Improving the Active Power Quality of a Wind Farm Using Energy Storage Systems

Abstract

Among renewables, wind power has become the source of greater participation at global level. One of the disadvantages of this clean energy are the fluctuations in power flows at the wind generation center outputs, due to the stochastic nature of the wind, which causes negative impacts that affect the reliability of power systems. One way to mitigate these fluctuations is to use flywheel energy storage systems (ESS ). In the operating elements of ESS there are control modules responsible for regulating the active power delivered by wind farms, that is, the active power stabilizers. This study presents three types of stabilizers: the first one is based on the average power delivered by these generation centers and on the ESS power; the second one works through a reference power and the ESS power, and the third one uses a reference power and a proportional-integral (PI) controller to calculate the ESS power. After this energy is obtained, the rotational speed of the ESS is determined. In order to analyze the performance of power stabilizers, the average power and the standard deviation of the power delivered to the power system is calculated