China Energy Storage network: In the morning of July 25, the "ninth China energy storage industry tour Research group" jointly organized by China Chemical and Physical Power Industry Association Energy Storage Application Branch, and China Energy Storage Network went into Dongying Kenli Hongtai 40MW PV power station. Qin Dongnian, vice president of Cospowers Group and president of Central Research Institute; Yang Qijun, Xiao Huanxue, director of Electric Energy Storage R&D of Central Research Institute; Guo Siqi, vice sales General Manager of Energy Storage Division of Cospowers Group; Yue Peng, assistant General Manager of Dongying Cospowers and director of General Affairs Department received the research and expert group.

Group photo of the research team

According to the schedule of the day, the expert group first visited Kenli Hongtai 40MW PV power station in Dongying, and then the two sides had an exchange discussion.

Project Context

Dongying Kenli Hongtai 40MW PV power Station is one of the 19 projects in the Letter of Opinions on the Proposed Bidding Photovoltaic Projects in 2020 issued by State Grid Shandong Electric Power Company in June 2020. According to the commitment of the declared project, the energy storage configuration scale is 20% of the installed scale of the project, the energy storage time is 2 hours, and the energy storage project and PV power station are synchronously constructed in stages.

Status of the project

Dongying Kenli Hongtai 40MW photovoltaic power station is located in the territory of Dongying Economic and Technological Development Zone, south of Yonghong Road, east of Dong Ba Road and north of Liushihu Village.

40MW fishing-light complementary power station

The project is invested and built by Dongying Caijin Clean Energy Co., Ltd. The power station is located in Dongying Economic and Technological Development Zone. The designed installed capacity is 40MW, the planned area is 1200 mu, and the construction investment is 170 million Yuan. The full capacity was connected to the grid on December 31, 2020.

The construction area of the power station is the water level of pond and adopts the complementary operation mode of fishing and light. The PV field area is divided into 11 power generation units, consisting of 11 groups of 3.15MW photovoltaic arrays. A total of 44200 single-crystal double-glass high-efficiency 455Wp solar cell modules and 44252 450Wp solar cell modules are installed using PHC prefabricated pipe piles and fixed supports. The main electrical facilities and equipment are equipped with advanced technology, functional matching and efficient operation of inverter booster machine, energy storage, reactive power compensation, ground transformer, PT cabinet, 35kV switchgear, plant transformer and electrical secondary equipment, dispatching automation device, etc. Two loops of 35kV collecting lines and one loop of 35kV sending line are set, which are connected to Linhai 110kV substation to realize grid connection with Dongying city through 9.8km overhead cable.

Dongying Cospowers Technology Co., LTD. (hereinafter referred to as Kunyu Power) energy storage device is adopted for the energy storage power distribution unit of this project.  The total capacity of the supporting energy storage power station is 8MW/16MWh, which consists of 3 2.5MW/5MWh energy storage sub-units, 1 0.5MW/1MWh energy storage sub-unit, and 1 set of energy management system. Each energy storage sub-unit consists of energy storage battery system, energy storage bidirectional converter and booster cabin system.

Site picture of 8MW/16MWh energy storage power station

Switch station layout mainly includes reactive power compensation, grounding transformer, PT cabinet, 35kV switchgear, plant transformer and electrical secondary equipment, etc. The switch station adopts prefabricated cabin layout, 35kV switchgear is arranged in the primary cabin, and secondary equipment is arranged in the secondary cabin.

Line and outlet interval layout: mainly includes 35kV transmission line, 35kV distribution equipment, relay protection device, high automation device, etc. The switch station is equipped with 1 loop of 35kV transmission line, and the terminal point is Linhai 110kV substation. The total length of 35kV line is about 9.8km, including 9.0km overhead line and 0.8km buried cable. 2JL/G1A-240 wire is adopted, and 2 24-core OPGW optical cables are set up in the same tower.

Site picture of 8MW/16MWh energy storage power station

Project value

The project mode is the joint operation of PV + energy storage on the power generation side, which can not only respond to the grid peak and frequency modulation auxiliary business with local resource endowment, alleviate the power shortage during peak period, but also form an advanced demonstration effect with PV + energy storage mode.

Each year, the power station sends 53.5249 million kWh of clean energy electricity, achieving a benefit of 6.3 million Yuan; It can save 15,255 tons of standard coal, reduce the emission of SO 2171.3 tons, CO 242,400 tons, NO 2155 tons and dust 53.5 tons, which has obvious economic and social benefits.

Energy storage construction

Cospowers, as the solution provider and system integrator of this project, is responsible for the design, AC side integration and field debugging of the whole system of the project. At the same time, it provides BMS, main control box, monitoring cabinet, energy management system and other independently researched and developed core equipment. According to the introduction, the project only took 50 days from project approval, design scheme establishment, equipment integration, and equipment arrival, reflecting rapid delivery capability in energy storage system integration project of Cospowers. 

8MW/16MWh energy storage power station site

Significance of the project

After the project is put into operation, the energy storage system device can reduce the amount of light abandoned power for the photovoltaic power station, increase the revenue of the PV power station, realize the adjustable and controllable new energy generation, and thus improve the stability of the power system. At the same time, energy storage system can provide peak regulation, frequency modulation, demand response support and other services for power grid operation, which is an important means to improve the flexibility, economy and security of traditional power system.

Visit the on-site technical exchange of energy storage power stations

Dongying city is the central city, main battlefield and core area of the efficient ecological economic zone of the Yellow River Delta. It has become a trend to develop diversified clean energy that combines PV with fishery, agriculture and wind power development, and the application scenarios of PV+ energy storage system will be more extensive. As a local enterprise, Cospowers has the bold responsibility to accelerate the construction of a clean, low-carbon, safe and efficient energy system for Dongying city, promote the adjustment of the regional energy structure, improve the regional ecological environment, provide intelligent energy storage solutions and high-quality product support, and add impetus to the efficient ecological economic construction of the Yellow River Delta.

Forum site

During the discussion, the relevant leaders of Cospowers Group introduced the company's business development and the layout of energy storage sector in detail.

Cospowers Group registered capital of 574 million yuan, in 2019, with the integration of Coslight International Group (English brand Coslight, listed in Hong Kong in 1999) on the basis of high-quality assets, and excellent team, it has become China's new energy lithium battery enterprise with first-class technology and influence around globe. 

Cospowers team has rich experience in the development and production of electrochemical energy storage products. Since 1999, Cospowers team started the research and development and manufacturing of lithium ion batteries, and is one of the earliest enterprises to develop and produce lithium battery products in China. It has been providing high-quality lithium battery products and services to the world's top customers for 30 years. At present, the company has 4 major product lines: network energy, electric energy storage, green travel, and consumer lithium batteries, and has the one-stop comprehensive solution capability of core product lithium battery cell production, energy management system design and development, and system integration.

Production capacity

Headquartered in Dongying, Shandong Province, the group employs 3,100 people. There are 7 production bases in China, with a total construction area of 310,000 square meters, which are Dongying Cospowers, Changde Cospowers New Energy, Harbin Coslight New Energy, Shenzhen Coslight, Shenzhen Lexel, Chuzhou Cospowers and Dali Cospowers.

It has 11 branches abroad with more than 500 foreign employees. Among them, three overseas branches, including Korea Coslight International Co., LTD., Moscow Coslight Co., LTD., India Cospowers Private Co., LTD. (120,000 square meters production base), have the ability to integrate lithium battery system and provide local product supply and after-sales service. For 10 consecutive years, it has been ranked first in the global shipments of communication lithium battery products in the subdivided field.

Energy storage Product series

Core electrochemical energy storage lithium battery cell products: prismatic aluminum case lithium iron cell, cylindrical ni-mh cell.

Network energy storage battery products: backup power for communications energy storage and backup power for data centers (UPS).

Electric energy storage battery products: grid side, generation side, user side, industrial and commercial and other electrochemical energy storage overall solution.

Household energy storage products: portable outdoor power supply, home energy storage products.

Consumer battery products: NI-MH charge and discharge battery and charger series, household energy storage, portable energy storage.

Market development and application

Foreign communications and power storage markets: With rich experience in R&D, manufacturing and service, Cospowers Group has become a global leader in the field of energy storage in China, and has the ability to deeply develop the international market. The group has taken the lead in building a marketing service network covering nearly 60 countries and regions in the Asia-Pacific, the Middle East, Africa, Europe, North America, and South America and so on. Overseas big customers are concentrated in India Reliance, Vietnam Telecom, Korea Telecom, Russia Telekom Power, Indonesia Telekom Power, Vodafone and many other international famous brands, with accumulated over 6 billion Yuan of shipment of electrochemical energy storage products.

Domestic communications and power storage market:

Communication field: For more than 30 years, we have been providing electrochemical backup and emergency backup products for China Mobile, China Tower, China Telecom and China Unicom.

In the field of electric energy storage: provide the electrochemical energy storage overall solutions of lead-acid battery, DC power supply, lithium battery for backup power supply, UPS lithium battery for emergency use, electrochemical energy storage on the generation side, grid side and user side for State Grid, China Southern Power Grid, five and four small power generation groups, power communication, power plant and other state-owned and central enterprises.

Product support: with Huawei, ZTE, Fiberhome, Emerson, Kehua and other domestic well-known brand equipment manufacturers to maintain supporting cooperation for many years.

Forum site

During the exchange, the experts of the research group had extensive exchanges with the leaders of Cospowers Group in terms of battery ontology safety, technology, cost, application, system integration capability, grid connection and scheduling of stations, as well as research and evaluation of electrochemical energy storage market prospects.