Reduced voltage drop characteristics of the series transformer in a voltage disturbance generator

In this paper a new 3-phase voltage disturbance generator is proposed. Voltage sag, swell, outage, and unbalance can be provided by the proposed scheme. The main devices of the proposed generator are SCR thyristors, sliding type autotransformers, and transformers. Therefore, the generator has good features of high reliability, high efficiency, and low cost implementation with simple structure. Furthermore, the voltage drop on series transformer is reduced considerably compared with the conventional generator. Thus the generator can be used for the performance test of the custom power devices with improved performance. The operating principle and the characteristics of the proposed scheme are analyzed and the simulation results show the usefulness of the generator.