Distributed power source island detecting method based on grid-tied point characteristic harmonic wave voltage measurement
A distributed power supply and harmonic voltage technology, applied in the field of distributed power island detection based on the characteristic harmonic voltage measurement of grid-connected points, can solve problems such as grid misjudgment, affecting grid power quality, and large detection blind spots
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[0056] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0057] In the distributed power grid-connected system, the distributed power is connected to the inverter, and the inverter is connected to the grid through the inlet filter and the transformer in turn. When the distributed power supply is connected to the grid through the inverter, since the load impedance is much larger than the system impedance, it is equivalent to an open circuit when no islanding occurs. The inverter generates specific harmonic...
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