Study Of Static Synchronous Compensator Controller

Var compensation is necessary in maintaining stability and economy of modern power system. It has been more than twenty years since Static Synchronous Compensator was developed. STATCOM is an important Var compensator applied in Flexible AC Transmission System (FACTS) and it is the direction in static Var compensator technology.This paper summarizes the development of STATCOM, studies its principle and analyzes the application of the instantaneous reactive power in STATCOM. By theoretical analysis, the steady model and the dynamic model for STATCOM are deduced. A novel strategy combined the Fuzzy Logic of linear multivariable feedback control to design a controller of STATCOM to meet the multi-objective demands of power systems is also proposed in this dissertation, and the controller is designed with this strategy, because of variational element, nonlinearity and multi-objective controlling demands of STATCOM, this paper designs the controller respectively aimed at continuous linear control for voltage maintaining, oscillation damping, improving the transient stability . Results of Simulation based on a single machine to infinite bus system show that the controller has better performance than traditional PI controller in the power system, and makes STATCOM exert its control effect sufficiently under any circumstance.Finally, the controller based on DSP (TMS320F240) is designed in this dissertation, and the communication between the controller and the pulse generator was achieved with dual-port RAM, so the control strategy of total digitization is realized really.