Performance Evaluation of Grid-Connected Operation of Multi-Energy Complementary System

The grid connection of large-scale wind power and photovoltaics has changed the frequency and voltage characteristics of the traditional power grid. The renewable energy generation system with new energy as the main body has put forward higher requirements for the performance of new energy grid connection, including the multi-energy complementary system(MECS) of renewable energy and energy storage. There is no unified measurement standard for the performance of access to the grid. Therefore, starting from the performance of MECS connected to the power grid, such as autonomous frequency regulation, autonomous voltage regulation, active/reactive power control, etc., a performance evaluation method of MECS connected to the power grid is given. Referring to the relevant standards for renewable energy and energy storage grid connection, a three-level index system for evaluating the grid-connected operation performance of MECS including target-level, performance-level and detail-level is constructed. The fuzzy evaluation method is used to analyze the grid-connected performance of a multi-energy complementary power station in Qinghai Province. The validity and applicability of the proposed evaluation method are verified.