Application of bidirectional power converters to overcome some disadvantages of SVC substation

When the authors research on the fact that some SVC (static var compensator) substations connected at some buses in power system, they realized that sonic main functions ensured to operate well. Those are: compensate reactive power following value according to the requirements of the Vietnamese power system dispath center, flit harmonic by passive filter_ However, it still has some disadvantages of this substation that need to be overcome: use large number of main devices, generate harmonics by itself, cause a lot of active power losses. Thus, the authors have an idea to solve these problems by applying a bidirectional power converter with having difference circuit structure and PWM (pulse width modulation) controller with SVM (space vector modulation) pulse generated section, so compensative current which is created by inductance element can be reserved, adjust continuos and always has full sinusoidal form, not generating harmonic. The benefit of this new solution is to eliminate the three above fundamental disadvantages. This new model is built based on authors' research about BESS (battery energy storage system). The research results have been verified by simulations in Matlab/Simulink software.