Dynamic behavior analysis of a voltage source inverter for microgrid applications

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Abstract
The dynamic behaviour of a PWM voltage source inverter based voltage generator with an output LC filter is analyzed in this paper. This converter is able to participate to frequency regulation either in connected mode or in an islanded mode with minor modifications in the control algorithm. Thanks to a droop control, it is possible to achieve power sharing between this converter and a classical synchronous machine with a good dynamic behavior. In islanded mode, the converter generates a good voltage source. A strategy of islanding detection depending on the rate of Change of Frequency (ROCOF) was also developed. An original experimentation using Power Hardware in the Loop and real-time simulation was realized to verify the theoretical analysis.

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