摘要
利用电压型PWM整流器的数学模型分析了PWM整流器直接功率控制(DPC)的原理,讨论了功率滞环比较器环宽对PWM整流器的影响.为了降低开关频率和减少开关损失, 增加功率滞环比较器环宽则引起瞬时有功功率和直流电压波动现象;提出了设置扇形边界死区的控制策略,减少扇形边界误选开关量现象,使瞬时有功功率和直流电压波形趋于平稳. 通过Simulink环境下仿真模型的仿真,证明了该策略的可行性.
The direct power control (DPC) principle of three-phase boost-type PWM rectifiers based on the mathematical model of PWM rectifiers was analyzed. The effect of the hysteresis wide of power hysteresis comparators on the properties of the PWM rectifiers was discussed. Since the hysteresis wide is widened for decreasing switching frequency and energy loss, which causes the pulsation of instantaneous active power and direct current voltage, a control strategy with the dead zone of sector borders was proposed for eliminating the mistakes of selecting switch vectors on sector borders and improving the waveforms of instantaneous active power and direct current voltage. Simulink simulation shows the feasibility of the control strategy.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2005年第3期380-384,共5页
Journal of University of Science and Technology Beijing
基金
北京市重点自然科学基金项目(No.KZ200410005005)
关键词
PWM整流器
直接功率控制
死区
扇形边界
开关表
仿真
Hysteresis
Mathematical models
Power control
Pulse width modulation
Reactive power
Switching
Vectors
