摘要：The output power of PV module varies with module temperature, solar insolation and loads. And in order to quickly and accurately track the sun, it is necessary to track the maximum power point (MPP) all the time. After studying various algorithms, a new algorithm was presented in this paper based on online short-circuit current,open-circuit voltage, and variable step of perturbation and observation method. This algorithm could track MPP change rapidly and accurately without the disturbance of photovoltaic system, and also can reduce the power oscillation around MPP and the light mutation of the false judgement phenomenon. A theoretical analysis and the designed principle of the proposed algorithm are described in detail. And some experiment and simulation results are made to demonstrate that the effectiveness of the proposed algorithm and also the proposed could reach MPP which is faster than traditional P&O method about 0.2s. The system has a good dynamic and steady-state performance.
