Aimed at the problems of imperfect function and low reliability of pumped storage units relay protection,an intelli-gent differential protection control strategy for generation and substation unit of pumped storage power station is proposed in this paper.The principle of longitudinal differential protection and transverse differential protection is analyzed,a frequency tracking algorithm based on short data window is designed to solve the problem of the existing frequency tracking algorithm,such as slow calculation speed and low accuracy.An adaptive intelligent differential protection control strategy is designed,combined with fault component current differential protection,full current differential protection,zero sequence current and negative sequence current protection.The simulation results show that the proposed intelligent differential protection control strategy can accurately and reliably disconnect the internal faults of the unit,and effectively avoid the mis-operation of external faults of the unit.In the practical application of pumped storage power station,the control strategy designed in this paper can improve the action reliability of relay protection device with a reduction in the proportion of the unreliability action from 1.48％to 0.64％.
关键词
差动保护/自适应调节/频率跟踪算法/发变电机组
Key words
differential protection/adaptive control/frequency tracking algorithm/generation and substation unit
维普
万方数据