Configuration of Energy Storage Devices in Regional Distribution Network Considering Optimal Load Control

Abstract

In allusion to the negative influences of distributed generations(DG) connected to regional distribution network on load characteristics, synthetically considering charging/discharging power constraints and operation constraint of battery energy storage system(BESS) as well as power flow balance constraint of distribution network, an optimal configuration model of energy storage system based on load optimization control is proposed. Taking peak load shaving and load smoothing as load control objectives respectively, three optimization strategies for peak load shaving such as controlling peak-valley difference of load, controlling load variance and controlling load rate, as well as three optimization strategies for load smoothing such as controlling load variation, controlling the square of load variation and controlling load variation rate are put forward, and combining with the cost optimization of energy storage devices, the proposed model is solved by two-stage particle swarm optimization(PSO) algorithm. Results of example simulation show that the controlling load variance is the most effective measure for peak load shaving and the controlling the square of load variation is the most effective one for load smoothing. Besides, the optimization tendency of load characteristic and the variation tendency of optimal configuration of energy storage capacity under different charging/discharging power constraints of energy storage system, which is available for reference to the configuration of energy storage system, are obtained.