电力系统不对称运行计算方法的研究

On Calculation Methods for Asymmetric Operation of Power Systems

在三相电力系统分析和计算中,由于电路存在互感或发生故障而导致三相电路不对称,加大了系统网络分析和计算的难度。采用“相分量法”建立电网各种不对称条件下的无互感等值电路,通过修改故障前的电力网络中的节点导纳矩阵,列出网络方程,求解各点电压和电流值。“相分量法”对分析存在互感或发生故障等不对称网络有效,不受网络参数对称与否的限制,拓宽了电力系统不对称电路的计算方法,简化了计算过程。算例演示了计算步骤和方法,表明该方法是分析线路存在互感、短路或断路不对称运行计算的一种有效的方法。

In the analysis and calculation of three phase power system,the asymmetry of three-phase circuit caused by mutual inductance or fault in the circuit increases the difficulty of system network analysis and calculation.The"phase component method"is used to establish the non mutual inductance equivalent circuit under various asymmetrical conditions of the power grid.By modifying the node admittance matrix in the power network before the fault,the network equation is listed to solve the voltage and current values at each point.The"phase component method"is effective for analyzing asymmetric networks with mutual inductance or faults.Unlimited by the symmetry of network parameters,it broadens the calculation method of power system asymmetric circuits and simplifies the calculation process.The calculation steps and methods are demonstrated by an example,which shows that the method is effective for analyzing the asymmetric operation of lines with mutual inductance,short circuit or open circuit.