1.School of Electrical Engineering, Southeast University, Nanjing 210096, China;2.Ningxia Electricity Power Marketing Centre Co., Ltd., Yinchuan 750000, China;3.NARI Group Corporation (State Grid Electric Power Research Institute), Nanjing 211106, China;4.State Key Laboratory of Smart Grid Protection and Control, Nanjing 211106, China

The renewable energy unit has the characteristics of flexible control and rapid response and the ability to participate in power system frequency regulation. If it is regarded as a frequency regulation resource, it would be beneficial to relieve system pressure. In this paper, the ancillary service market mechanism of renewable energy participating in frequency regulation is proposed considering the output fluctuation and uncertainty for renewable energy units. The performance index of frequency regulation is evaluated with the accuracy probability index, the risk loss of frequency regulation is calculated quantitatively, and the market clearing model considering the risk of frequency regulation of renewable energy is established. In the practical scheduling process, considering the deviation between the precision of real-time frequency regulation for renewable energy units and the historical data, a scheduling model of real-time frequency regulation based on model predictive control is constructed, and the feedback correction is used in scheduling based on accuracy indicators of scheduling results and real-time output of units. The proposed market mechanism and scheduling strategy not only make full use of renewable energy as the frequency regulation resource, but also effectively control the uncertainty risk of renewable energy output. Simulation results show the effectiveness of the model and algorithm.