远程电压控制模式下的潮流计算

Power Flow Solution With Remote Voltage Control

根据2种类型3种模式下的远程电压控制的特点,在引入新的P节点和PQV节点类型后,建立3种远程电压控制模式下潮流计算模型。在第1种一对一无功注入模式下,P节点的电压约束被PQV节点的电压所约束,各种节点类型的约束方程能保证潮流的可解性;在第2种多对一的无功注入联合控制模式下,引入控制节点的无功分配方程约束来保证潮流的可解性;第3种调压器控制模式下,将调压器变比作为待求变量,从而将控制变量的求取集成到潮流解算的过程之中。推导各种控制模式下利用牛顿–拉夫逊算法求解方程组时雅克比矩阵和修正向量表达式,并分别分析其特点。算例表明,所提出的方法收敛性和收敛速度能得到保证,具有很好的应用前景。

Load flow models of three patterns in two types were established according to characteristics of each model, while introducing two new bus types, P type and PQV type. As for first pattern, i.e. one-to-one control model through reactive power injection, the voltage constraint of P bus is replaced with the voltage constraint of PQV bus. The constraint equations of all bus including the new bus types is enough for solution, but for the multi-to-one model, reactive power distribution equations are required. The third model realizes remote voltage control through voltage regulator or load tap changing transformer （LTC）. The taps are set to be variable, which integrates the solution of control variable with the power flow solution. The expressions of Jacobian matrix and modification vectors while using Newton-Rapshon method for solution were given, and both characteristics of them were analyzed. The test result implies the method proposed is effective and has good application foreground.