一种低谐波三相AC/DC变换器的控制方法与实现

Control Method and Implementation for a Low-harmonic Three-phase AC/DC Converter

分析了基于能量平衡的三相AC/DC变换器的工作原理 ,根据瞬时无功功率理论得到了三相输入电流的指令信号 ,采用直接电流控制的方法进行电流跟踪控制 ,并通过以TMS32 0F2 4 0数字信号处理器为主的控制电路实现了所提出的方法。样机实验表明 ,用这种方法控制的三相AC/DC变流器具有输入电流谐波小、功率因数高、输入电流连续、系统结构简单。

The principle of three phase AC/DC converter based on energy balance is analyzed in this paper.The input current signal is available directly through introducing instantaneous reactive power theory into PWM rectifier,and a direct current control method has been applied to trace current signal.A prototype has been realized through a controller on the core pf TMS320F240 DSP.Experiments show this method has the characteristics of low input harmonic,high power factor,constant input current,simple system structure,and robust operation.