【摘要】 分析了单相单级光伏逆变器的模型特点及其对最大功率点跟踪(maximum power point tracking,MPPT)控制的特殊要求,提出了适用于这种类型光伏逆变器的MPPT方法。该方法利用极值搜索算法实现MPPT控制,通过高通滤波器提取逆变器直流电压中的纹波电压,以该纹波电压为极值搜索算法的扰动信号;在极值搜索算法中引入优化补偿环节,通过该环节提高算法的收敛速度,进一步优化MPPT控制的稳态和动态性能。仿真和实验结果表明该方法可以充分利用单相单级逆变器的固有纹波,在无需额外注入扰动信号的前提下,该MPPT方法能够快速准确地搜索到最大功率点。更多还原

【Abstract】 In this paper,the model characteristic of single-phase single-stage photovoltaic inverter and the special requirement of maximum power point tracking(MPPT) control are analyzed;and the MPPT method suitable for this kind photovoltaic inverter is proposed.This method uses extremum seeking algorithm to implement MPPT control and uses a high pass filter(HPF) to extract the ripple voltage of inverter DC voltage,which is used as the disturbance signal for extremum seeking algorithm.To increase the convergence rate of extremum seeking algorithm,an optimized compensator is introduced,which increases the freedom of control loop,and improves the stability and dynamic performance of the new MPPT method.Simulation and experimental results demonstrate that the proposed method can make full use the inherent ripple of single-phase single-stage photovoltaic inverter;and can find the maximum power point quickly and precisely without injecting extra external disturbance signal.更多还原