Control Strategy of Energy Storage Participating in Secondary Frequency Regulation Based on Ultra-short-term Load Forecasting

Abstract

In recent years, energy storage(ES) has been widely used as a new auxiliary power grid frequency regulation(FR) means, however, its capacity configuration is still subject to its cost. In order to improve the utilization rate of energy storage capacity, under the condition of energy storage participating in the secondary frequency regulation, the output depth of the energy storage can be adaptively adjusted according to its frequency regulation capability; Under the condition of recovery of energy storage's state of charge(SOC), the SOC reference value is dynamically adjusted based on the ultra-short-term load forecasting result, and the real-time operating state constraints of the power grid are taken into consideration to determine the actual self-recovering power of the energy storage. Finally, the control strategy of energy storage assisting power grid frequency regulation is proposed by synthetically analyzing the demand of power grid frequency regulation and the capability of energy storage frequency regulation, and the flow chart of realization is presented. The proposed strategy is verified by simulating the actual load disturbance scenario of power grid in MATLAB/simulink. And the results of the simulation show that the proposed strategy has good frequency regulation effects and improves the utilization of energy storage capacity.