Cascade distribution static synchronous compensator for impulse load compensation in the distribution network

A relocatable cascade distribution static synchronous compensator (D-STATCOM) is presented to meet the power quality requirement of distribution network when impulse loads connecting. Operating with switching capacitor branch, the compensator realizes the synchronous compensation of reactive power. As the example of the application in Jiangxi power grid, the compensation requirement of electric arc furnace which is typical impulse load was analyzed. With field wave recording data and distribution system parameter, simulation model was built. By using frequency dividing coordination control method, the active power compensator can work with switching capacitor branch perfectly. It reduced the dynamic capacity requirement of the compensating system effectively. The active power compensator realized moveable by accepting the cascade main circuit and modularization design. The field application plan of the equipment was put forward. The system parameter configuration method and principle were also given in detail. The operation effect shows that with the fast responding speed and working stability, the equipment can meet the compensation requirement of Var shock in distribution network.