Considering the Flexible Load New Energy Access System Optimization for Spinning Reserve

Abstract

Nowadays, large scale of new energy has been integrated in the power system, and operation uncertainty of the power system has been raised. In this condition, the traditional spinning reserve methods, taking conventional power source with capacity of some loads percentage as the reserve capacity, can no longer satisfy all the requirements of guaranteeing the power system reliability, economy and flexibility. To solve the abovementioned problem, based on an spinning reserve participating capability analysis of the loads, an optimized spinning reserve configuration method taking flexible loads into account is proposed. The flexible loads are divided into three categories by the proposed method: the transfer-able loads, the reduce-able loads and the virtual loads. The transfer-able loads can reduce the peak-valley difference and improve the spinning reserve capacity of the conventional power units by utilizing the time-of-use electricity price; the reduce-able and the virtual loads can enhance spinning reserve capacity of the power system by participating into the electricity market exchange. Comprehensively considering the virtual function of load lost and new energy curtailment in some low probability, high risk scenarios, taking the minimum overall costs of power system purchase, the flexible loads, the loads lost and the new energy curtailment as an objective, an optimized configuration model of the spinning reserve is established, and spinning reserve optimized configuration capacity in multiple time periods are calculated. Taking a regional power grid in Xinjiang as an example, the feasibility of the proposed method is verified by simulation.