Improvement and promotion of voltage qualification rate in distribution network is a hot issue re-cently in China’s power grid

and medium voltage series compensator is a new device for solving this kindof problems. In this paper

based on the structure and operating principle of medium voltage series compen-sation device

the simulation model is built and theoretical study from such aspects as degree of compensa-tion

installation location and bidirectional voltage compensation result is performed

and the method onparameter design of the device and installation position optimization is proposed. The results studied are ap-plied to engineering examples

and the cautions in the engineering application are discussed

which canprovide reference for engineering application of medium voltage series compensation device.