面向恢复过程的环网并列合闸角两步调控方法

基于投入负荷和增加发电机有功出力之间的相互牵制关系,提出了一种面向恢复过程的环网并列合闸角两步调控方法。根据重要性和对减小合闸角的灵敏度确定负荷的恢复顺序,通过非线性规划求解得到与投入负荷相对应的有功发电增加量。两步调控策略能详细描述以投入负荷和增加发电机有功出力为控制变量的合闸角调控过程。在快速完成调控目标的同时,恢复了部分重要负荷,提高了系统恢复效率,加快了恢复进程,减小了停电损失。山东电网临沂—日照分区子系统的仿真结果表明,该方法能够得到与分支定界算法基本一致的调控策略,参与调整的发电机数量少,出力调整量小,可为系统运行人员提供面向恢复过程的决策支持。

Restoration Process Oriented Two-Step Method for Standing Phase Angle Reduction in Transmission Loop Paralleling Operation

Based on interactions between active generation increment and load restoration,a restoration process oriented two-step method for standing phase angle(SPA) difference reduction in transmission loop paralleling operation is proposed.The importance and sensitivity of SPA reduction with respects to load is used to determine its restoration sequence.Minimum active generation increments corresponding to restored load are obtained by nonlinear programming.Control strategies obtained by the two-step method can depict the detailed process of SPA reduction which uses active generation increment and load restoration as control variables.The SPA can be reduced to the allowable limit in a short time,and some important load can be restored concurrently.Thus power system restoration efficiency is improved and the progress is speeded up.The loss of system outage is hence reduced.Simulation results of Linyi-Rizhao subsystem in practical Shandong power system shows that the method can obtain nearly the same control strategies as the branch and bound algorithm.The participated generators are fewer and adjustment of active generation is smaller.Thus it can provide system operator with restoration process oriented decision-making support.