摘要
基于直接功率控制(DPC)策略三电平PWM整流器近年来得到了广泛关注,但由于存在较大的无功脉动,系统动静态性能受到严重制约。通过分析系统瞬时功率模型,指出常规DPC策略忽略的有功功率与无功功率耦合量是造成无功功率失控的主要原因。根据失控机理,在常规开关矢量表的基础上有针对性的添加备选空间电压矢量,提出了优化开关矢量表,解决了原开关表存在的无功功率"失控"问题。构建了MATLAB/simulink环境下的仿真模型,对三电平PWM整流器系统进行了仿真研究,结果表明基于优化开关表的DPC策略PWM整流器显著降低了无功功率脉动,提高了系统稳态性能。
Direct power control （DPC） for pulse width modulation （PWM） rectifier has been studied widely in recent years. Nevertheless, the performance of three-level PWM rectifier based on DPC was restricted due to the uncontrollable instantaneous reactive power. Through analyzing the instantaneous power model, the coupling term between active and reactive power was considered as the key to improve the static performance. An optimized switching table with new control vectors to eliminate the problem of uncontrollable reactive power caused by conventional switching table was then introduced. The simulation results under MATLAB/simulink verify that PWM rectifier with DPC strategy based on optimized switching table has a better static performance and lower reactive power ripple.
出处
《电源学报》
CSCD
2013年第2期46-51,共6页
Journal of Power Supply
基金
重庆市自然科学基金重点项目(cstc2012jjB107)
