The system developed by Siemens Gamesa Renewable Energy is connected to a hybrid controller of a combined wind and PV generation system and supplements the lithium-ion batteries that have been in use for around two years. Renewable energy operators around the wrold have been looking at redox flow batteries to provide more flexibility, but the control electronics is a challenge.
The La Plana test site integrates a 400kW vanadium redox energy storage system with a wind turbine, solar-PV modules and a diesel generator. A flexible hybrid controller has a digital core that coordinates the generation of all energy sources to meet the electrical load, in order to reduce the cost of operation of the plant regardless of whether the grid is connected or disconnected. To reduce energy costs the controller is targeting to achieve the maximum integration of renewable energy.
The large storage capacity, coupled with a 120kW power output allows the intelligent control algorithms to keep generators to their technical minimum load and use more renewable sources, even when low wind periods and cloudy sky occur at the same time.
“With the Redox-Flow technology commissioned at our La Plana test site, we are now active in all relevant storage technologies including Power-to-Heat and also battery storage systems,” said Antonio de la Torre, SGRE’s chief technology officer. “Due to its scalable energy capacity the Vanadium redox battery is a highly promising option to support our advanced technology offers for isolated and grid connected systems”.
Siemens Gamesa is the largest provider of wind power products with a market share of more than 17% and was created in 2017 from Siemens Wind Power and Spanish wind power pioneer Gamesa. It is listed on the Spanish stock market.