负荷对短路电流的影响研究  

Research on the influence of load on short circuit current

作　　者：李勇[1] 于芮技 王英英 李银红[2] 谢俊[1] 李锋[1] 

机构地区：[1]华中电网有限公司,湖北武汉430074 [2]华中科技大学强电磁工程与新技术国家重点实验室,湖北武汉430074

出　　处：《电力系统保护与控制》2015年第6期40-45,共6页Power System Protection and Control

摘　　要：分析了现有标准规范以及文献中对于负荷的处理方法,提出利用故障模型模拟不同类型负荷,基于补偿方法计算计及负荷的短路电流,并定义了电压、电流变化量指标。利用上述指标,得出负荷接入点位置、负荷水平等影响系统电压电流的一般性规律。提出了计及多负荷的快速补偿短路电流计算方法,该方法避免了对原有网络矩阵的修改,减少了短路电流计算时间。最后用IEEE9节点算例验证了相关规律和结论,并建议利用提出的指标和方法,在短路电流计算中适当取舍负荷。The method of load in standards and documents is analyzed, then different types of load are simulated by fault model. Based on compensation method, short circuit current is calculated considering load, and the voltage and current variation index are defined. With the variation index, the influence of load location and load level on the grid voltage and current is concluded. The fast method of compensating short circuit current calculation considering multiple load is proposed, the original network matrix is not modified and the time of short circuit current calculation is reduced by the method. Finally, IEEE9 node example is provided, it is suggested to use the method and index to select load on short circuit current calculation.

关 键 词：故障模型 变化量指标 短路电流计算方法 负荷接入点位置 多负荷 

分 类 号：TM713[电气工程—电力系统及自动化]