Comparative Analysis of VSC-Based Series Compensator (DVR) and Shunt Compensator (DSTATCOM) Used for Voltage Improvement in Distribution Network

Abstract

In this paper, the performance of voltage-source converter-based shunt and series compensators used for load voltage control
in electrical power distribution network has been analyzed and compared, when a nonlinear load is connected across the load
bus. At present, a wide range of very flexible controllers, which capitalize on newly available power electronics components,
are emerging for custom power applications. Among these, the distribution static compensator (DSTATCOM) and Dynamic
Voltage Restorer (DVR) are most effective devices, both of them based on the VSC principle. A DVR injects a voltage in series
with the system voltage and DSTATCOM injects a current into the system to correct the voltage sag, swell, and interruption.
Comprehensive results are presented to assess the performances of each device as a potential custom power solution. The effect
of various network parameters on the control performance of the compensator can be studied using the proposed analysis. In
particular, the performance of the two compensators is compared with the ac supply distribution network. The MATLAB
simulation verification of the results derived has been obtained using a model of the three-phase DSTATCOM and DVR.