摘要
主要研究了PWM整流器在电网电压不平衡时的数学模型和基于该数学模型的控制策略。首先,分析了PWM整流器在不平衡时用正序电动势、负序电动势和零序电动势描述的数学模型。然后,利用网侧功率平衡原理设计了电流指令计算方法。基于这种方法,设计了正负序电流独立控制的功率平衡控制策略。正负序电流独立控制最后将正负序电压信号合成为一个电压信号。通过仿真,进一步验证了该方法是可行的。
The control strategies of PWM rectifier when the three-phase power supply voltage are unbalanced are mainly discussed in this paper. PWM rectifier＇s mathematic model and control strategy are discussed when the power supply voltage is unbalanced. The positive and negative sequence current separate control strategy is utilized. When the voltage and current are controlled separately, the control principle is same to the vector control and the difference is the positive sequence current and the negative sequence current composed to be one at last. The simulation results prove the control strategies can fulfill the requirement.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2009年第22期13-16,共4页
Power System Protection and Control
