A new method of on-line grid impedance estimation for PV inverter
作者： L. Asiminoaei , R. Teodorescu , F. Blaabjerg , U. Borup
DOI: 10.1109/APEC.2004.1296067
关键词: Power electronics 、 Grid 、 Maximum power point tracking 、 Grid-connected photovoltaic power system 、 Photovoltaic system 、 Electrical impedance 、 Electrical engineering 、 Electronic engineering 、 Total harmonic distortion 、 Engineering 、 Inverter
摘要: The recent increase in photovoltaic (PV) installations calls for new and better power quality requirements with respect to connection the grid supply. Therefore, different methods are typically used continuous monitoring, usually by using external devices. In this paper a method on-line measuring impedance is presented. presented requires no extra hardware being accommodated typical PV inverters, sensors CPU, provide fast low cost approach of measurement. By injecting noncharacteristic harmonic current voltage response it possible evaluate impedance. Practical test on an existing inverter validate method.
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