Coordinated peak regulation control strategy of BESS and thermal power units in high proportion new energy power system

Abstract

With the rapid development of new energy in recent years, its proportion in the power grid is increasing. The impact of its randomness, intermittence and negative peak regulation characteristics on the power grid is more and more significant. The “duck curve” characteristic of high proportion of new energy is obvious, which brings great pressure to the peak load regulation of power grid. BESS(battery energy storage system) is a kind of flexible and high-quality power grid regulation resources, which has fast output response ability and flexible configuration mode. It can significantly improve the peak load regulation ability of power grid by cooperating with conventional regulating power sources such as thermal power units, and effectively cope with the impact of new energy on peak load regulation of power grid. This paper first analyzes the impact of wind power and photovoltaic negative peak regulation characteristics on regional power grid peak regulation, and then proposes a coordinated peak regulation control strategy based on multi-scale signal decomposition theory for energy storage and thermal power units, and verifies the effectiveness of the method through simulation examples. This method can give full play to the ability of rapid regulation of BESS when the ratio of BESS is not high, and effectively deal with the peak regulation problem of high proportion of new energy power system.