| Abstract |
This paper describes three kinds of new VSSG (voltage sag and swell generator) suitable to the
evaluations of high power custom power devices such as DVR (Dynamic Voltage Restorer) and
DSTATCOM (Distribution Static Compensator). Proposed systems are designed to generate the
several power quality disturbances in MVA power ratings – sag, swell, under voltage, over voltage
and harmonic distortions. We can generate the power disturbances by injecting a controlled series
voltage through series transformer in a power supply line. Conventional solid-state switched tap
changer was modified to minimize the harmonic contents in the injected voltage.
In this paper, we calculated the harmonic spectrums of three kinds of sag and swell generator.
Additional comparisons are given for the power ratings of power devices and other components. We
adopted a very simple control method to verify the operation of the proposed systems and to get the
various sag, swell and distorted voltages. Simulation results are given for the typical patterns of sag
and swell voltage. Finally, conclusions are given. |
