Shunt reactor is an important element to ensure the safe and stable operation of ultra-high voltage (UHV) power grid. Based on uniform transfer equation, π-type UHV equivalent circuit without conductance, which is considering the distributed parameter characteristics of UHV transmission lines and excluding the conductance of UHV transmission lines, is derived in this paper. According to Jiangxi UHV accessed scheme and taking Hubei-Jiangxi UHV substation as an example, the relationship of shunt reactors with UHV steady-state voltage and transient voltages is obtained based on ADPSS real-time simulation system using electromechanical and electromagnetic hybrid simulation method. Influence of different mounting position of shunt reactors and different degree of compensation on UHV steady-state voltage and transient power frequency overvoltage is analyzed. The meaningful guidance for the plane and construction of Jiangxi UHV power grid is provided.
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