光伏并网逆变器的电能质量分析

Analysis of Power Quality for Grid-connected Photovoltaic Inverter

准确、实时地检测电网电压及并网电流对光伏并网逆变器的可靠运行具有重要的指导意义。着重分析了Z源光伏并网逆变器的电能质量分析系统的软件实现方法,通过对电网电压及并网电流的数据采样和处理,得到有效值、有功功率、无功功率等电力参数,并采用快速傅里叶变换(FFT)算法实现并网电流THD的计算。实验结果证明了理论分析和软件设计方案的正确性。

The accurate and real-time detections of grid voltage and current from PV inverter have great guide significance for the reliable operation of PV grid-connected inverter. The software realization methods of power quality analysis system based on Z-source PV grid-connected inverter was analyzed. RMS, active power, reactive power and other power parameters were obtained by sampling and processing grid voltage and grid-connected current. Fast Fourier Transform （FFT） algorithm was proposed to calculate THD of the grid-connected current. Experimental results demonstrate the availability and correctness of the theoretical analysis and software design.