电力系统故障限流超导电缆的阻抗选择

Impedance Selection of Power System Fault Current-limiting Superconducting Cable

与传统交流电缆相比,高温超导电缆由于具有较低的阻抗,在故障条件下会产生更大的故障电流,为了减小故障电流,就需要增大电缆阻抗值,故提出了一种超导电缆在故障条件下的系统阻抗选择方法。根据超导电缆在电力系统中的运行情况,得到它在故障条件下的阻抗变化。针对超导电缆特性,分析了超导电缆对电力系统保护的影响。最后通过数值模拟仿真证明了提出的超导电缆在故障条件下的系统阻抗选择方法的有效性,选择高温超导电缆的最优阻抗值为0.1Ω。

Compared with the traditional AC cable, high-temperature superconducting cable due to the lower impedance, in the fault conditions will produce greater fault current, in order to reduce the fault current, you need to increase the cable impedance value, so the proposed a super System impedance selection method for conductor cable under fault condition.According to the operation of the superconducting cable in the power system, it obtains it's impedance change under the fault condition.According to the characteristics of superconducting cable, the influence of superconducting cable on power system protection is analyzed.Finally, the effectiveness of the proposed system impedance selection method under fault conditions is proved by numerical simulations,the optimum impedance of HTS cable is 0.1.