Dynamic Model and Control of Power Converters for Grid Connected Renewable Energy Systems

A.F. Nnachi, D.V. Nicolae, and A.A. Jimoh (South Africa)


Converter, dynamic model, controller, Renewable energy.


In order to investigate certain dynamic events of a grid connected renewable energy system (RES), a systematic model and control is developed. The RES with its converter is taken as a controlled dc current source and the grid side converter model is based on approximate power balance of the dc-link and the ac-side. Here an AC side decoupled current controller in dq reference frame and simplified net dc-bus voltage controllers are implied. Among different dynamic events that is studied, the response of the system during three-phase to ground fault, step change in reference DC voltage, active and reactive power change are studied and presented.

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