Distributed multi-energy storage cooperative optimization control method for power grid voltage stability enhancement

Abstract

To solve the problem of grid voltage fluctuation in multi-energy systems, this study proposes a voltage optimization control method based on the coordination of battery storage, heat storage, and gas storage. First, the different operation modes of electricity, heat, and gas in the system were analysed, and a coupling model of an energy system with multi-energy storage was established. Second, according to the energy storage characteristics of distributed energy storage, a collaborative optimization model of distributed energy storage was established by studying the influence mechanism of battery storage, gas storage, and heat storage on grid voltage stability. Taking the minimum voltage fluctuation as the optimization objective, a coordinated operation strategy of distributed energy storage is proposed under the premise of meeting the constraints of distributed energy storage. Combined with the real-time charging and discharging states of each distributed energy storage system, the particle swarm optimization method was used to maintain the node voltage stability. Finally, a regional multi-energy system is taken as an example to verify that the proposed collaborative optimization control method can effectively improve grid voltage stability. Through the results, it can be seen that the node voltage in the regional power grid has increased by 0.012p.u., 0.012p.u. 0.011p.u. 0.014p.u.