电网电压不平衡下MMC的无源控制策略
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摘要
提出了电网电压不平衡条件下模块化多电平换流器(MMC)的无源控制方法,其能很好地解决电网电压不平衡条件下MMC存在的交流侧三相电流不对称、有功功率出现二次脉动、无功功率出现二次脉动的问题。根据MMC的拓扑结构,建立MMC在电网电压不平衡条件下的数学模型,分析MMC在电网电压不平衡条件下的内部特性,并在此基础上设计电网电压不平衡条件下的环流控制策略。基于存储函数的无源控制理论,针对上述3个不同的控制目标,制定相应的非线性无源控制策略。
The passive control method of MMC(Modular Multilevel Converter) under unbalanced grid voltage is proposed,which can solve the problems of three-phase current asymmetry on AC-side,secondary pulsation of active and reactive power in MMC under unbalanced grid voltage. According to the topological structure of MMC,the mathema-tical model under unbalanced grid voltage is established,and the internal characteristics under the unbalanced condition of grid voltage are analyzed. On this basis,the circulating current control strategy under unbalanced grid voltage is further designed. Then,based on the passive control theory of storage function,the corresponding nonlinear passive control strategy is proposed for the above three different control objectives.
The passive control method of MMC(Modular Multilevel Converter) under unbalanced grid voltage is proposed,which can solve the problems of three-phase current asymmetry on AC-side,secondary pulsation of active and reactive power in MMC under unbalanced grid voltage. According to the topological structure of MMC,the mathema-tical model under unbalanced grid voltage is established,and the internal characteristics under the unbalanced condition of grid voltage are analyzed. On this basis,the circulating current control strategy under unbalanced grid voltage is further designed. Then,based on the passive control theory of storage function,the corresponding nonlinear passive control strategy is proposed for the above three different control objectives.
引文
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[15] BERGNA-DIAZ G,ZONETTI D,SANCHEZ S,et al. PI passivity-based control of modular multilevel converters for multi-terminal HVDC systems[C]//IEEE 18th Workshop on Control and Mode-ling for Power Electronics(COMPEL). Stanford,CA,USA:IEEE,2017:1-8.
[16] LI Tao,CHENG Qiming,SUN Weisha,et al. Grid-connected control strategy of five-level inverter based on passive E-L model[J]. Energies,2017,10:1-14.
[17] 程启明,谭冯忍,程尹曼,等. 电网不平衡下基于内模观测器和无源控制器的DFIG 网侧变换器控制方法研究[J]. 高电压技术,2017,43(10):1-10.CHENG Qiming,TAN Fengren,CHENG Yinman,et al. Research on DFIG grid-side converter based on internal model observer and passivity-based controller under unbalanced grid voltage condition[J]. High Voltage Engineering,2017,43(10):1-10.
[18] 张宇,程启明,程尹曼,等. 电容中点式四线制 SAPF 混合无源非线性控制策略[J]. 电力系统自动化,2017,41(14):43-50.ZHANG Yu,CHENG Qiming,CHENG Yinman,et al. Hybrid passive nonlinear control strategy for three-phase four-wire SAPF[J]. Automation of Electric Power Systems,2017,41(14):43-50.
[2] 常非,王一,王一振,等. 基于模块化多电平变换器的高压直流输电故障特性与控制保护[J]. 高电压技术,2015,41(7):2428-2434.CHANG Fei,WANG Yi,WANG Yizhen,et al. Faults feature ana-lysis and control protection strategies of modular multilevel converter based high voltage direct current[J]. High Voltage Engineering,2015,41(7):2428-2434.
[3] 孙栩,朱晋,刘文龙,等. 一种具有故障隔离能力的MMC-HVDC换流站子模块拓扑研究[J]. 电力自动化设备,2017,37(3):120-125.SUN Xu,ZHU Jin,LIU Wenlong,et al. Fault-isolated sub-module topology of MMC-HVDC converter station[J]. Electric Power Automation Equipment,2017,37(3):120-125.
[4] 张芳,张光耀,李传栋. MMC-HVDC的二阶线性自抗扰控制策略[J]. 电力自动化设备,2017,37(11):92-98.ZHANG Fang,ZHANG Guangyao,LI Chuandong. Second-order li-near active disturbance rejection control strategy of MMC-HVDC[J]. Electric Power Automation Equipment,2017,37(11):92-98.
[5] YANG S,WANG P,TANG Y,et al. Circulating current suppression in modular multilevel converters with even-harmonic repetitive control[J]. IEEE Transactions on Industry Applications,2018,54(1):298-309.
[6] OU Z,WANG G. Modular multilevel converter control strategy based on arm current control under unbalanced grid condition[J]. IEEE Transactions on Power Electronics,2018,33(5):3826-3836.
[7] LI J,KONSTANTINOU G. Impact of circulating current control in capacitor voltage ripples of modular multilevel converters under grid Imbalances[J]. IEEE Transactions on Power Delivery,2018,33(3):1257-1267.
[8] 宋平岗,吴继珍,邹欢. 电网电压不平衡时模块化多电平换流器直接功率补偿控制策[J]. 高电压技术,2016,42(7):2184-2192. SONG Pinggang,WU Jizhen,ZOU Huan. Direct power compensa-tion control strategy for modular multilevel converter under unba-lanced grid voltage conditions[J]. High Voltage Engineering,2016,42(7):2184-2192.
[9] 梁营玉. 不对称电网电压下基于降阶矢量谐振器的MMC-HVDC直接功率控制策略[J]. 中国电机工程学报,2017,37(24):7294-7303.LIANG Yingyu. Direct power control strategy based on reduced order vector resonant controller for MMC-HVDC under unbalanced grid voltages[J]. Proceedings of the CSEE,2017,37(24):7294-7303.
[10] 张建坡,田新成,尹秀艳. 模块化多电平换流器直流输电控制策略[J]. 电力自动化设备,2015,35(11):103-108.ZHANG Jianpo,TIAN Xincheng,YIN Xiuyan. Control strategy of MMC-HVDC[J]. Electric Power Automation Equipment,2015,35(11):103-108.
[11] 李云丰,安婷,丁骁,等. 电网电压不平衡MMC-HVDC无锁相环控制策略[J]. 高电压技术,2016,42(1):105-111.LI Yunfeng,AN Ting,DING Xiao,et al. Control strategies of MMC-HVDC in the absence of PLL under unbalanced grid[J]. High Voltage Engineering,2016,42(1):105-111.
[12] 孔明,汤广福,贺之源,等. 不对称交流电网下 MMC-HVDC输电系统的控制策略[J]. 中国电机工程学报,2013,33(28):41-49.KONG Ming,TANG Guangfu,HE Zhiyuan,et al. A control strategy for modular multilevel converter based HVDC of unbalanced AC systems[J]. Proceedings of the CSEE,2013,33(28):41-49.
[13] PRIETO-ARAUJO E,JUNYENT-FERRé A,CLARIANA-COLET G,et al. Control of modular multilevel converters under singular unba-lanced voltage conditions with equal positive and negative sequence components[J]. IEEE Transactions on Power Systems,2017,32(3):2131-2141.
[14] 张建坡,赵成勇. MMC-HVDC直流侧故障特性仿真分析[J]. 电力自动化设备,2014,34(7):32-37.ZHANG Jianpo,ZHAO Chengyong. Simulation analysis of MMC-HVDC DC side fault characteristics[J]. Electric Power Automation Equipment,2014,34(7):32-37.
[15] BERGNA-DIAZ G,ZONETTI D,SANCHEZ S,et al. PI passivity-based control of modular multilevel converters for multi-terminal HVDC systems[C]//IEEE 18th Workshop on Control and Mode-ling for Power Electronics(COMPEL). Stanford,CA,USA:IEEE,2017:1-8.
[16] LI Tao,CHENG Qiming,SUN Weisha,et al. Grid-connected control strategy of five-level inverter based on passive E-L model[J]. Energies,2017,10:1-14.
[17] 程启明,谭冯忍,程尹曼,等. 电网不平衡下基于内模观测器和无源控制器的DFIG 网侧变换器控制方法研究[J]. 高电压技术,2017,43(10):1-10.CHENG Qiming,TAN Fengren,CHENG Yinman,et al. Research on DFIG grid-side converter based on internal model observer and passivity-based controller under unbalanced grid voltage condition[J]. High Voltage Engineering,2017,43(10):1-10.
[18] 张宇,程启明,程尹曼,等. 电容中点式四线制 SAPF 混合无源非线性控制策略[J]. 电力系统自动化,2017,41(14):43-50.ZHANG Yu,CHENG Qiming,CHENG Yinman,et al. Hybrid passive nonlinear control strategy for three-phase four-wire SAPF[J]. Automation of Electric Power Systems,2017,41(14):43-50.