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A transformer based voltage sag generator to test renewable energy systems is presented. Design considerations concerning overvoltages and overcurrents during switching action are addressed. Measurement results of a 30 kW laboratory prototype testing a line side PWM converter and a DFIG are presented. Both measurement results for investigations on the transformer based sag generator at the line side...
The objective of this project was to assess the specific transformer grounding and connection methods that are used at the subject utility for distributed generators (DGs) and provide a risk assessment in terms of potential impact, ways to minimize the impact, and site specific screening criteria for additional protection that may be required for DG interconnection. The utility has standardized on...
Self excited induction generator is extensively used in renewable energy sources such as small & large wind farms, small hydroelectric power plant and recently in micro combined heat and power systems muCHP. When connecting this unit to the grid a high transient current will flow. There will be a large, very fast, magnetic inrush current similar to that which occurs when a transformer is energised...
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