断相加短路故障计算的等值双端电源相分量法

Equivalent two-source phase-domain method for open conductor plus short circuit fault calculation

提出了一种含有固态限流器的电力系统断相加短路故障计算的等值双端电源相分量法。首先,给出一种新的断相加短路故障的模拟方法。该方法在相坐标下,通过在虚拟故障端口与大地之间连接一条阻抗支路模拟固态限流器和短路故障,在虚拟端口之间连接一条阻抗支路模拟断相故障。然后,基于二端口网络理论,将复杂网络简化成仅含有2个节点的双端电源等值电路,利用相序变换技术,在相坐标下将断相加短路故障模拟成等值的双端电源节点之间的连接。所提方法的主要特点在于:可方便地计及固态限流器和故障点的接触电阻的影响;取消了复杂的序网连接。算例表明:该方法是分析含有固态限流器的电力系统断相加短路故障计算的一种有效的方法。

Equivalent two-source phase-domain method is proposed to calculate the open conductor plus short circuit fault for power system with solid-state fault-current limiter.A new simulation method is presented,which adds an impedance branch between virtual fault point and ground in phase domain to simulate the solid state fault current limiter short circuit fault and another impedance branch between virtual fault points to simulate the open conductor fault.The two-port network theory is applied to simplify the complicated power network into a two-source equivalent circuit with only two nodes,and the phase-sequence parameter transformation technique is applied to simulate the open conductor plus short circuit fault as the connection in phase domain between two nodes of two-source network.The proposed method has two features：the influences of solid-state fault current limiter and fault point resistance are easily taken into account and the complex connections between sequence networks are avoided.Case calculation shows its effectiveness.