Voltage-controlled photovoltaic generator with MPP detection and mode switch

Photovoltaic inverter is difficult to operate in standalone mode without robust voltage source, which handicaps the development of renewable solar energy. If the inverter works in voltage control mode, it should balance the power flow between the resources and the loads. Utilizing limited power adjustment ability of photovoltaic arrays can improve this performance, which is effective if the assigned power of photovoltaic inverter is less than the maximum power of the arrays. However, if that premise cannot be satisfied, the PV inverter can be vulnerable to disturbance, where reasonable control and mode switch strategy are necessary in this situation. This paper will introduce the scheme of voltage-controlled photovoltaic generator that utilizes the principle of power conversion in synchronous generator. The control method in the situation that the maximum capability of photovoltaic arrays is less than the assigned power of inverter is designed. The proposed method is verified in simulation and hence the effectiveness is proved, which is practical for improving robustness and stability of microgrid integrated photovoltaic inverter.