电力系统安全校正中的卸负荷控制

LOAD SHEDDING SCHEDULING FOR POWER SYSTEM SECURITY CONTROL

在电力系统安全分析有功校正对策中,可以通过发电机节点有功注入的再安排来消除支路的过负荷。近年来,较多地是采用线性规划(LP)的解算方法,借调节发电机功率为控制变量来进行安全校正控制。当预想事故比较严重或LP问题不可行时,增加卸负荷控制变量有可能获得可行解,但却导致了LP问题过大。为此,本文引用Dantzig-Wolfe分解原理,将原问题分解成两个较小的线性规划(即所谓的主问题和子问题)来进行有效的处理。经试验系统的数值分析证实,校正结果和耗用机时都比常规法优越。

For the security control of power systems, the line overload violations can be alleviated by the active power rescheduling. in which the corrective control is executed by adjusting outputs of generators. These outputs are considered as control variables in the Linea Programming method. But, the solution obtained by the LP method may be infeasible. if the contingencies are very severe. In order to acquire a feasible solution, load shedding scheduling can be introduced into the rescheduling as an additional control measure. It causes that the size of the LP problem becomes so larger that the CPU time needed is increased. For this reason, a novel algorithm using the Dantzig-Wolfe decomposition principle is proposed here. As a result, the originnal LP problem is decomposed into one master problem and one subproblem. each problem has much smaller size than the original one. Numerical testing result indicates that the aspects of solution effectiveness and computational time saving are superior to those given by the conventional LP method.