Output voltage characteristics analysis of a power quality disturbance generator suitable for high power applications

This paper deals with output voltage variation of a power quality disturbance generator. The generator is used for the test of high power custom power devices such as DVR, SSTS, SVC, STATCOM, dynamic UPS, etc. The major components of the generator are transformers and SCR thyristors, which guarantees high reliability, high efficiency, and cost-effective implementation. However, it is inevitable to have some voltage drop at the output terminal because of the impedance of the series transformers. The voltage drop depends on the magnitude of output current and load power factor. Therefore, it is necessary to analyze the generator output voltage characteristics according to the load power condition. Simulations and experiments are carried out with scaled down system of 10 [KVA] generator, and it is found that the voltage drop is 3.7 [%] at 0.8 lagging power factor. It is expected that the analysis result is helpful for the design of transformer based power quality disturbance generator.