考虑负序零序非线性求解的三相潮流计算方法

THREE PHASE POWER FLOW SOLUTION BASED ON NODE INJECTION CURRENTS

提出了节点注入电流的三相潮流分析方法。三相潮流问题被转换成3个独立的电流方程。对其同时应用Newton-Raphson方法,修正方程的系数矩阵由起始节点电压决定,在迭代过程中保持不变。与已有方法相比较,所提方法不仅在正序方程中,而且也在负序和零序方程中采用牛顿法修正方程。实例表明该方法对三相不平衡功率具有很好的鲁棒性。随着不平衡功率的增大,该方法能够大幅度地减少迭代次数和时间。

This paper proposes an injection current based three phase power flow method. The original three phase power flow problem is transformed into three independent sequence current equations. The Newton-Raphson method is applied on three separate current equations, the coefficient matrices of updating equations is set to be constant, calculated by using the starting node voltage values. Compared with the previous methods, the Newton-Raphson method is used not only for solving the positive equation, but also the negative and zero sequence equations. Samples show that the proposed method is very robust for unbalanced power, while other power based methods are sensible to the degree of unbalance. The method in this paper can substantially reduce the iteration number and time.