基于瞬时功率理论的电压型PWM整流器研究

Research on Instantaneous Power Theory of Voltage Source PWM Rectifier

针对传统功率定义的局限性,分析了三相电路瞬时功率理论,设计了直接功率控制系统。控制系统采用功率控制内环、直流电压外环的系统结构。在Matlab/Simulink环境下搭建了仿真模型并进行分析。基于DSP芯片适合PWM整流器控制的特点,对直接功率控制系统进行了软硬件设计,在小功率实验系统上进行了调试。实验结果表明,直接功率控制具有功率因数高、效率高、算法及系统结构简单、动态响应快的优点。

Aiming at the disadvantage of traditional power definition,the paper analyzes instantaneous power theory of three phase circuit and designs direct power control（DPC）system.The control system includes inner power control loop and outer DC voltage loop.The DPC system is researched by simulation model based on Matlab/Simulink.The high speed integrated control chip DSP is the core of PWM rectifier control,following designing the hardware circuits and DSP program of the DPC system in low-power PWM rectifier system.The experimental results indicate DPC system has the advantage of high power factor and efficiency,simple arithmetic and system composing,better dynamic response.