AC/DC系统潮流计算的部分直流变量消除法

Partial DC Variable Elimination Method for Calculation of AC/DC Power Flow

为克服AC/DC系统的潮流计算方法中的变量消除法的不足,提出了部分直流变量消除法.该方法的模型中将换流器等效为依赖于换流器端交流电压和控制角的PQ负荷.计算时,只需规定换流器直流侧的无功功率,而且当直流系统控制方式发生变化后不需重新推导Jacobian矩阵中的偏导公式.数值算例表明该方法具有较高的灵活性,与变量消除法相比计算效率可提高5%左右.

A partial DC variable elimination method for calculation of AC/DC power flow was to overcome the main disadvantages of the existing unified iterative methods. In its computational model, the converters are treated as PQ-loads that depend on the control angles and the voltages on the AC side. The DC reactive power is the only parameter to be specified in calculation, and the partial differential formulas in Jacobian matrix do not change when the DC control model changes. A numerical example shows that the proposed method has good feasibility, and its computational efficiency is raised by about 5% compared with the existing variable elimination method.