In today’s world, green, low-carbon, and intelligent development has become a global priority. As countries navigate diverse development stages and resource conditions, balancing energy security with sustainable transition remains a critical challenge. For major energy consumers and the global energy market alike, overcoming the “energy trilemma” — affordability, sustainability, and reliability — is key.
FGI (Shandong-based state-owned enterprise) continues to lead by innovation. Leveraging its technical strengths, FGI has successfully applied high-voltage cascade technology in the field of electrochemical energy storage, setting a new benchmark for the industry.
Project Overview
Located in Lingtai County, Gansu Province, this project supports a 100MW agro-photovoltaic hybrid power station with an advanced energy storage system. The PV plant includes a new 110kV booster station, equipped with two 105MVA main transformers, connected to a 330kV substation via a 110kV overhead line.
The supporting energy storage system has a rated capacity of 5MW/10MWh. Energy from the battery system is converted through PCS and stepped up from 10kV to 35kV, then integrated into the 110kV substation via a 35kV collection line. The solution adopts a 10kV high-voltage cascade system combined with a 35kV/10kV booster transformer.
The storage system includes battery clusters, PCS units, EMS, and fully equipped containers (with HVAC, ventilation, distribution, fire protection, security, lighting, and fire-retardant materials), as well as internal cabling and communication lines.
Key Features
- 35kV step-down design: Voltage is stepped down to 10kV before connecting to the high-voltage cascade energy storage system.
- Balance of safety and cost: Optimized configuration ensures system safety and cost-effectiveness.
- Modular single-phase design: Enhances safety spacing and capacity allocation.
- Large capacity per unit: Simplifies grid dispatch and enables fast response.
- No circulating current: Battery clusters operate in series with efficient energy flow.
Social & Environmental Benefits
The 5MW/10MWh energy storage system enhances the stability of PV output, enabling large-scale renewable integration. It actively supports grid regulation by storing energy during the day and discharging at night, easing nighttime power supply pressure.
By participating in the electricity market, the storage system also improves the economic returns of the PV station. Over its 25-year operation period, the project is expected to generate 186 million kWh annually, reduce CO₂ emissions by approximately 170,000 tons, and save 57,000 tons of standard coal each year — contributing significantly to regional environmental improvement while delivering economic value.
Production Base: Jincheng Road, Economic Development Zone, Wenshang County, Jining City, Shandong Province, China
Email: overseas@fengguang.com
Website: www.fengguang.com
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