电力系统接地电阻精确测量仿真研究

发布时间：2018-11-11 07:31

【摘要】：对电力系统中接地电阻的精确测量,能够保证电力设备正常运行。接地电阻的精确测量,需要获取发电机输出电流增量的最大约束值,得到工频接地电阻计算方程,完成对接地电阻的精确测量。传统方法先组建一个电阻网络来等效实际接地网,将该问题进行转换,但忽略了工频接地电阻计算方程的求取。提出基于格林函数的电力系统接地电阻精确测量方法。上述方法通过附加接地电阻串联断路器的操作原理计算出接地电阻上的电流,计算出电流的平均绝对值需要满足的约束条件,采用电压下垂的励磁控制方式得到支路电流的增加量,获取发电机输出电流增量的最大约束值,得到工频接地电阻计算方程,利用格林函数方法计算各微段的电荷密度在任一点所产生的电位向量,利用边界条件求得电阻系数。实验结果表明,所提方法测量精度较高,为保障电力设备正常运行提供了可行的依据。
[Abstract]:The accurate measurement of grounding resistance in power system can ensure the normal operation of power equipment. The accurate measurement of grounding resistance needs to obtain the maximum constraint value of generator output current increment, and obtain the calculation equation of power frequency grounding resistance, and complete the accurate measurement of grounding resistance. The traditional method first constructs a resistance network to equivalent the actual grounding network, and converts the problem, but neglects the calculation equation of the power frequency grounding resistance. An accurate measurement method for grounding resistance of power system based on Green's function is presented. The above method calculates the current on the grounding resistance by the operation principle of the additional grounding resistance series circuit breaker, and calculates the constraint condition that the average absolute value of the current needs to satisfy. The voltage droop excitation control method is used to obtain the increase of branch current, the maximum constraint value of generator output current increment, and the calculation equation of power frequency grounding resistance. The potential vector generated by charge density at any point in each microsegment is calculated by Green's function method, and the resistance coefficient is obtained by using boundary conditions. The experimental results show that the measurement accuracy of the proposed method is high, which provides a feasible basis for ensuring the normal operation of power equipment.
【作者单位】：华侨大学信息科学与工程学院;
【基金】：华侨大学科研基金(10HZR04)
【分类号】：TM934.1

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