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Simulation analysis of the islanding tests with the rectifier circuit load is performed. The rectifier circuit load has the impacts to the harmonic voltage after the islanding operation, and reduces the frequency and fundamental voltage greater than if no rectifier circuit loads. It is probable that total harmonic voltage distortion occurs more than 2V in a balanced three-phase circuit, if the ratio...
We propose a novel active islanding prevention method for large penetration of photovoltaic (PV) systems by detecting the harmonic impedance change, and have developed the simulation models for PV inverters which have new active methods by using PSCAD/EMTDC. We also study the performance of islanding detection functions in non detection zone (NDZ) by simulation analysis and clarify the effectiveness...
When large penetration of the distributed generators (DGs) such as photovoltaic (PV) systems is growing up in grid system, it is important to quickly prevent islanding caused by power system fault in order to ensure electrical safety. We propose a novel active method for islanding prevention by harmonic injection synchronized with exciting current harmonics of the pole transformer in order to avoid...
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