连锁过载识别方法的比较

Comparative Research on Identifying Method of Cascading Overload

通过合理的近似假设,对追加电流源补偿法做了进一步改进。与牛拉法的潮流计算结果比较可知,两种方法的误差水平相当。由于两种方法应用的都是叠加原理,而连锁过载识别是一个连续的分析过程,因此在第一次开断时,潮流计算的误差很小,但随着故障阶数的升高误差会迅速增大。仿真分析可以看出,故障阶数应控制在三阶以内,重负荷情况下,误差对开断顺序的影响较大,这也是两种方法应用的局限性。通过对数据进行误差分析可知,误差主要体现在无功功率方面。

To identify cascading overload quickly and effectively is the precondition of preventing cascading overload The compensation method of add-on current supply is improved to save resources of computation through rational approximation in the paper, which can be called power flow distribution method. The power flow computation result of two methods respectively compare with the result of Newton-Laphson method. Their error is in the same level. Identifying cascading overload is a continuous analysis process Because the two methods are based on superposition theorem, the error is little when the first line broke, and the error rise quickly following failure order. It is to know that the failure order should be below three orders through simulating cascading overload, and the error affect breaking order more seriously when to be heavy load, which is the limitation of application. It is to know that the error is mainly from reactive power through data analysis.