Ahsrracf--This paper describes a new economical sag/swell voltage generator suitable to the evaluations of high power custom power devices such as DVR (Dynamic Voltage Restorer) and DSTATCOM (Distribution Static Compensator). Proposed system Bas designed le generate the several power quality disturhances in MVA power ratingssag, swell, under voltage, over voltage and harmonic distortions. The sag and the under voltage can be generated by voltage dmp across a reactor, while its magnitude and durations can he controlled by the firing angle of TCR (Thyristor Controlled Reactor). In the case of the swell and the over voltage, we need a step-up transformer. Output of the step-up transformer is regulated by TCR to obtain nominal voltage level. At any given instant, if the firing angle of TCR is retarded or stopped, then we can obtain the swell voltage or the over voltage disturbance. Also we can generate harmonic current hy controlling firing angles of TCR, while keeping the system voltage level within the specified limits.In this paper, two identical three-phase wye-connected TCRs are connected to the secondary windings of two step-down transformers, one operated from wye-wye transformer, the other from delta-wye transformer. Harmonic filters (Illh and 131h) are added to reduce the voltage distortion when TCRs are operated. Simulation results are given for several cases of voltage sag and swell generations. Design guidelines are given for the TCR. Finally, conclusions are given.
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