A new combination of Shunt Hybrid Power Filter and Thyristor Controlled Reactor for harmonics and reactive power compensation

This paper proposes a new combination of a three-phase shunt hybrid power filter (SHPF) and a thyristor controlled reactor (TCR) for compensating harmonic currents and reactive power. The SHPF consists of a small-rated voltage source inverter (VSI) in series with a 5
^th
harmonic tuned LC passive filter. The rating of the VSI in the SHPF system is much smaller than that in the conventional shunt active power filter because the passive filter takes care of the major burden of compensation. The task of reactive power and harmonic compensation is shared by the combination of the SHPF and the TCR. The tuned passive filter and the TCR form a shunt passive filter (SPF) to compensate reactive power and consequently the SHPF is used to eliminate harmonic currents. The control of the SHPF is based on a nonlinear control technique method. The dynamic model of the SHPF system is first elaborated in the stationary `abc' reference frame and then transformed into the synchronous orthogonal `dq' reference frame. Proportional-integral (PI) controllers are utilized to control the SHPF input currents and dc-bus voltage. The proposed combination provides the reactive power and harmonic currents required by the nonlinear load, thereby achieving sinusoidal supply currents in phase with supply voltages under dynamic and steady state conditions. The simulation results are discussed, and the performance of the topology is therefore evaluated.