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Control of parallel inverter-interfaced distributed generation systems in microgrid for islanded operation

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3 Author(s)
K. T. Tan ; School of Electrical and Electronic Engineering, Nanyang Technological University, 50, Singapore 639798 ; P. L. So ; Y. C. Chu

This paper focuses on describing and evaluating a controller that is used for the operation of a microgrid when it becomes isolated. A microgrid is connected to the medium voltage network when operating under normal conditions. However, both scheduled and forced isolation can happen during the operation of the microgrid, and under these conditions, the microgrid must still be able to continue to operate stably and autonomously. The controller proposed for each distribution generation (DG) system has inner voltage and current loops for regulating the three-phase grid-interfacing inverter and an external power control loop for facilitating power sharing between the paralleled DG systems when a utility fault occurs and the microgrid becomes islanded. Simulation of the proposed controller is performed using Matlab/Simulink and the results suggest that this control method is a feasible solution to control the microgrid during both grid-connected and islanded modes.

Published in:

Probabilistic Methods Applied to Power Systems (PMAPS), 2010 IEEE 11th International Conference on

Date of Conference:

14-17 June 2010