摘要
基于单周期控制(OCC)的三相功率因数校正(PFC)整流器控制简洁且无需电网电压锁相及采样,在中小功率场合受到广泛应用。以三相三桥臂PFC整流器拓扑为研究对象,详细分析了整流器存在输入扰动/不平衡时,对基于OCC控制的PFC整流器控制环路及外特性影响。指出了控制环路及直流侧输出所存在的n±1倍频脉动信号经过开关函数作用,耦合至输入交流侧使得PFC交流电流含有丰富的奇次谐波,严重影响输入电流波形质量。为了改善上述工况下的PFC整流器外特性,提出一种新颖的基于多频复合谐振OCC改进控制策略,有效抑制了控制环路中含有的多频段脉动信号,提升了输入电流品质。上述分析和研究成果的正确性均获得了仿真与实验验证。
Three-phase power factor correction(PFC)rectifier based on one cycle control(OCC)is widely used in small and medium power situations because of simple control and needless input grid voltage phase-locking and sampling.Taking the topology of three-phase three-leg PFC rectifier as the research object,the influence of input disturbance/imbalance on the control loop and external characteristics of PFC rectifier based on OCC control was analyzed in detail.It was pointed out that the n±1 frequency doubling pulsation signal existing in the output of the control loop and the DC side was coupled to the input AC side through the switching function,which made the PFC AC current rich in odd harmonics and seriously affected the waveform quality of the input current.In order to improve the external characteristics of PFC rectifier under the above working conditions,a novel improved control strategy based on multi frequency compound resonance OCC was proposed,which effectively suppressed the multi frequency band pulsation signal contained in the control loop and improved the input current quality.The correctness of the above analysis and research results was verified by simulation and experiment.
作者
申小玲
李崇华
SHEN Xiaoling;LI Chonghua(School of Mechanical,Electrical and Energy Engineering,Guizhou Vocational Technology Institute,Guiyang 550023,Guizhou,China;College of Mechanical and Electrical Engineering,Guizhou Normal University,Guiyang 550028,Guizhou,China)
出处
《电气传动》
2021年第19期3-8,共6页
Electric Drive
基金
贵州省科技厅联合科研项目(2009GZ28567)。
关键词
功率因数校正
特性分析
多频复合谐振
单周期控制
power faction correction(PFC)
characteristics analysis
multi-frequency composite resonant
one cycle control(OCC)
