采用储能电源辅助的暂态稳定紧急控制方法

为减少切机量并使暂态稳定紧急情况得到有效控制,提出采取切机措施同时联合储能电源进行暂态紧急控制的策略。推导了含储能电源的系统三阶等值模型,基于反步法计算中间控制变量的控制律,并进一步设计储能电源装置的暂态稳定非线性鲁棒控制器。在扩展等面积法(EEAC)的基础上提出一种参考切机量的简化计算方法。提出通过切机组合优化算法选择最优切机组合并在切除机组的同时投入储能电源。基于含储能两区域系统近似等效模型分析储能有效控制时段并给出了退出时间的计算方法。利用PSASP 7.0用户自定义(UD)模型搭建储能电源及控制器模型并接入WEPRI 36节点系统中进行控制器及控制策略有效性的验证。仿真结果显示所设计的控制器能够有效提高系统暂态稳定性,所提出的策略和储能电源切除时间计算方法能够达到减少紧急控制切机量和储能充放电次数的目的。

Power System Transient Stability Emergency Control Method Assisted by Energy Storage

To reduce the generator-tripping capacity and control the transient stability effectively, this paper proposed a combined emergency controlling method using energy storage and generator-tripping. Based on the back-stepping, the control rates of middle control variable is deduced, and the nonlinear robust transient stability controller of the energy storage is designed. By the extended equal area criteria (EEAC) a method of generator-tripping capacity calculating algorithm is proposed. In order to choose the optimal generator tripping unit, this paper propose a generator tripping unit optimization algorithm. The energy storage cutting out time is deduced by the approximate equivalent system model. By PSASP 7.0 user defined (UD) model the energy storage and the controller model are built and connected to the WEPRI 36-bus system to verify the validity of the controller and control strategy. The simulation result shows that the designed controller can effectively improves the transient stability of the system. The proposed strategy and cutting out time calculation method can achieve the purpose of reducing the capacity of tripped generator as well as the frequency of energy storage charge and discharge.