具有自适应无功和谐波补偿功能的并网逆变器设计

针对电网的污染问题设计了太阳能光伏并网逆变器,实现向电网传递有功功率的同时对电网电流中的无功和谐波分量进行补偿,改善电网质量,使电网电流正弦化。基于自适应陷波滤波器ANF原理,介绍了一种适用于单相电路负载的无功和谐波电流提取的新方法。该方法能较为准确快速地检测出所需信号的幅值、相位和频率等信息,并且在负载变化时保持较快的响应速度。最后,在Matlab/Simulink环境下对该理论进行仿真,验证了该方法的可行性。

Design of Grid-connected Inverters with Functions of Adaptive Reactive and Harmonic Compensation

Aiming at the problem of grid pollution, PV grid-connected inverter is designed to both transfer active power and compensate the reactive and harmonic current, improve the power quality and make the grid current sinusoidal. Based on the adaptive notch filter(ANF) theory, a new approach to extracting the load's reactive and harmonic current is proposed, which is adapted to single-phase load current. The foregoing method can accurately and quickly detect the necessary signal for the amplitude, phase position and frequency, What's more, it can response fast when the load is changed. Finally, the result of Matlab/Simulink simulation shows that the above-mentioned theory is effective.