Distributed energy storage system in wind power generation

With the rapid development of wind power generation during these years, many large wind farms were established, and the adverse impact of wind power fluctuations on power grid has become significant. In this paper, we put forward an improvement scheme of distributed energy storage system to cope with this effect, and to maximize the utilization ratio of wind power. Energy storage systems can smooth the fluctuations of wind power, and they perform better in larger wind farms. Unlike traditional methods, the energy storage systems are located besides load centers rather than wind farms, causing no more investment. In our plan, charging stations for electric vehicles are built within some of the energy storage stations and these electric vehicles can also be regarded as energy storage devices. Different kinds of devices are applied to improve the response speed and capacity of energy storage system. Furthermore, these distributed energy storage systems have a better performance if combined with other kinds of renewable energy generation. Our research is based on digital simulation and dynamic experiment, and the results show that this distributed energy storage plan is more effective than traditional methods.

I. Introduction

As a rapidly developing renewable energy in the world nowadays, wind energy has some drawbacks such as indeterminate, intermittent and nonschedulable. These disadvantages make it impossible for wind energy to integrate into power grids steadily [1], [2]. In recent years, China's wind power installed capacity has been increasing in an annual growth rate of nearly 100%. Due to the unstable power supply, the proportion of wind power in power grid will be limited, making a major obstacle in wind power development. Besides, large-scale wind farms usually locate in remote areas or at sea, far from load centers. Thus it is particularly important for wind farms to provide energy to load centers efficiently and steadily.