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A novel PV power inverter applied in micro-grid is developed in this paper. It runs not only in connected-grid but also in disconnected-grid and keeps voltage stable rapidly in transient process. When the inverter is connected with the grid, the inverter produces power as a current-source with voltage-current close loop control strategy. Once the islanding event takes place, it runs as a voltage-source,...
In the paper an active islanding detection algorithm is proposed based on grid-connected distributed generation system. If the modulation sinusoidal waveform of the DSP controller presents has been a slight asymmetry, the output current of the inverter would reveal the same amount of asymmetry, then the output power will be keep an orderly change between two consecutive half-cycle. When in grid-connected...
With the development of renewable energy, distributed generations such as photovoltaic generation, wind power systems need to be connected to a utility power grid for the systems to work effectively as energy sources. Islanding detection is one of the most important techniques to develop for the distributed generation systems. A novel active islanding detection algorithm based in pseudo-random signal...
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