Calculation Method of Output Simultaneous Coefficient of Regional Photovoltaic Power Station Considering Photovoltaic Capacity Ratio

With the rapid development of photovoltaic power generation, appropriately increasing the ratio of photovoltaic powerplant module capacity to inverter capacity has become an effective method to improve the comprehensive utilization rate of the photovoltaic system. The existing analysis method of photovoltaic power plant output simultaneity rate is no longer suitable for the future development of photovoltaics. In this paper, based on the photovoltaic operation data and the factors affecting the photovoltaic output, the monthly coefficient of photovoltaic power plant output is proposed through the operation data in the photovoltaic output large period at noon. Then, the 5% confidence interval is considered to calculate the daily average photovoltaic output and the actual daily output. The minimum value of them is taken as the monthly coefficient of photovoltaic power station output. Based on the monthly coefficient, the simultaneity rate of the photovoltaic power station is calculated, and the ratio of output power and inverter capacity under different capacity ratios and different photovoltaic power station output simultaneity rates is given. Finally, the effectiveness and adaptability of the proposed method are verified by the operation data of photovoltaic power stations in a provincial power grid.