Northwest China Branch of State Grid Corporation of China, Xi'an 710048, China

With the rapid growth of installed capacity of wind and solar power, the problem of wind and solar power curtailment has become increasingly prominent. It is of great significance to conduct the research on the accommodation capacity of renewable energy and establish the quantitative evaluation system of accommodation capacity for operation and control of grid dispatching. An assessment method of accommodation capacity of renewable energy based on non-time-series model is presented in this paper. Firstly, the probability distribution of theoretical output of renewable energy is obtained based on Archimedes Copula function. The probability distribution of accommodation space of renewable energy in the system is built based on load characteristics, and the probability distribution of electric power curtailment is obtained. Then, the rate of electric power curtailment of renewable energy is calculated according to the probability distribution of electric power curtailment of renewable energy, which evaluates the accommodation capacity of renewable energy in the system. Finally, the correctness and effectiveness of the proposed method are verified by EPRI 36-unit system and the effects of load, installed capacity of renewable energy, peak regulating rate of conventional units and backup level on the renewable energy curtailment ratio are analyzed.