Performance Evaluation of The VSC-Interfaced Distributed Resource Models
Gorken Gumustekin · TSpace (University of Toronto) · 2016
The voltage-sourced converter (VSC) is the mostly used converter conguration for grid integration of distributed resources, i.e., generation and storage units. For such applications, the VSC is conventionally controlled by means of an inner-current controller that operates the VSC based on the desired VSC current to meet the system operational requirements. In compliance with the principles of the inner-current controller, the current-injection model has been widely used to represent the VSC impact studied of the grid-integrated DG. This thesis investigates the validity of the VSC current-injection model under the unbalanced conditions of feeder and low short-circuit ratios. The objective is establish the degree of accuracy of impact studies based on the current-injection model. A test system has been selected and the steady-state and transient-response of a 1.5 MW VSC based detailed switched-model and the current-injection model under various unbalanced and the system short- circuit capacity have been investigated and compared.