微电网储能系统控制及其经济调度方法

储能系统对微电网的安全稳定运行和经济效益有重要影响。分析微电网中分布式储能系统的离网和并网控制方法;针对传统下垂控制中,线路阻抗引起的微电网系统稳定性问题,提出改进的下垂控制策略和控制结构,以减少微电网功率波动和提高运行稳定性。为实现对负荷的削峰填谷和提高储能设备运行经济性,根据分时电价,建立分布式储能系统的经济调度数学模型,在此基础上提出一种考虑分时电价的经济调度方法。结合算例验证该调度方法的经济性和实用性。

Operation Control and Economic Dispatch of Energy Storage System for Micro-Grid

Energy Storage Systems(ESSs) have critical impacts on the reliability and economy of micro-grid operation. In this paper, the control strategies of ESSs for a micro-grid in both grid-connected and islanded modes are analyzed. In order to solve the severe stability issues caused by high R/X ratio of line impedance in traditional voltage and frequency droop controls, an improved droop control strategy is designed that can enhance micro-grid transient performance by mitigating power fluctuation. A mathematical model of economic dispatch of ESSs is established under the time-of-use pricing, with which peak load shaving can be achieved. The proposed strategies in control and dispatch are verified through a study case.