逆变侧交流系统三相短路时直流系统贡献短路电流的机理和计算方法研究

发布时间：2018-07-05 13:53

本文选题：交直流混联系统 + 短路故障　；参考：《电网技术》2016年05期

【摘要】：随着直流输电系统的迅速发展,能否忽略直流系统对短路电流的贡献成为一个亟待解决的问题,国际电工委员会把研究三相交流系统短路故障时直流输电系统对短路电流的贡献列入了5年工作计划。针对这一问题,研究了交直流混联系统中逆变侧交流三相短路故障后,直流系统发生换相失败的暂态过程;分析了直流系统向交流侧贡献短路电流的机理和特性;得出了当直流输送功率较大时不能忽略直流贡献短路电流,且只影响短路电流峰值的结论;给出了一种基于分段函数的直流系统贡献短路电流的实用计算方法。最后通过仿真计算验证了文中所给出的机理和计算方法的正确性。
[Abstract]:With the rapid development of HVDC transmission system, it is an urgent problem to ignore the contribution of DC system to short-circuit current. The International Electrotechnical Commission (IEC) has included the contribution of DC transmission system to short circuit current in the short circuit fault of three phase AC system for 5 years. In order to solve this problem, the transient process of commutation failure in AC / DC hybrid system is studied, and the mechanism and characteristics of DC system contributing short circuit current to AC side are analyzed. It is concluded that the DC contribution short circuit current can not be ignored and only the peak value of the short circuit current can be affected when the DC transmission power is high, and a practical calculation method of the DC system contribution short circuit current based on the piecewise function is given. Finally, the mechanism and calculation method presented in this paper are verified by simulation.
【作者单位】：中国电力科学研究院;
【基金】：国家973计划项目(2013CB228203) 国家电网公司科技项目(CEPRI:XT71-14-042)~~
【分类号】：TM721.1;TM713

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