A static VAR compensator with supply side current sensors and improved transient response using feed-forward control

The static VAR power compensators (SVCs) based only on the supply current sensing and indirect reactive power estimation, require lesser number of current sensors and use simpler control technique. However, the transient response of these compensators is poor as compared to SVCs, based on load current and supply current sensing. This paper presents two simpler feedforward techniques for improving the transient response of a SVC based on supply current sensing. The SVC has been simulated for both the techniques to study and compare their transient and steady-state performance. The compensator is simulated for various values of feed-forward gain. The results are presented to demonstrate the transient performance and stability of the converter. Experimental results support the simulation results.