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在计算电气化铁路不平衡负荷对电力系统的影响时,需要进行稳态非平衡三相系统的潮流计算和网络计算。本文阐述了在相坐标系进行稳态三相电力系统的谐波计算、故障分析和用牛顿-拉夫逊法解三相负荷潮流的方法,用相变量表示多相系统的网络状态,比以往采用的对称分量法和单相负荷潮流法灵活、直观,能模拟任何相数的系统元件和同时发生的任何数的复杂故障,能分析包含任何相的混合多相系统。本文举例对包含电气化铁道供电系统的混合多相系统进行了负荷潮流计算和网络计算,计算结果表明,该方法是分析稳态非平衡三相电力系统,计算电气化铁路非平衡负荷对电力系统影响的更有效的方法。
In calculating the impact of unbalanced loads on the power system due to the electrified railway, the power flow calculation and network calculation of the steady-state unbalanced three-phase system are needed. In this paper, the harmonic calculation, fault analysis and the method of solving three-phase load flow in steady-state three-phase power system in phase coordinate system are described. The phase change is used to represent the network state of multi-phase system, The symmetrical component method and single-phase load flow method are flexible and intuitive, capable of simulating system elements of any phase and complex numbers of any number of simultaneous faults, enabling analysis of mixed heterogeneous systems containing any phase. In this paper, load power flow calculation and network calculation are carried out for a hybrid multiphase system including electrified railway power supply system. The calculation results show that this method is to analyze the steady unbalanced three-phase power system and calculate the influence of the unbalanced load of the electrified railway on the power system More effective way.