The application of Valve-Regulated Lead Acid batteries to wind power generation system

Abstract

Electric power generation systems using renewable energy sources have an advantage of no greenhouse effect gas emission. Using these systems, we have the essential problem of the fluctuation of electric power output, however. In order to solve this problem, one of the solutions is the combination of the renewable energy system with the battery energy storage system. The VRLA batteries manufactured by Shin-Kobe have been used in order to smooth the fluctuations of the wind power generation. On the basis of these findings, Shin-Kobe has newly developed a VRLA battery, the so-called LL-W type, expected more than 17 year life for the use in the system of wind power generation. Before this LL-W type VRLA battery, Shin-Kobe has already applied VRLA batteries as a LL type to the wind power generation system. On the basis ofteardown analyses of the LL type batteries, 7 year life of these batteries has been already proved, as of this time, and the LL type batteries have been still working in the system. The main failure mode of the batteries has been estimated as the corrosion of positive grids. In this practical system of the power generation, on the basis ofteardown analyses, the life of the LL type battery was evaluated to be 9 years, although the life of the newly developed LL-W type VRLA battery has been expected to be more than 17 years.

Review of Battery Types and Application to Wind Power Generation System

“…Therefore, batteries hybridized to the wind power generation have to be operated under very severe conditions. [18]- [23] The LL type battery has been applied to smoothing the fluctuations of the 1.2MW wind power generation system.…”

“…(5) An expected life of more than 17 years of the VRLA battery, the LL-W type (table 1), has been developed for the use in the system of the wind power generation, by taking account of all the information on the LL type VRLA battery already applied to the wind power generation system. [18] Table 1. Outline of developed battery (LL-W type)…”

Stability improvement of 200 MW Gabal El-Zayt wind farm connected to electrical grid using supercapacitor and static synchronous compensator during extreme gust

“…Energy storage system (ESS) is required to keep constant output power as in [7,8]. Batteries and supercapacitor (SC) are types of ESS that have higher speed response than other traditional ESS that has mechanical parts [9,10]. In [11,12] batteries are used with wind energy to improve response and stability.…”

A Combined Approach of Using an SDBR and a STATCOM to Enhance the Stability of a Wind Farm

“…Energy capacitor system (ECS) [12][13], battery energy storage system (BESS) [14][15][16], superconducting magnetic energy storage system (SMES) [17][18][19], and flywheel energy storage system (FESS) [20] are very effective tools as having both active and reactive power control abilities. STATCOM is also found to be a potential candidate to stabilize fixed speed WTGS [21][22][23].…”