基于载波层叠的MMC调制和电容电压控制研究
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摘要
基于MMC直流侧电容之间电压不平衡问题,对MMC调制技术和均压控制方法展开研究。在分析了传统调制策略基本原理与电容电压平衡方法基础上,发现现有方法存在执行时间长、复杂程度较高等问题。基于PD-PWM技术提出简化的控制均压策略,该策略优点为简化了MMC子模块数量的计算操作,触发信号可直接提供给子模块,使MMC的均压控制更加快速有效。在Matlab/Simulink环境下搭建了MMC 9电平模型,仿真结果验证了该策略的有效性,较好地实现了输出电压控制和电容电压均衡。
Based on the voltage imbalance between DC side capacitors of modular multilevel converter(MMC),the MMC modulation technique and voltage equalization method are studied. Based on the analysis of the basic principle of traditional modulation strategy and the method of capacitor voltage balance, it is found that the existing methods have problems such as long execution time and high complexity. Based on PD-PWM technology, a simplified control voltage equalization strategy is proposed. The advantage of this strategy is to simplify the calculation of the number of MMC sub-modules. The trigger signal can be directly provided to the sub-module, which makes the MMC equalization control more rapid and effective. The MMC 9 level model is built in Matlab/Simulink environment. The simulation results verify the effectiveness of the strategy,better output voltage control and capacitor voltage balance.
Based on the voltage imbalance between DC side capacitors of modular multilevel converter(MMC),the MMC modulation technique and voltage equalization method are studied. Based on the analysis of the basic principle of traditional modulation strategy and the method of capacitor voltage balance, it is found that the existing methods have problems such as long execution time and high complexity. Based on PD-PWM technology, a simplified control voltage equalization strategy is proposed. The advantage of this strategy is to simplify the calculation of the number of MMC sub-modules. The trigger signal can be directly provided to the sub-module, which makes the MMC equalization control more rapid and effective. The MMC 9 level model is built in Matlab/Simulink environment. The simulation results verify the effectiveness of the strategy,better output voltage control and capacitor voltage balance.
引文
[1]徐政.柔性直流输电系统[M].北京:机械工业出版社,2016.
[2]粟时平,魏新伟,牛鼎,等.模块化多电平换流器电容电压改进排序平衡方法[J].中国电机工程学报,2017,37(13):3874-3882.SU Shiping, WEI Xinwei, NIU Ding, et al.Modular multilevel converter capacitor voltage improvement sorting balance method[J]. Proceedings of the CSEE, 2017, 37(13):3874-3882.
[3]何智鹏,许建中,苑宾,等.采用质因子分解法与希尔排序算法的MMC电容均压策略[J].中国电机工程学报,2015,35(12):2980-2988.HE Zhipeng, XU Jianzhong, YUAN Bin, et al. MMC capacitor equalization strategy using mass factorization and Hill sorting algorithm[J]. Proceedings of the CSEE, 2015, 35(12):2980-2988.
[4]魏新伟,粟时平,邱欣,等.模块化多电平换流器电容电压新型优化平衡方法[J].电网技术,2017, 41(3):729-735.WEI Xinwei,SU Shiping,QIU Xin,et al. New optimized balance method for modular multilevel converter capacitor voltage[J]. Power System Technology, 2017, 41(3):729-735.
[5]许建中,赵成勇,Aniruddha MGole.模块化多电平换流器戴维南等效整体建模方法[J].中国电机工程学报,2015, 35(8):1919-1929.Xu Jianzhong, Zhao Chengyong, Aniruddha M Gole. Research on Theverin's equivalent based integral modelling method of the modular multilevel converter(MMC)[J]. Proceedings of the CSEE,2015, 35(8):1919-1929.
[6]DENG Fujin, CHEN Zhe. A control method for voltage balancing in modular multilevel converters[J]. IEEE Transactions on Power Electronics, 2014, 29(1):66-76.
[7]LI Z, WANG P, CHU Z, et al. An inner current suppressing method for modular multilevel converters[J]. IEEE Transactions on Power Electronics, 2013, 28(11):4873-4879.
[8]QIN Jiangchao, SAEEDIFARD M. Reduced switching-fequency voltage-balancing strategies for modular multilevel HVDC converts[J]. IEEE Transactions on Power Delivery, 2013, 28(4):2403-2410.
[9]李宁,王跃,王兆安,等. 4种三电平载波调制策略对比研究[J].电气传动,2015,45(12):35-40.LI Ning, WANG Yue, WANG Zhaoan, et al.Comparative study on four kinds of three-level carrier modulation strategies[J]. Electric Drive, 2015,45(12):35-40.
[10]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. Optimal balance control of capacitor voltage of MMC type VSCHVDC system[J]. Proceedings of the CSEE,2011, 31(12):9-14.
[11]李笑倩,宋强,刘文华.采用载波移相调制的模块化多电平换流器电容电压平衡控制[J].中国电机工程学报,2012,34(9):49-54.LI Xiaoqian, SONG Qiang, LIU Wenhua. Modular multilevel converter capacitor voltage balance control using carrier phase shift modulation[J].Proceedings of the CSEE, 2012, 34(9):49-54.
[12]于弘洋,彭傊,蔡林海,等.基于偏置动态分配方法的电流控制型多电平变流器均流策略[J].电力电容器与无功补偿,2017,38(2):155-159.YU Hongyang, PENG Yun, CAI Linhai, et al.Current-controlled multi-level converter current sharing strategy based on bias dynamic distribution method[J]. Power Capacitor and Reactive Power Compensation, 2017, 38(2):155-159.
[13]康鹏,邵震霞,孙斌,等.适用于MMC型柔性环网控制器的稳态无功与暂态电压协调控制策略[J].电力电容器与无功补偿,2018,39(2):84-89.KANG Peng, SHAO Zhenxia, SUN Bin, et al.Steady-state reactive power and transient voltage coordinated control strategy for MMC flexible ring network controller[J]. Power Capacitor and Reactive Power Compensation, 2018, 39(2):84-89.
[14]董文杰,张兴,刘芳,等.模块化多电平变流器均压策略研究[J].电力电子技术,2012, 46(2),69-71.DONG Wenjie, ZHANG Xin, LIU Fang, et al.Research on equalization strategy of modular multilevel converter[J]. Power Electronics, 2012,46(2):69-71.
[15]黄守道,廖武,高剑,等.基于改进均压算法的模块化多电平变流器开关频率分析[J].电工技术学报,2016,31(13):36-45.HUANG Shoudao, LIAO Wu, GAO Jian.Switching frequency analysis of modular multilevel converter based on improved equalization algorithm[J]. Transactions of China Electrotechnical Society, 2016, 31(13):36-45.
[16]朱晋,韦统振,霍群海,等.基于动态偏置分配PD-PWM的变桥臂换流器子单元电容均电容均压策略[J].电工技术学报,2016, 31(15):170-177.ZHU Jin, WEI Tongzhen, HUO Qunhai, et al.Capacitor voltage equalization strategy of variable bridge arm converter based on dynamic bias distribution PD-PWM[J]. Transactions of China Electrotechnical Society, 2016, 31(15):170-177.
[17]杨成子,黄萍.三角载波层叠PWM算法的数字实现与优化[J].电机控制与应用,2017,44(4):47-51.YANG Chengzi, HUANG Ping. Digital implementation and optimization of triangular carrier cascaded PWM algorithm[J]. Electric Machines and Control Application,2017,44(4):47-51.
[18]李蓉,文俊,刘若曦,等.MMC-HVDC系统谐波研究[J].电气应用,2017,36(21):27-33.LI Rong, WEN Jun, LIU Ruoxi. Research on harmonics of MMC-HVDC system[J].Electrotechnical Application, 2017,36(21):27-33.
[19]郭捷,刘曼,胡文平.模块化多电平换流器的混合PWM调制方法[J].电气应用,2015, 34(22):64-68.GUO Jie, LIU Man, HU Wenping. Hybrid PWM modulation method for modular multilevel converter[J]. Electrotechnical Application, 2015,34(22):64-68.
[2]粟时平,魏新伟,牛鼎,等.模块化多电平换流器电容电压改进排序平衡方法[J].中国电机工程学报,2017,37(13):3874-3882.SU Shiping, WEI Xinwei, NIU Ding, et al.Modular multilevel converter capacitor voltage improvement sorting balance method[J]. Proceedings of the CSEE, 2017, 37(13):3874-3882.
[3]何智鹏,许建中,苑宾,等.采用质因子分解法与希尔排序算法的MMC电容均压策略[J].中国电机工程学报,2015,35(12):2980-2988.HE Zhipeng, XU Jianzhong, YUAN Bin, et al. MMC capacitor equalization strategy using mass factorization and Hill sorting algorithm[J]. Proceedings of the CSEE, 2015, 35(12):2980-2988.
[4]魏新伟,粟时平,邱欣,等.模块化多电平换流器电容电压新型优化平衡方法[J].电网技术,2017, 41(3):729-735.WEI Xinwei,SU Shiping,QIU Xin,et al. New optimized balance method for modular multilevel converter capacitor voltage[J]. Power System Technology, 2017, 41(3):729-735.
[5]许建中,赵成勇,Aniruddha MGole.模块化多电平换流器戴维南等效整体建模方法[J].中国电机工程学报,2015, 35(8):1919-1929.Xu Jianzhong, Zhao Chengyong, Aniruddha M Gole. Research on Theverin's equivalent based integral modelling method of the modular multilevel converter(MMC)[J]. Proceedings of the CSEE,2015, 35(8):1919-1929.
[6]DENG Fujin, CHEN Zhe. A control method for voltage balancing in modular multilevel converters[J]. IEEE Transactions on Power Electronics, 2014, 29(1):66-76.
[7]LI Z, WANG P, CHU Z, et al. An inner current suppressing method for modular multilevel converters[J]. IEEE Transactions on Power Electronics, 2013, 28(11):4873-4879.
[8]QIN Jiangchao, SAEEDIFARD M. Reduced switching-fequency voltage-balancing strategies for modular multilevel HVDC converts[J]. IEEE Transactions on Power Delivery, 2013, 28(4):2403-2410.
[9]李宁,王跃,王兆安,等. 4种三电平载波调制策略对比研究[J].电气传动,2015,45(12):35-40.LI Ning, WANG Yue, WANG Zhaoan, et al.Comparative study on four kinds of three-level carrier modulation strategies[J]. Electric Drive, 2015,45(12):35-40.
[10]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. Optimal balance control of capacitor voltage of MMC type VSCHVDC system[J]. Proceedings of the CSEE,2011, 31(12):9-14.
[11]李笑倩,宋强,刘文华.采用载波移相调制的模块化多电平换流器电容电压平衡控制[J].中国电机工程学报,2012,34(9):49-54.LI Xiaoqian, SONG Qiang, LIU Wenhua. Modular multilevel converter capacitor voltage balance control using carrier phase shift modulation[J].Proceedings of the CSEE, 2012, 34(9):49-54.
[12]于弘洋,彭傊,蔡林海,等.基于偏置动态分配方法的电流控制型多电平变流器均流策略[J].电力电容器与无功补偿,2017,38(2):155-159.YU Hongyang, PENG Yun, CAI Linhai, et al.Current-controlled multi-level converter current sharing strategy based on bias dynamic distribution method[J]. Power Capacitor and Reactive Power Compensation, 2017, 38(2):155-159.
[13]康鹏,邵震霞,孙斌,等.适用于MMC型柔性环网控制器的稳态无功与暂态电压协调控制策略[J].电力电容器与无功补偿,2018,39(2):84-89.KANG Peng, SHAO Zhenxia, SUN Bin, et al.Steady-state reactive power and transient voltage coordinated control strategy for MMC flexible ring network controller[J]. Power Capacitor and Reactive Power Compensation, 2018, 39(2):84-89.
[14]董文杰,张兴,刘芳,等.模块化多电平变流器均压策略研究[J].电力电子技术,2012, 46(2),69-71.DONG Wenjie, ZHANG Xin, LIU Fang, et al.Research on equalization strategy of modular multilevel converter[J]. Power Electronics, 2012,46(2):69-71.
[15]黄守道,廖武,高剑,等.基于改进均压算法的模块化多电平变流器开关频率分析[J].电工技术学报,2016,31(13):36-45.HUANG Shoudao, LIAO Wu, GAO Jian.Switching frequency analysis of modular multilevel converter based on improved equalization algorithm[J]. Transactions of China Electrotechnical Society, 2016, 31(13):36-45.
[16]朱晋,韦统振,霍群海,等.基于动态偏置分配PD-PWM的变桥臂换流器子单元电容均电容均压策略[J].电工技术学报,2016, 31(15):170-177.ZHU Jin, WEI Tongzhen, HUO Qunhai, et al.Capacitor voltage equalization strategy of variable bridge arm converter based on dynamic bias distribution PD-PWM[J]. Transactions of China Electrotechnical Society, 2016, 31(15):170-177.
[17]杨成子,黄萍.三角载波层叠PWM算法的数字实现与优化[J].电机控制与应用,2017,44(4):47-51.YANG Chengzi, HUANG Ping. Digital implementation and optimization of triangular carrier cascaded PWM algorithm[J]. Electric Machines and Control Application,2017,44(4):47-51.
[18]李蓉,文俊,刘若曦,等.MMC-HVDC系统谐波研究[J].电气应用,2017,36(21):27-33.LI Rong, WEN Jun, LIU Ruoxi. Research on harmonics of MMC-HVDC system[J].Electrotechnical Application, 2017,36(21):27-33.
[19]郭捷,刘曼,胡文平.模块化多电平换流器的混合PWM调制方法[J].电气应用,2015, 34(22):64-68.GUO Jie, LIU Man, HU Wenping. Hybrid PWM modulation method for modular multilevel converter[J]. Electrotechnical Application, 2015,34(22):64-68.