A Capacity Configuration Method of Pure Wind-Solar-storage Hybrid System in Micro-grid Considering Output Confidence

With the increase of the proportion of new energy in the power system, the quantitative evaluation of their effect on power and electricity balance gains more and more attention. Due to the uncertainty and intermittence of the output power, it is difficult for the pure wind-solar hybrid system to satisfy the load demand perfectly. As for the mismatch between the load demand and the output power of new energy, the energy storage is necessary. In order to analyze the effect of pure wind-solar-storage hybrid on power balance, this paper firstly analyzes the daily fluctuation and seasonal characteristics of the output of new energy. It is found that the output confidence can be recognized as a key factor for evaluating the effect of wind plants and photovoltaic power stations on ensuring the power supply. Then, a capacity configuration method of pure wind-solar-storage hybrid system in micro-grid is proposed. Case analysis verifies the validity of the proposed method. By considering the output confidence, the proposed method is helpful for evaluating the effect of new energy on power balance quantitatively.