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适应大扰动的电力系统戴维南等值参数跟踪算法

, PP. 126-132

Keywords: 电力系统,戴维南等值,大扰动,全微分,跟踪算法

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Abstract:

针对现有的戴维南等值参数跟踪算法需要假设2个计算时步之间戴维南等值参数不变、不能适应等值系统内部发生扰动等问题,提出了一种可以适应系统内部出现大扰动的戴维南等值参数跟踪算法。该算法利用本地测量信息,主要解决了现有算法不能适应等值系统内部发生大扰动时戴维南等值参数计算问题,跟踪算法利用故障前的戴维南等值参数计算出故障时刻的等值电压源幅值,然后以故障前一时刻的等值电阻和故障时刻的等值电压源幅值作为初值,计算出故障时刻的其他戴维南等值参数,从而再求出故障后各个时刻的戴维南等值参数。该算法的优势在于仅利用负荷母线局部电气量就可以快速、准确、实时地求取戴维南等值参数,而且也适用于等值系统内部发生三相短路的情况,同时该算法具有计算结果误差小的优点。最后,通过IEEE30和IEEE39节点标准测试系统验证了本算法的准确性。

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