Improved PV Model and its Application in Reliability Evaluation of Microgrid

Accurate modeling for renewable energy generation system is a key factor to analyze the stability, security and reliability of grid-connected power system. Aiming at reliability analysis of the photovoltaic (PV) power generation system, based on detailed analysis of characteristics and deficiencies of existed PV output models, an improved model is proposed in this paper, with the operating condition constraints, namely irradiance, temperature and operating capacity, taken into consideration comprehensively. In order to further analyze its influence on microgrid reliability evaluation, the reliability evaluation process based on sequential Monte Carlo state sampling method is designed and conducted. Theoretical analysis and evaluation results show that the proposed model can make evaluation results more rigorous, and the variance of the actual output power can be decreased to accelerate the convergence rate compared with the existed models.