Dynamic and unbalance voltage compensation using STATCOM

This paper investigates reactive power compensation strategies to mitigate voltage quality problem in power system such as flicker, sag, swell and unbalance. We choose to utilize STATCOM (Synchronous static compensator), which encompasses advantages including, but not limit to, rapid response time and the ability to provide reactive power at low voltage, and to provide voltage compensation. Based on the operation principles of STATCOM, we designed a dynamic balanced voltage compensator. For unbalanced voltage compensation, two unbalanced controllers using the phase voltage amplitude and negative sequence component are proposed. Simulations under PSCAD/EMTDC are carried out using the designed compensators to show the effectiveness of the proposed controller designs.