暂态稳定混合控制的优化:（二）不同失稳模式的故障集

改善某个失稳模式(UM)故障稳定性的预防控制可能损害其他UM故障的稳定性，因此在研究单一UM故障约束的混合控制优化的基础上，必须妥善协调不同UM故障约束的混合控制。文中通过在出力成本中引入紧急控制代价的途径，将该协调问题转换为不同出力成本机群间的经济调度问题。各UM之间的拓扑关系可能非常复杂，但“解耦迭代(局部优化)，聚合协调(全局优化)”的思路却相同，因此，构造了不同UM的故障约束下混合控制的协调模型及其寻优算法，通过算例验证了该算法的有效性。

OPTIMAL HYBRID CONTROL OF TRANSIENT STABILITY Part Two For Cases with Different Unstable Modes

Part I of this two part paper develops an optimal algorithm for transient stability control to coordinate preventive actions and emergency actions for a subset of contingencies with the same unstable mode. In this part, the cases of several subsets of contingencies with different unstable modes are dealt with. Some preventive actions benefiting a subset of contingencies may go against the stability of others; thus coordination among the optimal schemes for individual subsets is necessary. The coordination is achieved by properly replacing preventive actions with emergency actions for some individual subsets. It is formulated as a classical model of economic dispatch with additional generating costs due to the emergency actions. Such an optimal algorithm is proposed based on the algorithm in the Part I and verified by simulations on a Chinese power system. This work was supported by National Key Basic Research Special Fund of China (No.G1998020301), National Natural Science Foundation of China (No.59920037), State Power Corporation (SP11 2001 01 04 01) and City University of Hong Kong (Project Number 9380026).