单相两级联H桥整流器负载不平衡度范围研究
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摘要
级联H桥整流器在实际运行中会因负载不平衡产生直流母线电容电压不平衡问题。针对负载不平衡下直流母线电压平衡问题,提出了直流母线参考电压范围内的负载不平衡限制范围。为减小锁相环给系统控制带来的复杂性,采用无锁相环控制结构。通过深入研究二维调制控制算法,推导出两桥调制波电压波形。然后根据功率平衡原则推导出系统稳定运行在单位功率因数下的负载不平衡限制范围,同时给出了直流母线参考电压选取范围。仿真和实验结果验证了所提出的直流侧电压选取范围与负载不平衡限制范围的有效性与可行性,对级联H桥整流器系统参数设计提供了有重要依据。
Due to load imbalance, the dc-link capacitor voltage imbalance problem will occur in the actual operation of cascaded H-bridge rectifier. To solve the problem of dc-link voltage balance under unbalanced load, we put forward the range of load imbalance within the dc-link reference voltage. In order to reduce the complexity of the phase-locked loop to the system control, the lockless loop control structure is adopted. Through in-depth study of the two-dimensional control algorithm, the voltage waveform of two-bridge modulation wave is deduced. Then, according to the principle of power balance, the load unbalance limit range is deduced when the system is under unit power factor. Meanwhile, the reference range of dc-link voltage is given. The simulation and experiment results have verified the validity and effectiveness of dc-link reference voltage selection range and the load imbalance limit range, which provides an important basis for the design of cascaded H-bridge rectifier system parameters.
Due to load imbalance, the dc-link capacitor voltage imbalance problem will occur in the actual operation of cascaded H-bridge rectifier. To solve the problem of dc-link voltage balance under unbalanced load, we put forward the range of load imbalance within the dc-link reference voltage. In order to reduce the complexity of the phase-locked loop to the system control, the lockless loop control structure is adopted. Through in-depth study of the two-dimensional control algorithm, the voltage waveform of two-bridge modulation wave is deduced. Then, according to the principle of power balance, the load unbalance limit range is deduced when the system is under unit power factor. Meanwhile, the reference range of dc-link voltage is given. The simulation and experiment results have verified the validity and effectiveness of dc-link reference voltage selection range and the load imbalance limit range, which provides an important basis for the design of cascaded H-bridge rectifier system parameters.
引文
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[15]LIU Z,LIU B,DUAN S,et al.A novel DC capacitor voltage balance control method for cascade multilevel STATCOM[J].IEEE Transactions on Power Electronics,2012,27(1):14-27.
[16]王顺亮,宋文胜,冯晓云.基于电压补偿分量注入的单相级联H桥整流器载波调制与电容电压平衡方法[J].中国电机工程学报,2015,35(12):3117-3123.WANG Shunliang,SONG Wensheng,FENG Xiaoyun.Carrier-based modulation and capacitor voltage balance control method with voltage offset injection of single phase cascaded H-bridge rectifiers[J].Proceedings of the CSEE,2015,35(12):3117-3123
[17]张兴,张崇巍.PWM整流器及其控制[M].北京:机械工业出版社,2012.ZHANG Xing,ZHANG Chongwei.PWM rectifier and its control[M].Beijing,China:China Machine Press,2012.
[2]李宋,叶满园.混合级联多电平逆变器混合频率载波调制技术[J].高电压技术,2015,41(7):2378-2383.LI Song,YE Manyuan.Hybrid frequency carrier modulation technique for hybrid cascade multi-level inverter[J].High Voltage Engineering.2015,41(7):2378-2383.
[3]LEON J I,KOURO S,VAZQUEZ S,et al.Multidimensional modulation technique for cascaded multilevel converters[J].IEEETransactions on Industry Electronics,2011,58(2):412-420.
[4]娄慧波,毛承雄,陆继明,等.基于锯齿波的载波移相脉冲宽度调制技术[J].高电压技术,2012,38(4):993-998.LOU Huibo,MAO Chengxiong,LU Jiming,et al.Carrier phase shifted pulse width modulation technique based on sawtooth wave[J].High Voltage Engineering,2012,38(4):993-998.
[5]顾春阳,郑泽东,李永东.用于机车牵引的新型级联H桥整流器电压平衡方法[J].电工技术学报,2013,28(12):168-172.GU Chunyang,ZHENG Zedong,LI Yongdong.A novel voltage balancing method of cascaded H-bridge rectifiers for locomotive traction applications[J].Transactions of China Electrotechnical Society,2013,28(12):168-172.
[6]杨韬,帅智康,兰征,等.直流电压不平衡下的单相级联PWM整流器无锁相环均压控制[J].电网技术,2015,39(4):1167-1172.YANG Tao,SHUAI Zhikang,LAN Zheng,et al.Voltage-sharing control of single-phase cascaded PWM rectifier without phase-lock loop under unbalanced DC voltage condition[J].Power System Technology,2015,39(4):1167-1172.
[7]VAZQUEZ S,LEON J I,CARRASCO J M,et al.Controller design for a single-phase two-cell multilevel cascade H-bridge converter[C]∥IEEE International Symposium on Industrial Electronics.[S.l.]:IEEE,2008:2342-2347.
[8]SHI J,GOU W,YUAN H,et al.Research on voltage and power balance control for cascaded modular solid-state transformer[J].IEEETransactions on Power Electronics,2011,26(4):1154-1166.
[9]SHE X,HUANG A Q,ZHAO T,et al.Coupling effect reduction of a voltage-balancing controller in single-phase cascaded multilevel converters[J].IEEE Transactions on Power Electronics,2012,27(8):3530-3543.
[10]郑征,李邵令.基于二维调制的级联型整流器控制策略研究[J].电力电子技术,2015,49(7):92-96.ZHENG Zheng,LI Shaoling.Research on the control strategy of cascade rectifier based on two dimensional modulation[J].Journal of Power Electronics,2015,49(7):92-96.
[11]王聪,张国澎,王俊,等.一种适用于级联H桥整流直流侧电容电压快速平衡的新型调制方法[J].电工技术学报,2013,28(8):120-127.WANG Cong,ZHANG Guopeng,WANG Jun,et a1.A novel modulation method for fast balancing DC-link capacitor voltages of cascaded H-bridge rectifier[J].Transactions of China Electrotechnical Society,2013,28(8):120-127.
[12]VAZQUEZ S,LEON 1 I,CARRASCO 1 M,et al.Analysis of the power balance in the cells of a multilevel cascaded H-bridge converter[J].IEEE Transactions on Industrial Electronics,2010,57(7):2287-2296.
[13]TAO X H,LI Y D,XU L,et al.Analysis of stable area of two-cell cascaded H-bridge rectifier[C]∥14th International Conference on Electrical Machines and Systems(ICEMS'2011).[S.l.]:[s.n.],2011:1-5.
[14]SEPAHVAND H,LIAO J,FERDOWSI M,et al.Capacitor voltage regulation in single-DC-source cascaded H-bridge multilevel converters using phase-shift modulation[J].IEEE Transactions on Industrial Electronics,2013,60(9):3619-3626.
[15]LIU Z,LIU B,DUAN S,et al.A novel DC capacitor voltage balance control method for cascade multilevel STATCOM[J].IEEE Transactions on Power Electronics,2012,27(1):14-27.
[16]王顺亮,宋文胜,冯晓云.基于电压补偿分量注入的单相级联H桥整流器载波调制与电容电压平衡方法[J].中国电机工程学报,2015,35(12):3117-3123.WANG Shunliang,SONG Wensheng,FENG Xiaoyun.Carrier-based modulation and capacitor voltage balance control method with voltage offset injection of single phase cascaded H-bridge rectifiers[J].Proceedings of the CSEE,2015,35(12):3117-3123
[17]张兴,张崇巍.PWM整流器及其控制[M].北京:机械工业出版社,2012.ZHANG Xing,ZHANG Chongwei.PWM rectifier and its control[M].Beijing,China:China Machine Press,2012.