基于无谐波检测环节三电平APF的研究

Research of the Three-level APF Based on Removal of the Harmonic Part

针对有源电力滤波器谐波检测环节中存在低通滤波器、数字低通滤波器实现复杂,会加重DSP程序的运算负担,且滤波器的截止频率大时快速性高,滤波效果变差,截止频率小时滤波效果好,降低了快速性的问题。在APF常规控制算法等效演化变换的基础上,结合APF电网电压前馈及电流反馈解耦,提出了一种改进的无谐波检测环节的三电平APF控制系统。仿真结果验证了该控制系统的可行性与优越性。

For the problem with the harmonic dectetion of APF that the low-pass filter and the digital low-passfilter are complicated to achieve and but also increase the burden of DSP programme,and higher cut-off frequencybrings faster response but weaken filtering effect while lower cut-off frequency brings better filtering effect but slowerresponse,proposed a improved control system for three-level APF without harmonic detection based on equivalentevolutionary transformation of conventional APF control algorithm and combining the decoupling algorithm of gridvoltage feedforward and current feedback. And the similation results demonstrate the feasibility and superiority of theproposed control system.