Abstract
The installation of wind power generation is progressing globally to prevent exhaustion of resources and global warming. If the output fluctuation of the wind turbine is suppressed using the storage battery, total installation cost may become expensive. In this study, authors propose to utilize the inertial energy of windmill to suppress the output power fluctuations. The proposed control reduces the rotating speed of a variable speed wind turbine to inject excessive power to the grid by a vector control of utility interactive converter. Therefore, the output power of the wind power generation can be boosted by the inertial energy of the windmill. When two wind power generators are connected in parallel, interchange of the inertial energy between the windmills can be considered and, therefore, the total output power of the two wind power generators can be smoothed during a short period. In this paper, it is confirmed that the fluctuation can be suppressed by the proposed method as compared with the case where the wind power generators are equipped with no more than the traditional MPPT control.
