减小电容容值的H桥级联型STATCOM电容取值分析与直流电压控制
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摘要
减小电容容值的H桥级联型静止同步补偿器(cascade H-bridgestatic synchronous compensator,CHB-STATCOM)采用薄膜电容可提升装置可靠性,但容值减小会对直流侧电压峰值和波动量、装置输出感性电流范围造成影响,且调制标幺方式和直流侧电压控制目标与传统STATCOM不同,为此,对减小电容容值的级联型STATCOM电容取值进行分析并建立一种直流电压控制方案。推导直流侧电容容值与电容电压的解析关系,以调制输出范围为约束条件,电容峰值电压一定时,求得电容取值与直流侧电压波动量、STATCOM输出感性电流范围的关系,并进行分析。推导功率单元电容电压与其瞬时功率的关系,对比不同被控量下控制系统数学模型,选取直流电压控制的被控量,建立直流电压的三级控制方案。仿真及实验结果验证了电容取值分析与控制方案的有效性。研究结果可为减小电容容值的级联型STATCOM电容取值提供理论参考,可满足电容电压的控制要求。
The cascaded H-bridge static synchronous compensator(CHB-STATCOM) with reduced capacitance value adopts thin film capacitor to improve reliability of the device. However, the reduced capacitance value affects peak voltage, and fluctuation voltage in DC side, and inductive current range. The modulation standard and voltage control target on DC side are different from traditional CHB-STATCOM. Therefore, the influence of CHBSTATCOM capacitor value is analyzed and a DC voltage control scheme is proposed. The analytic relationship between the capacitance value and DC side voltage is deduced. Under a certain DC voltage peak, the relationship of the capacitance value with the DC voltage fluctuation and the output inductive current range is obtained with modulation output scope as constraint. Based on this analytical relationship, analysis is carried out. The relationship between the capacitance voltage of the power module and its instantaneous power is also derived. Mathematical models of control system are compared under different controlled variables. DC voltage control variable is selected and a three-level control scheme of DC voltage is established. Simulation and experiment results verify effectiveness of the theoretical analysis and control scheme. The study provides insight for the CHB-STATCOM to reduce capacitance value, so control objectives of capacitor voltage can be satisfied.
The cascaded H-bridge static synchronous compensator(CHB-STATCOM) with reduced capacitance value adopts thin film capacitor to improve reliability of the device. However, the reduced capacitance value affects peak voltage, and fluctuation voltage in DC side, and inductive current range. The modulation standard and voltage control target on DC side are different from traditional CHB-STATCOM. Therefore, the influence of CHBSTATCOM capacitor value is analyzed and a DC voltage control scheme is proposed. The analytic relationship between the capacitance value and DC side voltage is deduced. Under a certain DC voltage peak, the relationship of the capacitance value with the DC voltage fluctuation and the output inductive current range is obtained with modulation output scope as constraint. Based on this analytical relationship, analysis is carried out. The relationship between the capacitance voltage of the power module and its instantaneous power is also derived. Mathematical models of control system are compared under different controlled variables. DC voltage control variable is selected and a three-level control scheme of DC voltage is established. Simulation and experiment results verify effectiveness of the theoretical analysis and control scheme. The study provides insight for the CHB-STATCOM to reduce capacitance value, so control objectives of capacitor voltage can be satisfied.
引文
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[19]赵学华,史丽萍,陈丽兵.基于复合控制的改进型级联STATCOM控制策略[J].电力系统保护与控制,2015,43(17):98-106.Zhao Xuehua,Shi Liping,Chen Libing.A new current control strategy of cascaded STATCOM with composite control[J].Power System Protection and Control,2015,43(17):98-106(in Chinese).
[20]周娟,张勇,耿乙文,等.四桥臂有源滤波器在静止坐标系下的改进PR控制[J].中国电机工程学报,2012,32(6):113-120.Zhou Juan,Zhang Yong,Geng Yiwen,et al.An improved proportional resonant control strategy in the static coordinate for four-leg active power filters[J].Proceedings of the CSEE,2012,32(6):113-120(in Chinese).
[2]Akagi H,Inoue S,Yoshii T.Control and performance of a transformerless cascade PWM STATCOM with star configuration[J].IEEE Transactions on Industry Applications,2007,43(4):1041-1049.
[3]夏正龙,史丽萍,杨晓冬,等.一种改进的电网电压不平衡环境下链式STATCOM控制策略[J].电网技术,2014,38(5):1310-1316.Xia Zhenglong,Shi Liping,Yang Xiaodong,et al.An improved control strategy for cascaded STATCOM under supply voltage imbalance[J].Power System Technology,2014,38(5):1310-1316(in Chinese).
[4]冯宇鹏,王先为,吴金龙,等.基于负序电流前馈的星型链式STATCOM链间均压策略[J].电网技术,2016,40(5):1502-1508.Feng Yupeng,Wang Xianwei,Wu Jinlong,et al.Clustered DC voltage balancing control of star-connected cascaded STATCOM based on negative current feed-forward control[J].Power System Technology,2016,40(5):1502-1508(in Chinese).
[5]杨波,曾光,钟彦儒,等.阶梯波调制法链式STATCOM直流电容电压平衡控制[J].电工技术学报,2013,28(10):280-287.Yang Bo,Zeng Guang,Zhong Yanru,et al.DC capacitor voltage balance control strategy of cascade STATCOM based on step wave modulation[J].Transactions of China Electrotechnical Society,2013,28(10):280-287(in Chinese).
[6]潘启军,黄垂兵,邓晨,等.电解电容与薄膜电容的对比分析[J].海军工程大学学报,2014,26(2):5-9.Pan Qijun,Huang Chuibing,Deng Chen,et al.Comparative analysis of electrolytic capacitor and thin film capacitor[J].Journal of Naval University of Engineering,2014,26(2):5-9(in Chinese).
[7]Wang H,Blaabjerg F.Reliability of capacitors for DC-Link applications in power electronic converters-an overview[J].IEEETransactions on Industry Applications,2014,50(5):3569-3578.
[8]Isobe T,Shiojima D,Kato K,et al.Full-bridge reactive power compensator with minimized-equipped capacitor and its application to static var compensator[J].IEEE Transactions on Power Electronics,2016,31(1):224-234.
[9]杨文博,宋强,刘文华,等.降低模块化多电平换流器子模块电容值的控制方法[J].电力系统自动化,2015,39(16):86-94.Yang Wenbo,Song qiang,Liu Wenhua,et al.A control strategy for reducing submodule capacitance value of modular multilevel converter[J].Automation of Electric Power Systems,2015,39(16):86-94(in Chinese).
[10]Chen R,Liu Y,Peng F Z.A solid state variable capacitor with minimum capacitor[J].IEEE Transactions on Power Electronic,2017,32(7):5035-5044.
[11]耿俊成,刘文华,袁志昌.链式STATCOM电容电压不平衡现象研究(一)仿真和试验[J].电力系统自动化,2003,27(16):53-57.Geng Juncheng,Liu Wenhua,Yuan Zhichang.Research on the voltage unbalance of dc capacitors of cascade STATCOM part one simulations and experiments[J].Automation of Electric Power Systems,2003,27(16):53-57(in Chinese).
[12]戴珂,徐晨,丁玉峰,等.载波轮换调制在级联H桥型STATCOM中的应用[J].中国电机工程学报,2013,33(12):99-106.Dai Ke,Xu Chen,Ding Yufeng,et al.The applications of carrier rotation modulation on cascaded h-bridges STATCOMs[J].Proceedings of the CSEE,2013,33(12):99-106(in Chinese).
[13]刘钊,刘邦银,段善旭,等.链式静止同步补偿器的直流电容电压平衡控制[J].中国电机工程学报,2009,29(30):7-12.Liu Zhao,Liu Bangyin,Duan Shanxu,et al.DC capacitor voltage balancing control for cascade multilevel STATCOM[J].Proceedings of the CSEE,2009,29(30):7-12(in Chinese).
[14]赵波,郭剑波,周飞.链式STATCOM相间直流电压平衡控制策略[J].中国电机工程学报,2012,32(34):36-41.Zhao Bo,Guo Jianbo,Zhou Fei.DC voltage balance control strategy among phases for cascaded STATCOM[J].Proceedings of the CSEE,2012,32(34):36-41(in Chinese).
[15]王志冰,于坤山,周孝信.H桥级联多电平变流器的直流母线电压平衡控制策略[J].中国电机工程学报,2012,32(6):56-63.Wang Zhibing,Yu Kunshan,Zhou Xiaoxin.Control strategy for DCbus voltage balance in cascaded h-bridge multilevel converters[J].Proceedings of the CSEE,2012,32(6):56-63(in Chinese).
[16]Isobe T,Zhang L,Tadano H,et al.Control of DC-capacitor peak voltage in reduced capacitance single-phase STATCOM[C]//IEEE17th Workshop on Control and Modeling for Power Electronics.Trondheim,Norway:IEEE,2016:1-8.
[17]Isobe T,Zhang L,Iijima R,et al.Experimental verification of capacitance reduction in MMC-based STATCOM[C]//IEEE Energy Conversion Congress and Exposition.Milwaukee.America:IEEE,2016:1-7.
[18]王轩,傅坚,腾乐天,等.链式静止同步补偿器电流控制策略[J].中国电机工程学报,2012,32(12):1-6.Wang Xuan,Fu Jian,Teng Letian,et al.Current control strategy of chain circuit STATCOM[J].Proceedings of the CSEE,2012,32(12):1-6(in Chinese).
[19]赵学华,史丽萍,陈丽兵.基于复合控制的改进型级联STATCOM控制策略[J].电力系统保护与控制,2015,43(17):98-106.Zhao Xuehua,Shi Liping,Chen Libing.A new current control strategy of cascaded STATCOM with composite control[J].Power System Protection and Control,2015,43(17):98-106(in Chinese).
[20]周娟,张勇,耿乙文,等.四桥臂有源滤波器在静止坐标系下的改进PR控制[J].中国电机工程学报,2012,32(6):113-120.Zhou Juan,Zhang Yong,Geng Yiwen,et al.An improved proportional resonant control strategy in the static coordinate for four-leg active power filters[J].Proceedings of the CSEE,2012,32(6):113-120(in Chinese).