Modeling and Simulation of Three Phase-Four Wire Compensated System Using the H-Bridge VSI Topology-Based DSTATCOM

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Executive Summary

The Transient response of the Distribution STAtic COMpensator (DSTATCOM) is very important while compensating rapidly varying unbalanced and nonlinear loads. Any change in the load affects the dc link voltage directly. The sudden removal of load would result in an increase in the dc link voltage above the reference value where as a sudden increase in the load would reduce the dc link voltage below its reference value. The proper operation of DSTATCOM requires variation of the DC link voltage within the prescribed limits. Conventionally, a Proportional-Integral (PI) controller is used to maintain the dc-link voltage to the reference value. It uses the deviation of the capacitor voltage from its reference value as its input.

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