400MW+235MW! CGN's two major photovoltaic projects are connected to the grid

On May 27, the 400MW offshore photovoltaic project of CGN Yantai Zhaoyuan was connected to the grid for power generation at full capacity. On the same day, the largest single-unit "tea-light complementary" Power Station in China, the235MW photovoltaic power station of CGN Yunnan Mojiang Lianzhu, was connected to the grid for power generation on May 27.

The 400MW offshore photovoltaic project of CGN Yantai Zhaoyuan is located in the Laizhou Bay waters of Zhaoyuan City, Shandong Province. The photovoltaic field is 2 kilometers away from the coast at the closest distance and 6.2 kilometers away at the farthest distance. The total sea area is 512.7 hectares. It is connected to the 220 kV onshore booster station through 16 35 kV collector lines.

"The project started construction on December 26, 2023. The water depth of the site is 8.5 to 11 meters. It is the deepest project among the first ten offshore photovoltaic project sites in Shandong Province." Zhang Zhiwu, Party Secretary and Chairman of China General Nuclear Power New Energy Holding Co., Ltd., said that the project has incorporated the green concept of the entire life cycle from the beginning of its design. It is expected to generate an average annual power generation of 694 million kWh, which is equivalent to reducing standard coal consumption by about 208,700 tons and reducing carbon dioxide emissions by about 535,800 tons, equivalent to afforestation of 1,562 hectares, with significant ecological and economic benefits.

According to reports, the project successfully applied a series of innovative products such as the independently developed double-sided double-glass offshore Photovoltaic Modules, and formed a complete set of construction process systems for offshore photovoltaic projects that can be replicated and promoted, which is of great significance to the large-scale development of offshore photovoltaics in my country.

Three innovative applications show their talents and forge the "Chinese solution" for offshore photovoltaics

The project team has created three innovative applications in the research and development and application of photovoltaic modules, the technical design of bracket units, and offshore piling, and achieved remarkable results.
The marine environment has the characteristics of high salt fog, high humidity, high wind load, and high ocean current impact, which puts high demands on the material corrosion resistance, structural characteristics, and system stability of the components. In view of the environmental characteristics of the project, CGN, with the concept of open collaboration, jointly developed the first batch of single-crystal silicon heterojunction N-type bifacial dual glass solar panels in China that are adapted to the marine environment, with a photoelectric conversion efficiency of 22.86% and a component bifacial rate of more than 85%.

Through the development and application of this component, CGN has obtained 7 patents including "Nano fully passivated contact crystalline silicon heterojunction double-sided solar cell and its manufacturing method" and "A surface salt scale cleaning mechanism for sea photovoltaic power generation equipment", which has effectively promoted the technological progress of offshore photovoltaic components.

The 400MW offshore photovoltaic project of CGN Yantai Zhaoyuan consists of 121 power generation units, each of which consists of 6 to 8 sets of photovoltaic bracket units. The project team adopted the industry's first "large-span bolt ball steel grid + spiral variable diameter steel pipe pile" technical solution to create a photovoltaic support "super bracket". A single set of photovoltaic bracket units can carry an installed capacity of 590 kilowatts, is 69.3 meters long and 37.3 meters wide, equivalent to the size of 6 standard basketball courts, and bears a load of about 120 tons. Its installed capacity and bracket size are both the largest in the domestic photovoltaic industry.

In addition, through the design safety review of numerical wind tunnel simulation and pressure wind tunnel test, the stability and safety of the bracket unit are guaranteed from the design. The bolt ball node of the bracket is covered with cold-wrapped mineral fat tape, which effectively improves the node's sealing performance and corrosion resistance.
At the project site, the blue photovoltaic modules covering nearly 500 hectares of sea area stretch to the junction of the sea and the sky. Under this "blue ocean", more than 4,400 pipe piles play a key supporting role. The project has developed pile foundation construction techniques such as "multi-pile high-precision synchronous positioning", and developed and built a new type of piling ship "Dianjian Haizhuang No. 001", which is the first (set) of offshore photovoltaic intelligent and efficient piling equipment in the country.

In actual application, the "Beidou + GPS" dual precise positioning method is used to achieve the accuracy of pile foundation position control at the centimeter level. The configured wave compensation system can reduce the hull shaking amplitude and ensure the relatively stable position of the pile hammer suspended on the ship. The two cranes equipped on the left and right sides of the hull can carry out suspended piling synchronously, and the operating radius can cover 40 meters. Compared with traditional offshore piling ships, the efficiency of pile sinking has increased by 5 times, and the construction cost has been reduced by more than 50%. In addition, based on good stability, the ship also undertakes construction operations such as box transformer installation, cable laying, and bridge installation in offshore photovoltaic areas, realizing "one ship for multiple uses".

The largest single-unit "tea-photovoltaic complementary" power station in China is connected to the grid
On May 27, the largest single-unit "tea-photovoltaic complementary" power station in China, the 235MW photovoltaic power station of CGN Yunnan Mojiang Lianzhu, was connected to the grid for power generation.
The power station built a photovoltaic power station on the 5,250-acre tea mountain leased by the investor and builder, realizing the three-dimensional value-added utilization of land and injecting new momentum into rural revitalization.
At the project site, the blue photovoltaic modules covering nearly 500 hectares of sea area stretched to the junction of the sea and the sky. Under this "blue ocean", more than 4,400 pipe piles played a key supporting role. The project has studied and formed pile foundation construction processes such as "multi-pile high-precision synchronous positioning", and developed and built a new type of piling ship "Electric Construction Haizhuang No. 001", which is the first (set) of offshore photovoltaic intelligent and efficient piling equipment in the country.
In actual application, the "Beidou + GPS" dual precise positioning method can achieve the control of pile foundation position accuracy at the centimeter level. The configured wave compensation system can reduce the hull shaking amplitude and ensure the relative stability of the pile hammer suspended on the ship. The two cranes equipped on the left and right sides of the hull can carry out suspended piling at the same time, and the operating radius can cover 40 meters. Compared with traditional offshore piling ships, the efficiency of piling has increased by 5 times, and the construction cost has been reduced by more than 50%. In addition, based on its good stability, the ship also undertakes construction operations such as box transformer installation, cable laying, and bridge installation in offshore photovoltaic areas, realizing "one ship for multiple uses".
The largest single-unit "tea-light complementary" power station in China is connected to the grid
On May 27, the largest single-unit "tea-light complementary" power station in China-CGN Yunnan Mojiang Lianzhu 235MW photovoltaic power station was connected to the grid for power generation.
The power station built a photovoltaic power station on the 5,250-acre tea mountain leased by the investor and builder, realizing the three-dimensional value-added utilization of land and injecting new momentum into rural revitalization.