中文摘要：

由于参数不对称元件和不平衡负荷的存在,电力系统中可能出现三相不对称运行的情况。为此,文中提出一种新的不对称电力系统三相潮流计算方法。该方法采用相序混合建模方法对电网建模,并采用分解协调方式实现全网三相潮流的求解。所述方法兼具相分量法的灵活性和对称分量法的计算高效性,适用于输电网和中高压配电网三相潮流分析和故障计算。针对不同规模的IEEE标准算例的测试表明,所提出的算法具有较高的正确性和收敛性,且各项性能不受不对称情况严重程度的影响。

英文摘要：

Because of the existence of asymmetrical parameters and unbalanced loads,a power system may operate in an unbalanced state even if there is no fault in the system.A new three-phase power-flow method for asymmetrical power systems power flow calculation is presented.This method uses a hybrid approach with symmetrical components and phase components to model the system,and solves the power flow through decomposition and coordination algorithms.The algorithm proposed combines the flexibility of phase component method and the efficiency of symmetrical component method.It is suitable for power flow and fault calculation of transmission systems as well as high/medium voltage distribution systems.Three IEEE standard systems with different size and a real system are used for case study.Test results show that the method proposed has high accuracy and convergence,and has low sensitivity to the system unbalance.