电力系统低频振荡期间对三相短路故障的识别OA

A new symmetrical fault detection method for distance protection is proposed to maintain the selectivity of the protection device and overcome some shortcomings of the original protection latching algorithm.Firstly,the preprocessing process of the sampled data and the method of extracting the current waveform components using the matrix beam algorithm are briefly introduced.Secondly,an algorithm for judging faults by detecting the DC component in the current is proposed.Finally,the true reliability of the algorithm is verified by PSCAD simulation of various faults and system oscillations.The results show that this algorithm can effectively identify the three symmetrical short-circuit faults that occur during the oscillation of the system,and can be used to monitor the operation of the distance protection device of the power system under the condition of low-frequency oscillation.