Centralised (Shared)

Battery Storage Station for

Renewable Power Plants

Renewable energy sources like solar and wind are often

unstable and unpredictable, which undermines their efficiency

and impact. A centralised (shared) energy storage station offers

an innovative solution by combining the strengths of different

renewable sources, making clean energy station more

economically viable and reliable. The case study presents you

an example of the solution.

Industry Brief Background Business Challenges Solution Results

Project Name: Xiantao (Hubei) 50MW/100MWh Centralised

(Shared) Energy Storage Station for Solar Power Plants

Location: Hubei, China

Executive Summary

Key Metrics:

l Total installed capacity: 50MW/100MWh

l The energy storage power station covers an area of

8400m2

l The project generates approximately 240 million kWh of

electricity annually

l The first power station in Xiantao to successfully achieve

grid-connected power backfeeding.

Governments and companies worldwide are scaling up investments in

solar, wind, hydro, and other renewable energy sources, with solar

and wind accounting for the majority of this growth. According to the

IEA, renewables are expected to contribute over 90% of global

electricity capacity growth through 2030. The adoption of renewable

energy not only supports environmental and public health but also

enhances the resilience of power grids against various disruptions, with renewables serving as a backup energy source. To reduce greenhouse gas emissions, governments are implementing

policies to phase out policies for limiting the use of fossil fuels. China

has pledged to achieve carbon neutrality by 2060 and to peak carbon

emissions before 2030. The EU’s Renewable Energy Directive

mandates that 42.5% of its energy must come from renewable

sources by 2030. Thailand aims for carbon neutrality by 2050 and

net-zero greenhouse gas emissions by 2065. As the demand for

cleaner energy intensifies, new energy usage models such as electric

vehicles, are emerging.

Global Efforts in Achieving Carbon

Neutrality

Industry Brief

Shared energy storage integrated with wind and solar power offers an

innovative solution to key challenges facing renewable energy: the

inconsistency of power generation and the fragmentation of renewable

power plants. This approach involves a shared energy storage systems

connected to various renewable power plants across different locations via

distinct network control systems. Shared storage systems for wind and

solar power plants within a town can maximize energy storage utilization

and balance the intermittent nature of renewable energy generation.

For example, wind power can compensate for solar energy shortages

at night. Furthermore, the centralized battery management system

and power control system can reduce operation and maintenance

costs by eliminating the need for monitoring and maintenance at each

station. This setup facilitates the development of renewable energy

plants, making such investments more economically viable. Shared Storage: Smarter Integration for Renewable Energy

Industry Brief

Local Energy Overview

Background

Tertiary Industry

15.8%

Secondary Industry

57.8%

Households

22.8%

Primary Industry

3.6%

Energy Consumption Pattern of

Xiantao City, 2021

Local Energy Consumption Pattern in 2021:

Energy Consumption: 4.023 billion kWh (2021)

Population: 1.0932 million (2023)

Location: Xiantao City, Hubei Province, China

l To build a secure and diversified energy supply

system, the province aimed to add 20 million

kilowatts of new renewable energy installed

capacity.l The local policy mandates energy storage

allocation for new renewable energy projects

(wind farms and solar power plants), requiring a

storage capacity ratio of 20-30% of the installed

renewable capacity.

Xiantao’s Energy Goals

Due to the inherent intermittency and volatility of solar power, photovoltaic (PV) energy cannot yet operate independently without

the power grid. Independent solar power plants face challenges such

as inconsistent power supply and energy waste during periods of

peak generation. Furthermore, installing an energy storage system

for an individual renewable power plant involves high investment

costs and a long payback period. Solar power can only effectively

replace conventional energy sources when supported by sufficiently

advanced energy storage systems or supplemented by other energy

sources.

In a PV plant, when power generation is constrained, increased

reliance will be placed on the emergency support and grid-stabilizing

functions of energy storage systems. The operational processes of

energy storage stations may be further disrupted, potentially

compromising grid stability and system-wide efficiency optimization. Therefore, real-time monitoring and intelligent management of

energy storage systems are essential to ensure reliable operation.

BuacsikngersosuCndhallenges

The Xiantao 50MW/100MWh Centralized (Shared) Energy Storage

Power Station is serving as a complementary facility to a 325MW

fishery-solar hybrid photovoltaic project within a same area. The

station comprises 20 energy storage units capable of delivering

continuous discharge for at least 2 hours at rated power. It connects

to the 35KV side of the step-up substation of a PV power plant

through dual 35KV transmission lines, with an interconnection

distance of approximately 0.1km. The centralized energy storage system provider partners with wind

farms and solar power plants through a leasing model. Renewable

energy generated by wind and solar facilities is aggregated and stored

in the shared energy storage system before being fed into the grid as

a unified output. Each wind farm is connected via a dedicated ring

network with localized encryption to ensure secure data transmission.

In this project, 3onedata has deployed a cutting-edge digital

monitoring system, establishing a comprehensive data management

platform. This digital solution enables refined operational control, enhances system efficiency, ensures full process transparency, and

delivers intelligent management capabilities.

Solution: Centralized

Storage Empowering

Renewable Synergy

Solution

Networking Solution

Connectivity Brings Stability and Operational Excellence

Based on the specific requirements of the project, 3onedata has adopted the patented SW-Ring redundancy technology. In this solution, five

transformers are configured in a dual information ring network + single control ring network architecture.

In the single control ring network, battery status information, such as from the BMS and PCS, is transmitted to the core control network via a ring

formed by IES7110-2GS switches. In the event of a thermal management incident within the battery system, control commands can be sent in real

time via the dedicated control network. In the dual information ring network, devices at the front end, such as the battery modules, PCS, and

electric meters—are linked using IES318 switches. The data is encrypted centrally and then transmitted via two independent ring networks formed

by IES716-2GS to the IES5428, which then forwards it to the server. Meanwhile, the control network independently forms a ring using IES7110-2GS

switches to upload data to the IES5428 as well.

ICS6528

Solution

IES318 IES7110-2GS IES716-2GS IES5428

The dual-data ring and single-control ring network architecture enhances real-time performance, reliability, and security for both data transmission and control operations. Moreover, the network transmission system supports 100 Mbps access, Gigabit ring network communication, and 10 Gbps uplink aggregation, ensuring zero-delay information transfer. In compliance with industrial requirements, the connection devices are designed with EMC Level 4 protection, enabling them to withstand strong electromagnetic interference in field environments. Additionally, they comply with IEC 62443 industrial cybersecurity standards, offering multi-layered protection features such as user authentication, IP whitelisting, and secure HTTPS/TLS v1.2 configuration to prevent unauthorized access and cyberattacks. Leveraging Industry-Leading Technologies in Information Connectivity Solution

The centralized energy storage system enhances the energy

efficiency of renewable power plants and improves the overall

operational efficiency of the power grid. Equipped with non-walk-in

battery prefabricated cabins, the system includes independent

automatic control and safety assurance features such as power

supply, temperature control, thermal insulation, emergency response, and alarm systems. It provides a high level of protection against

potential incidents. The central station increases the energy density

of each storage unit and significantly reduces both installation and

maintenance costs by minimizing the need for upkeep across

multiple separate storage stations. Since its establishment, the project has provided approximately

262,555 MWh of green electricity annually, saving 80,200 tons of

standard coal equivalent. It has also reduced smoke and dust

emissions by around 1,232.8 tons and carbon dioxide emissions by

approximately 211,900 tons. As electricity generation increases, the

level of electrification in society has risen to 25% of total energy

consumption. Furthermore, this centralized energy storage system

contributes to the stability of the power grid on the supply side, helping reduce the average annual power outage time to within 1.5

hours for urban users and 7.5 hours for rural users by 2025.

Results

3onedata has facilitated the

project's one-step intelligent

operation and maintenance by

ensuring the stable operation

of the support system.