WANG Chun, YUAN En-lai, FENG Bin-chun, ZHANG Zi-min (China Institute of Water Resource and Hydropower Research, Beijing IWHR Technology Co., Ltd, Beijing 100038, China)

Abstract: With the analysis of the differences between stand-alone wind power system and the convention al system, this paper introduces a new balance method by controlling the variable power load, and using a small amount of batteries. The paper introduces the structure and control method of stand-alone wind power system which is based on DC bus, and the characteristics under variable load operation as well. When the wind speed is high, the load works under rated power operation. On the contrary, the load works under variable power operation. Batteries charge or discharge according to the differences between total wind power input and load power, which ensures that the system is stable. Field testing results show that the stand-alone wind power system based on DC bus is stable, and the load works well.

Key words: stand-alone wind power, battery, DC bus, variable power operation

Published in: Journal of China Institute of Water Resources and Hydropower Research (Vol. 10 No. 3, 2012)