Analytic Approximation of Fault Current Contribution From AC Networks to MTDC Networks During Pole-to-Ground Faults
Analytic Approximation of Fault Current Contribution From AC Networks to MTDC Networks During Pole-to-Ground Faults
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DOI：
10.1109/tpwrd.2015.2401056
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发表时间：
2016-02
影响因子：
4.4
通讯作者：
M. Bucher;C. Franck
中科院分区：
文献类型：
--
作者：
M. Bucher;C. Franck
HVDC短路计算标准将被要求简化未来HVDC网络中断路器（CB）的尺寸和选择。本文提出了新的分析公式计算的交流侧的贡献，通过阻塞的半桥换流器在多端高压直流电缆网络的极对地故障。解析近似推导出的稳态短路电流和瞬态响应的峰值点到点HVDC链路和扩展到多端HVDC电缆网络与任意电网拓扑结构。所提出的表达式的结果进行了比较与PSCAD中的模拟，并提供准确的计算的瞬态峰值和稳态值的交流侧故障电流的贡献，以预期的CB电流。
HVDC short-circuit calculation standards will be required to simplify the dimensioning and selection of circuit breakers (CBs) in future HVDC networks. This paper proposes new analytical formulas for the calculation of the ac-side contribution through the blocked half-bridge-based converters during pole-to-ground faults in multiterminal HVDC cable networks. Analytic approximations are derived for the steady-state short-circuit currents and the peak of the transient response for point-to-point HVDC links and extended to multiterminal HVDC cable networks with arbitrary grid topology. The results of the proposed expressions are compared with simulations in PSCAD and provide accurate calculations for the transient peak and steady-state values of the ac-side fault current contribution to the prospective CB current.