An anti-misoperation method for intermediate relay used in DC system of substation

This paper analyzes the characteristics of various faults in the DC system of the substation. An improved method of the traditional recursive wavelet basis is studied by optimizing the corresponding Z transform parameters. Then a method is presented to avoid the anti-maloperation of intermediate relay of the DC system based on the improved recursive wavelet. The control algorithm is verified by MATLAB simulation. And, DSP TMS320F28335 is used to check the running time of the algorithm. The result shows that the method proposed in this paper is able to solve the problem of the misoperation of the intermediate relay effectively.