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为解决传统低频切泵策略简单将抽水蓄能机组当成负荷处理以及对电网频率不能实时跟踪控制带来的问题,将抽水蓄能切泵工况转换动态模型计入到电网频率动态过程中并对故障过程进行实时频率跟踪确定故障规模及频率的动态轨迹。通过最优频率轨迹思想建立切泵策略的目标函数并根据动作范围给出约束条件。引进外点罚函数法进行优化求解给出了抽水蓄能机组实时切泵策略。通过PSASP软件对某省电网进行仿真验证得出,所提实时切泵策略能有效且更好地达到控制效果。这为首次将抽水蓄能机组用于实时切泵策略提供了系统理论基础和现实的应用方案。
In order to solve the problem that the traditional low-frequency cutting pump strategy simply treats the pumped storage unit as a load and the problem that the grid frequency can not be tracked in real time, the dynamic model of pumped storage pump operation is taken into account during the dynamic process of the grid frequency. Fault process real-time frequency tracking to determine the size and frequency of the dynamic trajectory. The objective function of the pump strategy is established by the idea of optimal frequency trajectory and the constraints are given according to the range of motion. The introduction of external penalty function method to optimize the solution given pumped storage unit real-time pump strategy. Simulation results of a provincial power grid by PSASP software show that the proposed real-time pump-cut strategy can effectively and better achieve the control effect. This provides the theoretical basis and practical application scheme for the first time that the pumped storage unit is used for the real-time pump cutting strategy.