独立逆变器无电流互感器控制研究

Study on Current-sensorless Control for Standalone Inverters

针对独立逆变器的应用,提出了一种采用估计电容电流来实现无电流互感器多环控制的逆变器方案,分析了各个控制环原理,建立了控制器的数学模型,并着重通过模型和仿真讨论了在估计电容电流中由电容参数偏差对系统动静态特性的影响,最后给出了几种电容参数偏差下无电流互感器控制逆变器的实验结果。其结果证明了该控制方法的有效性。

A current-sensorless multi-loop control method by estimating the capacitor current is proposed for standalone inverters application.The theories of these control loops are analyzed,then the mathematic model is built up.The effect of capacitor parameter mismatch on system characteristic is emphatically discussed by the model and simulation methods.Finally,the experimental results about the output voltage characteristics of the current-sensorless inverter under parameter mismatch conditions verify the proposed control method is effective.