应用于大规模新能源并网的MMC-MTDC双因子自适应下垂控制策略
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摘要
该文提出一种应用于大规模新能源并网的多端柔性直流输电系统双因子自适应下垂控制策略。针对传统下垂控制电压质量低、功率分配特性差等问题,由本地电气量,引入线路阻抗影响因子、功率影响因子,使换流站P-V特性曲线向最优功率分配方向逼近,并给出参数整定原则及逼近效果衰弱证明。在PSCAD/EMTDC中建立模拟风电场应用的四端柔性直流输电系统仿真模型,算例分析和稳暂态仿真结果表明,所提策略可根据运行工况,灵活调整下垂系数,在提高直流电压质量的同时,减少线路损耗。
In this paper, a dual factor adaptive droop control strategy for multi-terminal high voltage DC transmission system for large-scale renewable energy integration was proposed. In order to solve the problems of low voltage quality and poor power distribution characteristic in traditional voltage droop control strategy, the influence factors of power and line impedance were introduced to make the P-V characteristic curve of GSC approach to the optimal power distribution direction. The principle of parameter setting and the decay proof of the approximation effect were given. Finally, a four terminal HVDC simulation model for wind farm application was established in PSCAD/EMTDC. Example analysis and simulation results of both steady and transient states show that the MTDC system based on the adaptive droop control strategy can adjust the droop coefficients flexibly according to the operation conditions, and has the advantages of high voltage quality and low line loss.
In this paper, a dual factor adaptive droop control strategy for multi-terminal high voltage DC transmission system for large-scale renewable energy integration was proposed. In order to solve the problems of low voltage quality and poor power distribution characteristic in traditional voltage droop control strategy, the influence factors of power and line impedance were introduced to make the P-V characteristic curve of GSC approach to the optimal power distribution direction. The principle of parameter setting and the decay proof of the approximation effect were given. Finally, a four terminal HVDC simulation model for wind farm application was established in PSCAD/EMTDC. Example analysis and simulation results of both steady and transient states show that the MTDC system based on the adaptive droop control strategy can adjust the droop coefficients flexibly according to the operation conditions, and has the advantages of high voltage quality and low line loss.
引文
[1]张文亮,汤涌,曾南超.多端高压直流输电技术及应用前景[J].电网技术,2010,34(9):1-6.Zhang Wenliang,Tang Yong,Zeng Nanchao.Multi-terminal HVDC transmission technologies and its application prospects in China[J].Power System Technology,2010,34(9):1-6(in Chinese).
[2]姚良忠,吴婧,王志冰,等.未来高压直流电网发展形态分析[J].中国电机工程学报,2014,34(34):6007-6020.Yao Liangzhong,Wu Jing,Wang Zhibing,et al.Pattern analysis of future HVDC grid development[J].Proceedings of the CSEE,2014,34(34):6007-6020(in Chinese).
[3]Debnath S,Qin Jingchao,Bahrani B,et al.Operation,control,and applications of the modular multilevel converter:a review[J].IEEE Transactions on Power Electronics,2015,30(1):37-53.
[4]Nami A,Liang Jiaqi,Dijkhuizen F,et al.Modular multilevel converters for HVDC applications:review on converter cells and functionalities[J].IEEE Transactions on Power Electronics,2015,30(1):18-36.
[5]杨晓峰,郑琼林,薛尧,等.模块化多电平换流器的拓扑和工业应用综述[J].电网技术,2016,40(1):1-10.Yang Xiaofeng,Zheng Qionglin,Xue Yao,et al.Review on topology and industry applications of modular multilevel converter[J].Power System Technology,2016,40(1):1-10(in Chinese).
[6]汤广福,罗湘,魏晓光.多端直流输电与直流电网技术[J].中国电机工程学报,2013,33(10):8-17.Tang Guangfu,Luo Xiang,Wei Xiaoguang.Multi-terminal HVDC and DC-grid technology[J].Proceedings of the CSEE,2013,33(10):8-17(in Chinese).
[7]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 VSCmulti-terminal DC grids[J].Proceedings of the CSEE,2016,36(1):40-48(in Chinese).
[8]Sakamoto K,Yajima M,Ishikawa T,et al.Development of a control system for a high-performance selfcommutated AC/DC converter[J].IEEE Transactions on Power Delivery,1998,13(1):225-232.
[9]Johnson B K,Lasseter R H,Alvarado F L,et al.Expandable multiterminal DC systems based on voltage droop[J].IEEE Transactions on Power Delivery,1993,8(4):1926-1932.
[10]Haileselassie T M,Uhlen K.Impact of DC line voltage drops on power flow of MTDC using droop control[J].IEEE Transactions on Power Systems,2012,27(3):1441-1449.
[11]Xiao Liang,Xu Zheng,An Ting,et al.Improved analytical model for the study of steady state performance of droop-controlled VSC-MTDC systems[J].IEEETransactions on Power Systems,2017,32(3):2083-20983.
[12]吴金龙,刘欣和,王先为,等.多端柔性直流输电系统直流电压混合控制策略[J].电网技术,2015,39(6):1593-1599.Wu Jinlong,Liu Xinhe,Wang Xianwei,et al.Research of DC voltage hybrid control strategy for VSC-MTDCsystem[J].Power System Technology,2015,39(6):1593-1599(in Chinese).
[13]阎发友,汤广福,贺之渊,等.基于MMC的多端柔性直流输电系统改进下垂控制策略[J].中国电机工程学报,2014,34(3):397-404.Yan Fayou,Tang Guangfu,He Zhiyuan,et al.An improved droop control strategy for MMC-based VSC-MTDC systems[J].Proceedings of the CSEE,2014,34(3):397-404(in Chinese).
[14]Wang Weiyu,Li Yong,Cao Yijin,et al.Adaptive droop control of VSC-MTDC system for frequency support and power sharing[J].IEEE Transactions on Power Systems,2018,33(2):1264-1274.
[15]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.Lou Yongjie,Li Yaohua,Wang Ping,et al.DC voltage adaptive droop control of multi-terminal HVDCsystems[J].Proceedings of the CSEE,2016,36(10):2588-2599(in Chinese).
[16]Chen Xia,Wang Long,Sun Haishun,et al.Fuzzy logic based adaptive droop control in multiterminal HVDC for wind power integration[J].IEEE Transactions on Energy Conversion,2017,32(3):1200-1208.
[17]Rouzbehi K,Miranian A,Luna A,et al.DC voltage control and power sharing in multiterminal DC grids based on optimal DC power flow and voltage-droop strategy[J].IEEE Journal of Emerging and Selected Topics in Power Electronics,2014,2(4):1171-1180.
[18]Abdel-Khalik A S,Massoud A M,Elserougi A A,et al.Optimum power transmission-based droop control design for multi-terminal HVDC of offshore wind farms[J].IEEETransactions on Power Systems,2013,28(3):3401-3409.
[19]管敏渊,徐政.MMC型VSC-HVDC系统电容电压的优化平衡控制[J].中国电机工程学报,2011,31(12):9-14.Guan Minyuan,Xu Zheng.Optimized capacitor voltage balancing control for modular multilevel converter based VSC-HVDC system[J].Proceedings of the CSEE,2011,31(12):9-14(in Chinese).
[2]姚良忠,吴婧,王志冰,等.未来高压直流电网发展形态分析[J].中国电机工程学报,2014,34(34):6007-6020.Yao Liangzhong,Wu Jing,Wang Zhibing,et al.Pattern analysis of future HVDC grid development[J].Proceedings of the CSEE,2014,34(34):6007-6020(in Chinese).
[3]Debnath S,Qin Jingchao,Bahrani B,et al.Operation,control,and applications of the modular multilevel converter:a review[J].IEEE Transactions on Power Electronics,2015,30(1):37-53.
[4]Nami A,Liang Jiaqi,Dijkhuizen F,et al.Modular multilevel converters for HVDC applications:review on converter cells and functionalities[J].IEEE Transactions on Power Electronics,2015,30(1):18-36.
[5]杨晓峰,郑琼林,薛尧,等.模块化多电平换流器的拓扑和工业应用综述[J].电网技术,2016,40(1):1-10.Yang Xiaofeng,Zheng Qionglin,Xue Yao,et al.Review on topology and industry applications of modular multilevel converter[J].Power System Technology,2016,40(1):1-10(in Chinese).
[6]汤广福,罗湘,魏晓光.多端直流输电与直流电网技术[J].中国电机工程学报,2013,33(10):8-17.Tang Guangfu,Luo Xiang,Wei Xiaoguang.Multi-terminal HVDC and DC-grid technology[J].Proceedings of the CSEE,2013,33(10):8-17(in Chinese).
[7]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 VSCmulti-terminal DC grids[J].Proceedings of the CSEE,2016,36(1):40-48(in Chinese).
[8]Sakamoto K,Yajima M,Ishikawa T,et al.Development of a control system for a high-performance selfcommutated AC/DC converter[J].IEEE Transactions on Power Delivery,1998,13(1):225-232.
[9]Johnson B K,Lasseter R H,Alvarado F L,et al.Expandable multiterminal DC systems based on voltage droop[J].IEEE Transactions on Power Delivery,1993,8(4):1926-1932.
[10]Haileselassie T M,Uhlen K.Impact of DC line voltage drops on power flow of MTDC using droop control[J].IEEE Transactions on Power Systems,2012,27(3):1441-1449.
[11]Xiao Liang,Xu Zheng,An Ting,et al.Improved analytical model for the study of steady state performance of droop-controlled VSC-MTDC systems[J].IEEETransactions on Power Systems,2017,32(3):2083-20983.
[12]吴金龙,刘欣和,王先为,等.多端柔性直流输电系统直流电压混合控制策略[J].电网技术,2015,39(6):1593-1599.Wu Jinlong,Liu Xinhe,Wang Xianwei,et al.Research of DC voltage hybrid control strategy for VSC-MTDCsystem[J].Power System Technology,2015,39(6):1593-1599(in Chinese).
[13]阎发友,汤广福,贺之渊,等.基于MMC的多端柔性直流输电系统改进下垂控制策略[J].中国电机工程学报,2014,34(3):397-404.Yan Fayou,Tang Guangfu,He Zhiyuan,et al.An improved droop control strategy for MMC-based VSC-MTDC systems[J].Proceedings of the CSEE,2014,34(3):397-404(in Chinese).
[14]Wang Weiyu,Li Yong,Cao Yijin,et al.Adaptive droop control of VSC-MTDC system for frequency support and power sharing[J].IEEE Transactions on Power Systems,2018,33(2):1264-1274.
[15]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.Lou Yongjie,Li Yaohua,Wang Ping,et al.DC voltage adaptive droop control of multi-terminal HVDCsystems[J].Proceedings of the CSEE,2016,36(10):2588-2599(in Chinese).
[16]Chen Xia,Wang Long,Sun Haishun,et al.Fuzzy logic based adaptive droop control in multiterminal HVDC for wind power integration[J].IEEE Transactions on Energy Conversion,2017,32(3):1200-1208.
[17]Rouzbehi K,Miranian A,Luna A,et al.DC voltage control and power sharing in multiterminal DC grids based on optimal DC power flow and voltage-droop strategy[J].IEEE Journal of Emerging and Selected Topics in Power Electronics,2014,2(4):1171-1180.
[18]Abdel-Khalik A S,Massoud A M,Elserougi A A,et al.Optimum power transmission-based droop control design for multi-terminal HVDC of offshore wind farms[J].IEEETransactions on Power Systems,2013,28(3):3401-3409.
[19]管敏渊,徐政.MMC型VSC-HVDC系统电容电压的优化平衡控制[J].中国电机工程学报,2011,31(12):9-14.Guan Minyuan,Xu Zheng.Optimized capacitor voltage balancing control for modular multilevel converter based VSC-HVDC system[J].Proceedings of the CSEE,2011,31(12):9-14(in Chinese).