New reactive islanding detected method for micro-grid

摘要

Islanding detection is an important technique for micro-grid connected/isolated control. Traditional passive island detection reliability is bad, while active method have negative influence on power quality, so a new method based on chaotic property was proposed. The main reasons of chaos phenomenon during micro-grid conversion process in both connected/isolated operation modes are studied in this paper. Chaos theory is applied to reconstruct the phase space of voltage waveform in the micro-grid conversion process. At the same time, the maximum Lyapunov exponents of the voltage waveform are extracted. The results prove that typical chaos phenomenon occurs during the conversion process. And finally, the simulations of micro-grid isolated detection are carried out in the platform of RTLAB, proved the islanding detection is effective based on the chaotic characteristics. Through introducing the chaos characteristics of connected/isolated micro-grid, blind areas of the island detection can be decreased, improve the accuracy and reliability of the island detection.