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。

多代理(Multi-Agent)技术在电力系统控制中的应用

多代理系统理论是设计和实现复杂软件系统和控制系统的新途径,它因适用条件与电力系统的特征几乎完全吻合而受到众多学者的关注,但在电力系统中仍处在理论和应用的边缘。在介绍多代理系统理论基本特点的基础上,综述了其在电力系统控制中心、继电保护系统、电压无功控制以及暂态稳定紧急控制等领域应用的国内外研究现状,展望了最具实用化潜力与基础较完备的分支,以推动多代理技术在这些领域的广泛应用。

Fast emergency control strategy calculation based on dynamic equivalence and integral sensitivity

To simplify the transient stability analysis of a large-scale power system and realize real-time emergency control,a fast transient stability simulation algorithm based on real-time dynamic equivalence is proposed.Generator models are grouped and aggregated according to a fast numerical integration.A fast calculation method of the admittance matrix is then proposed to calculate the parameters of an equivalent system,and numerical integration is performed using the obtained equivalent system.Then,based on integral sensitivity,a new fast emergency control strategy is proposed for the equivalent system.The final emergency control strategy is obtained by mapping the control strategy for the equivalent system back to the original system.The results of a simulation on an East China Power System that includes 496 generators and 5075 buses show that the suggested algorithm can output an accurate transient stability simulation result and form an effective emergency control strategy.The proposed algorithm is much faster than the existing solutions and has the potential to be used for online pre-decision.