,et al. Inertia emulation control strategy for VSC-HVDC transmission systems[J]. IEEE Transactions on Power Systems,2013,28(2):1277-1287.
[7]鲍正杰,李生虎.基于VSC-HVDC有功支援和自适应低频减载的区域电网频率控制[J].电力系统保护与控制,2014,42(20):32-37.BAO Zhengjie,LI Shenghu. Frequency control for regional system based on active power support from VSC-HVDC and adaptive under-frequency load shedding[J]. Power System Protection and Control,2014,42(20):32-37.
[8]CASTRO L M,ACHA E. On the provision of frequency regulation in low inertia AC grids using HVDC systems[J]. IEEE Transactions on Smart Grid,2016,7(6):2680-2690.
[9]罗永捷,李耀华,王平,等.多端柔性直流输电系统直流电压自适应下垂控制策略研究[J].中国电机工程学报,2016,36(10):2588-2599.LUO Yongjie,LI Yaohua,WANG Ping,et al. DC voltage adaptive droop control of multi-terminal HVDC systems[J]. Proceedings of the CSEE,2016,36(10):2588-2599.
[10]韩民晓,许冬,万磊.基于一致性算法的混合多端直流自律分散控制[J].电力系统自动化,2016,40(12):130-136.HAN Minxiao,XU Dong,WAN Lei. Consenus algorithm based decentralized autonomous control of hybrid multi-terminal direct current system[J]. Automation of Electric Power Systems,2016,40(12):130-136.
[11]喻锋,王西田,解大.多端柔性直流下垂控制的功率参考值修正方法[J].电力自动化设备,2015,35(11):117-122.YU Feng,WANG Xitian,XIE Da. Power reference correction method for droop control of VSC-MTDC system[J]. Electric Power Automation Equipment,2015,35(11):117-122.
[12]冉晓洪,苗世洪,吴英杰,等.基于最优功率分配的多端直流网络改进下垂控制策略[J].电工技术学报,2016,31(9):16-24.RAN Xiaohong,MIAO Shihong,WU Yingjie,et al. An improved droop control strategy for multi-terminal DC grids based on optimal active power allocation[J]. Transactions of China ElectrotechnicalSociety,2016,31(9):16-24.
[13]杨文博,宋强,朱喆,等.基于直流内电势控制的MMC多端直流输电系统最优下垂控制[J].电力自动化设备,2016,36(10):51-59.YANG Wenbo,SONG Qiang,ZHU Zhe,et al. Optimal droop control based on direct DC internal potential control for MMC-MTDC system[J]. Electric Power Automation Equipment,2016,36(10):51-59.
[14]李文勋,车延博,洪潮,等.考虑输电损耗和新能源波动的VSCMTDC下垂控制策略[J].电力自动化设备,2017,37(8):220-226.LI Wenxun,CHE Yanbo,HONG Chao,et al. VSC-MTDC droop control strategy considering transmission loss and renewable energy fluctuation[J]. Electric Power Automation Equipment,2017,37(8):220-226.
[15]VRANA T K,BEERTEN J,BELMANS R,et al. A classification of DC node voltage control methods for HVDC grids[J]. Electric power systems research,2013,103:137-144.