MSVC based multi-side coordinated reactive compensation capacity configuration and voltage/var control in substation

Nowadays, Automatic voltage and reactive power coordinated control system is mainly applied to two-voltage-level substations with voltage rating of 110kV or below, aiming at controlling voltage of the low-voltage (LV) side and the power factor of the high-voltage (HV) side. Static var compensation in 220kV substations with a three-winding transformer is to improve voltage quality of the LV or medium-voltage (MV) side, as well as voltage quality and reactive power balance of the HV side. Nevertheless, this method does not take into account the overall voltage quality of the whole substation. This paper offers a new approach of voltage and var coordinated control and a new method of reactive power compensation capacity configuration based on MCR and MSVC. Considering the interaction between each side of the transformer, we focus on the bus voltage of three side and the power factor of the HV side. Simulation model based on Matlab/Simulink is established, consisting of two main transformers, and MCR is at the MV side and MSVC at the LV side. Simulation results indicate its effectiveness in reactive power compensation capacity configuration and in achieving qualified voltage at each side and general reactive power balance under different operating modes.