Research and design about the neutral reactors compensation on UHV double-circle lines

This paper discusses the theory of the neutral reactors compensation of shunt reactor on UHV (ultra high voltage) double-circle lines and offers the calculation formulas of 4 connection types of neutral reactor compensation schemes. Using Huainan-Shanghai UHV double-circle line as an example, the value range of neutral reactor for existing compensation scheme in this project was obtained. According to main technical index (secondary arc current, extinguished time) simulated by PSCAD /EMTDC, choose the optimum parameters from the value range of neutral reactor. Based on the optimum parameters, secondary arc current of these 4 types of compensation schemes are carried out in the case of different fault locations and different fault types. By synthetically comparing and analyzing, the optimum scheme can be achieved, and then an effective and economical hybrid scheme will be recommended to give the designer a reasonable and valuable reference.