The Study, Based On The Tsc + Of Statcom Reactive Power Compensation Control Strategy

Reactive power imbalance will result in voltage sag and the damage of electro-equipment. The power system voltage will collapse and the stability accident will be happened if aggravation. TSC is a widely used reactive compensation method. It has advantages of simple configuration and low cost. STATCOM has ascendant dynamic feature. Combine the both devices, on the premise of meet the necessary of dynamic properties. If let TSC replace part capacitance of STATCOM, the cost will be reduced.The thesis introduces the fundamental structure and principle of TSC and STATCOM, establish the mathematical model and analyze the stability of STATCOM, and discuss the methods to reject self harmonic. Secondly, the control strategy is confirmed after analyze the characteristic of TSC and STATCOM. The control target of TSC is reactive power, and the control target of STATCOM is voltage. The most reactive power is compensated by TSC, STATCOM compensate the part of dynamic change. When design the control method of TSC+STATCOM, arm at the defect of nine-zone controlling method of TSC, the fuzzy control is adopted. Proceed from the principle of STATCOM, current remoteness control method is adopted after reasoning from the mathematical model.The TSC+STATCOM are researched in the MATLAB/SIMULINK environment. The fuzzy logic toolbox is used to design the fuzzy control system of TSC, the result of simulation verified the validity of the control algorithm, also can increase the stability of system and reduce the action times of capacitor. The simulation model of TSC+STATCOM is established by using SIMULINK, through analyzed the simulation waveform diagram, the result indicates that TSC+STATCOM reactive compensation can meet the demands of increase the reactive factor, reject self harmonic and stabilize the system voltage, and show the reactive compensation method has great application value.