特高压多端混合直流输电系统启动与故障穿越研究
|
摘要
采用常规直流与柔性直流混合的特高压多端直流输电系统是昆柳龙直流工程技术方案之一,对采用全桥和半桥混合拓扑的特高压柔性直流输电换流器充电时的均压问题进行分析,提出了两种不同的充电策略。研究了混合三端直流系统的启停顺控流程和直流线路瞬时故障穿越、重启策略。在RT-LAB中搭建三端混合直流输电系统,连接外部阀控装置进行实时仿真实验,实验结果验证了提出的充电策略的正确性,表明所提出的直流线路故障穿越和重启策略可以很好地实现系统穿越故障,使系统重新进入稳态。此外,在±10.5 k V/60 MW柔性直流背靠背样机上进行了充电策略验证和直流双极短路故障穿越后重启策略验证,充分验证了采用全半桥混合拓扑柔直系统的故障穿越能力。
This paper discussed one of the schemes for Kunliulong project, an ultra-high voltage three-terminal DC transmission system with hybrid VSC topology. The hybrid topology consisted of full-bridge sub-module and half-bridge sub-module brings in unbalanced capacitor voltages during charging process. Two charging strategies were proposed to deal with the problem. Besides, the charging and start-up process were researched with corresponding control strategies. The fault ride-through and restart strategy for DC fault was also proposed. A three-terminal hybrid DC system was then modeled in RT-LAB and connected with physical valve controller, based on which, a series of HIL tests were carried out to validate the effectiveness of the proposed charging strategies. Finally, a 10.5 kV/60 MW back to back VSC prototype applying 4500 V/3000 A IGBT was built to test the proposed DC fault ride-through and charging strategy. The experiment results illustrated the validity of the proposed strategy.
This paper discussed one of the schemes for Kunliulong project, an ultra-high voltage three-terminal DC transmission system with hybrid VSC topology. The hybrid topology consisted of full-bridge sub-module and half-bridge sub-module brings in unbalanced capacitor voltages during charging process. Two charging strategies were proposed to deal with the problem. Besides, the charging and start-up process were researched with corresponding control strategies. The fault ride-through and restart strategy for DC fault was also proposed. A three-terminal hybrid DC system was then modeled in RT-LAB and connected with physical valve controller, based on which, a series of HIL tests were carried out to validate the effectiveness of the proposed charging strategies. Finally, a 10.5 kV/60 MW back to back VSC prototype applying 4500 V/3000 A IGBT was built to test the proposed DC fault ride-through and charging strategy. The experiment results illustrated the validity of the proposed strategy.
引文
[1]饶宏,许树楷,周月宾,等.特高压柔性直流主回路方案研究[J].南方电网技术,2017,11(7):1-4+67.Rao Hong,Xu Shukai,Zhou Yuebin,et al.Research on Main Circuit Scheme of VSC-UHVDC[J].Southern Power System Technology,2017,11(7):1-4+67(in Chinese).
[2]饶宏,洪潮,周保荣,等.乌东德特高压多端直流工程受端采用柔性直流对多直流集中馈入问题的改善作用研究[J].南方电网技术,2017,11(3):1-5.Rao Hong,Hong Chao,Zhou Baorong,et al.Study on Improvement of VSC-HVDC at Invert Side of Wudongde Multi-terminal UHVDC for Problem of Centralized MultiInfeed HVDC[J].Southern Power System Technology,2017,11(3):1-5(in Chinese).
[3]汤广福,庞辉,贺之渊.先进交直流输电技术在中国的发展与应用[J].中国电机工程学报,2016,36(7):1760-1771.Tang Guangfu,Pang Hui,He Zhiyuan.R&D and Application of Advanced Power Transmission Technology in China[J].Proceedings of the CSEE,2016,36(7):1760-1771(in Chinese).
[4]熊岩,许建中,赵成勇,等.考虑相对误差和计算复杂度的MMC最佳等效仿真电平数的确定方法[J].中国电机工程学报,2016,36(7):1859-1867.Xiong Yan,Xu Jianzhong,Zhao Chengyong,et al.Optimal Selection of the Equivalent MMC Simulation Scale Considering the Relative Error and the Computation Complexity[J].Proceedings of the CSEE,2016,36(7):1859-1867(in Chinese).
[5]Zeng R,Xu L,Yao L,et al.Design and Operation of a Hybrid Modular Multilevel Converter[J].Power Electronics,IEEETransactions on,2015,30(3):1137-1146.
[6]李静怡,齐磊,赵翠宇,等.MMC预充电子模块电容电压均衡特性仿真建模[J].电网技术,2017,41(12):3816-3823.Li Jingyi,Qi Lei,Zhao Cuiyu,et al.Simulation and Modeling of Pre-Charging Voltage Balancing Among MMC SubModules[J].Power System Technology,2017,41(12):3816-3823(in Chinese).
[7]Zeng R,Xu L,Yao L,et al.Precharging and DC Fault Ridethrough of Hybrid MMC Based HVDC Systems[J].IEEETransactions on Power Delivery,2014,30(3):1298-1306.
[8]Xu J,Zhao C,He Z,et al.Start-up Control and DC Fault Ride-through Strategies of a Hybrid MMC-HVDC System Suitable for Overhead Line Transmission[C]//Future Energy Electronics Conference.IEEE,2015.
[9]华文,赵晓明,黄晓明,等.模块化多电平柔性直流输电系统的启动策略[J].电力系统自动化,2015,39(11):51-57.Hua Wen,Zhao Xiaoming,Huang Xiaoming,et al.A Start up Strategy for Modular Multilevel Converter Based HVDCSystem[J].Automation of Electric Power System,2015,39(11):51-57(in Chinese).
[10]肖晃庆,徐政,薛英林,等.多端柔性直流输电系统的启动控制策略[J].高电压技术,2014,40(8):2550-2557.Xiao Huangqing,Xu Zheng,Xue Yinglin,et al.Start Control Strategy of MMC-MTDC System.[J].High Voltage Engineering,2014,40(8):2550-2557(in Chinese).
[11]李超,方日升,唐志军,等.模块化多电平换流器预充电时子模块均压效果劣化机理研究[J].全球能源互联网,2018,1(1):65-72.Li Chao,Fang Risheng,Tang Zhijun,et al.Mechanism Study on Voltage Balance Effect Deterioration of Modular Multilevel Converter at Pre-Charging State[J].Journal of Global Energy Interconnection.2018,1(1):65-72(in Chinese).
[12]黄伟煌,许树楷,黄莹,等.特高压多端混合直流输电系统稳态控制策略[J].南方电网技术,2017,11(7):5-10.Huang Weihuang,Xu Shukai,Huang Ying,et al.Steady-state Control Strategy of Multi-terminal Hybrid UHVDC[J].Southern Power System Technology,2017,11(7):5-10(in Chinese).
[13]赵成勇,熊岩,徐义良,等.具有较低复杂度和开关频率的MMC混合排序均压算法[J].电力系统自动化,2017,41(15):136-142.Zhao Chengyong,Xiong Yan,Xu Yiliang,et al.Hybrid Sorting Algorithm With Low Complexity and Switching Frequency for Capacitor Voltage Balanced Control of Modular Multilevel Converter[J].Automation of Electric Power System,2017,41(15):136-142(in Chinese).
[14]Gnanarathna U N,Gole A M,Jayasinghe R P.Efficient Modeling of Modular Multilevel HVDC Converters(MMC)on Electromagnetic Transient Simulation Programs[J].IEEETransactions on Power Delivery,2011,26(1):316-324.
[15]熊岩,赵成勇,刘启建,等.模块化多电平换流器实时仿真建模与硬件在环实验[J].电力系统自动化,2016,40(21):84-89.Xiong Yan,Zhao Chengyong,Liu Qijian,et al.Modeling of Real-time Simulation and Hardware-in-the-loop Experiments for Modular Multilevel Converters[J].Automation of Electric Power System,2016,40(21):84-89(in Chinese).
[16]Saad H,Ould-bachir T,Mahseredjian J,et al.Real-time Simulation of MMCs using CPU and FPGA[J].IEEETransactions on Power Electronics,2015,30(1):259-267.
[17]熊岩,黄润鸿,郭铸,等.南澳三端柔性直流输电工程加装直流断路器的实时仿真[J].南方电网技术,2018,12(2):34-40.Xiong Yan,Huang Runhong,Guo Zhu,et al.Real-time Simulation of Nan’ao Three Terminal VSC-HVDC Project Equipped With DC Breaker[J].Southern Power System Technology,2018,12(2):34-40(in Chinese).
[2]饶宏,洪潮,周保荣,等.乌东德特高压多端直流工程受端采用柔性直流对多直流集中馈入问题的改善作用研究[J].南方电网技术,2017,11(3):1-5.Rao Hong,Hong Chao,Zhou Baorong,et al.Study on Improvement of VSC-HVDC at Invert Side of Wudongde Multi-terminal UHVDC for Problem of Centralized MultiInfeed HVDC[J].Southern Power System Technology,2017,11(3):1-5(in Chinese).
[3]汤广福,庞辉,贺之渊.先进交直流输电技术在中国的发展与应用[J].中国电机工程学报,2016,36(7):1760-1771.Tang Guangfu,Pang Hui,He Zhiyuan.R&D and Application of Advanced Power Transmission Technology in China[J].Proceedings of the CSEE,2016,36(7):1760-1771(in Chinese).
[4]熊岩,许建中,赵成勇,等.考虑相对误差和计算复杂度的MMC最佳等效仿真电平数的确定方法[J].中国电机工程学报,2016,36(7):1859-1867.Xiong Yan,Xu Jianzhong,Zhao Chengyong,et al.Optimal Selection of the Equivalent MMC Simulation Scale Considering the Relative Error and the Computation Complexity[J].Proceedings of the CSEE,2016,36(7):1859-1867(in Chinese).
[5]Zeng R,Xu L,Yao L,et al.Design and Operation of a Hybrid Modular Multilevel Converter[J].Power Electronics,IEEETransactions on,2015,30(3):1137-1146.
[6]李静怡,齐磊,赵翠宇,等.MMC预充电子模块电容电压均衡特性仿真建模[J].电网技术,2017,41(12):3816-3823.Li Jingyi,Qi Lei,Zhao Cuiyu,et al.Simulation and Modeling of Pre-Charging Voltage Balancing Among MMC SubModules[J].Power System Technology,2017,41(12):3816-3823(in Chinese).
[7]Zeng R,Xu L,Yao L,et al.Precharging and DC Fault Ridethrough of Hybrid MMC Based HVDC Systems[J].IEEETransactions on Power Delivery,2014,30(3):1298-1306.
[8]Xu J,Zhao C,He Z,et al.Start-up Control and DC Fault Ride-through Strategies of a Hybrid MMC-HVDC System Suitable for Overhead Line Transmission[C]//Future Energy Electronics Conference.IEEE,2015.
[9]华文,赵晓明,黄晓明,等.模块化多电平柔性直流输电系统的启动策略[J].电力系统自动化,2015,39(11):51-57.Hua Wen,Zhao Xiaoming,Huang Xiaoming,et al.A Start up Strategy for Modular Multilevel Converter Based HVDCSystem[J].Automation of Electric Power System,2015,39(11):51-57(in Chinese).
[10]肖晃庆,徐政,薛英林,等.多端柔性直流输电系统的启动控制策略[J].高电压技术,2014,40(8):2550-2557.Xiao Huangqing,Xu Zheng,Xue Yinglin,et al.Start Control Strategy of MMC-MTDC System.[J].High Voltage Engineering,2014,40(8):2550-2557(in Chinese).
[11]李超,方日升,唐志军,等.模块化多电平换流器预充电时子模块均压效果劣化机理研究[J].全球能源互联网,2018,1(1):65-72.Li Chao,Fang Risheng,Tang Zhijun,et al.Mechanism Study on Voltage Balance Effect Deterioration of Modular Multilevel Converter at Pre-Charging State[J].Journal of Global Energy Interconnection.2018,1(1):65-72(in Chinese).
[12]黄伟煌,许树楷,黄莹,等.特高压多端混合直流输电系统稳态控制策略[J].南方电网技术,2017,11(7):5-10.Huang Weihuang,Xu Shukai,Huang Ying,et al.Steady-state Control Strategy of Multi-terminal Hybrid UHVDC[J].Southern Power System Technology,2017,11(7):5-10(in Chinese).
[13]赵成勇,熊岩,徐义良,等.具有较低复杂度和开关频率的MMC混合排序均压算法[J].电力系统自动化,2017,41(15):136-142.Zhao Chengyong,Xiong Yan,Xu Yiliang,et al.Hybrid Sorting Algorithm With Low Complexity and Switching Frequency for Capacitor Voltage Balanced Control of Modular Multilevel Converter[J].Automation of Electric Power System,2017,41(15):136-142(in Chinese).
[14]Gnanarathna U N,Gole A M,Jayasinghe R P.Efficient Modeling of Modular Multilevel HVDC Converters(MMC)on Electromagnetic Transient Simulation Programs[J].IEEETransactions on Power Delivery,2011,26(1):316-324.
[15]熊岩,赵成勇,刘启建,等.模块化多电平换流器实时仿真建模与硬件在环实验[J].电力系统自动化,2016,40(21):84-89.Xiong Yan,Zhao Chengyong,Liu Qijian,et al.Modeling of Real-time Simulation and Hardware-in-the-loop Experiments for Modular Multilevel Converters[J].Automation of Electric Power System,2016,40(21):84-89(in Chinese).
[16]Saad H,Ould-bachir T,Mahseredjian J,et al.Real-time Simulation of MMCs using CPU and FPGA[J].IEEETransactions on Power Electronics,2015,30(1):259-267.
[17]熊岩,黄润鸿,郭铸,等.南澳三端柔性直流输电工程加装直流断路器的实时仿真[J].南方电网技术,2018,12(2):34-40.Xiong Yan,Huang Runhong,Guo Zhu,et al.Real-time Simulation of Nan’ao Three Terminal VSC-HVDC Project Equipped With DC Breaker[J].Southern Power System Technology,2018,12(2):34-40(in Chinese).