储能电站参与电网稳态调压的控制策略

Control Strategy of Energy Storage Power Station Participating in Steady State Voltage Regulation of Power Grid

为改善电压质量、提升储能电站利用率,提出一种储能电站参与电网稳态调压的控制策略。基于简化的储能数学模型、电压-无功量化关系和负荷模型的静态电压特性,构建一种面向电网需求的长时间尺度储能调压动态模型;基于特征量提取实现对电网运行状态感知与研判,采用时序配合法协调控制离散无功源与储能电站参与电网调压,以某变电站实际工况验证了策略的有效性。结果表明,所提策略能发挥储能电站连续、快速的无功出力特性与电容/电抗器大容量优势,实现储能电站与传统调压手段的联合调压,避免电容/电抗器的频繁投切。

In order to improve the voltage quality and the utilization rate of energy storage power stations,a control strategy for energy storage power stations to participate in the steady-state voltage regulation of the power grid is proposed.Based on the simplified energy storage system mathematical model,the voltage-reactive quantitative relationship between voltage and reactive power and the static voltage characteristics of the load model,a long-term dynamic model of energy storage voltage regulation oriented to the grid demand is constructed.Based on the feature extraction,the realization and judgment of the power grid operation state,the time series coordination method is used to coordinate the control of discrete reactive power sources and energy storage power stations to participate in the voltage regulation of the power grid.The actual data of a substation is used as an example to verify the effectiveness of the strategy.The strategy fully utilizes the continuous and rapid reactive power output characteristics of the energy storage power station and the large capacity of the capacitor/reactor,realizes the joint voltage regulation of the energy storage power station and the traditional voltage regulation method,and can avoid the frequent switching of the capacitor/reactor switch.