有牵引负荷的电力系统多相网络计算方法

Multiphase Network Calculation Methods for Power System Including Traction Load

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。

It is necessary to calculate the power flow and network voltage of steady state unbalanced power system in order to estimate the effects of unbalance in the system caused by railways. This paper presents the phase coordinate methods of harmonic calculation, fault analysis and power flow calculation of steady state unbalanced power system, The phase coordinate methods which express the network states by phase variables are more flexible and directly observable comparing with the traditional symmetry component method and single phase power flow calculation. System elements of any phases system and simultaneous complex faults can be modeled. Power system including various elements can be analyzed. Calculation examples for power flow and harmonic voltages of multiphase power system are presented. It is proved that the phase coordinate methods are more efficient in analysing steady state unbalanced power system and estimating the effects of unbalance in the system caused by railways.