Performance evaluation of DSTATCOM with 9-level GTO converter

The paper investigates the dynamic operation of novel control scheme for Distributed Static Synchronous Compensator (DSTATCOM) with 9-level inverter. The performance of proposed controller is simulated by the MATLAB/Simulink. The DSTATCOM scheme and the electric grid network are modeled by specific electric blocks from the power system block set, while the control system is modeled using Simulink. In this paper 9 level converter is used instead of 48 pulse converter for DSTATCOM operation in distributed system. In general 48 pulse converter requires 8 transformers and 8 six pulse converters. Hence, it is expensive and complex in operation. In order to overcome these problems, proposed 9 level multilevel inverter based DSTATCOM and it is tested under balanced and unbalanced load condition. Moreover, results also presented for reactive power and non-linear load compensation. In our proposed structure have only one transformer and single 9 level converter, therefore, operation in controlling is very easy and cost effective compare to general configuration.