Intelligent “upgrade” solution for large-scale grid connection of new energy

With the successful completion of the docking and merging of the last fan impeller and generator, the second phase expansion project of the National Scenery Storage and Loss Demonstration Project (hereinafter referred to as the “Phase 2 Expansion Project”) was completed and started to be transferred to the operation and commissioning phase. The second phase of the expansion project photovoltaic and wind farm construction tasks have been completed. Since the national landscape storage and transportation demonstration project was put into operation in 2011, it has solved many difficult problems of large-scale centralized grid connection of new energy, and the demonstration effect is remarkable. The newly completed second-phase expansion project will become an “upgraded version” of the national scenery storage and demonstration project.

The State Grid Corporation of China made a strategic decision to start the construction of the second phase expansion project of the National Scenery Storage and Loss Demonstration Project, and comprehensively build an “upgraded version” of the National Landscape Storage and Demonstration Project.

The first phase of the National Landscape Storage and Demonstration Project (hereinafter referred to as the “Phase I Project”) will build a wind power of 98,500 kilowatts, photovoltaic power generation of 40,000 kilowatts, and energy storage equipment of 20,000 kilowatts. On this basis, the second phase of the expansion project will continue to expand. Expand capacity expansion, build 400,000 kilowatts of wind power, 60,000 kilowatts of photovoltaic power generation, and 50,000 kilowatts of energy storage devices.

“Building scale expansion” and “soft power improvement” are the two goals of the second phase expansion project. In the case of ensuring the technological advancement and application demonstration of wind turbines, photovoltaics, energy storage and other related equipment, the second phase expansion project should form a scale effect by increasing the installed capacity and energy storage configuration of the grid, build a scientific research platform, and establish a research and development center. Produce scientific and technological achievements and achieve the improvement of soft power.

In accordance with the relevant deployment requirements of the State Grid Corporation, under the development framework of scale, effectiveness and integration, the second phase expansion project will further explore the characteristics of complementary advantages of landscape resources and centralized bundling operations, and optimize the operation control of energy storage batteries. Expand the demonstration effect of grid-friendly new energy power stations, strengthen the research on grid-connected characteristics of large-scale wind-solar hybrid power generation systems, deepen the leading role of science and technology, actively explore the joint operation mode of wind storage and pumping and storage, and effectively demonstrate the national scenery storage and storage demonstration The project is playing a leading role in improving the grid's acceptance of large-scale new energy sources.

After the second phase expansion project is put into operation, it will provide about 1.25 billion degrees of high-quality, reliable and stable green electric energy every year. The annual output value will reach 700 million yuan, saving 420,000 tons of standard coal and reducing carbon dioxide emissions by 900,000 tons.

During the construction process, the project builders have been able to support various difficulties and promote the construction of the project. In the dam area where the project is located, spring comes late, winter comes early, the effective construction period is short, the construction environment is bitter and the climate is changeable. As the owner of the project, the State Grid Xinyuan Zhangjiakou Fengguang Storage Demonstration Power Station Co., Ltd. always adheres to the highest standards, the most stringent requirements, the best construction, the cohesion of all parties, the implementation of lean work, and the management To run the demonstration power station well, it is necessary to comprehensively promote the "two battlefields" of the second-phase expansion project in an orderly manner to gather the strengths and deepen the attack.

Especially since December, there have been frequent winds and cold weather in the Bashang area. The daily minimum temperature is around minus 15 degrees Celsius, and the wind power in the afternoon is more than 5 degrees. The on-site operating environment is extremely bad. All the staff of the owner of the State Grid Xinyuan Zhangjiakou Fengguang Storage Demonstration Power Station Co., Ltd. insisted on eating and living in the first line of the project construction, reasonably grabbing the hoisting sequence, and trying to help the relevant construction units coordinate the external hoisting resources under the conditions of sufficient protection of the cold goods on site. .

The National Scenery Storage and Loss Demonstration Project is located in Zhangbei County and Shangyi County of Zhangjiakou City. It was put into operation in 2011. It is the world's largest new energy project integrating wind power generation, photovoltaic power generation, chemical energy storage devices and intelligent output. . The first phase of the project test demonstration effect is significant, providing technical data support for the service of the country's new energy industry development.

Since its commissioning in 2011, the project has been operating safely and steadily for the third consecutive year. As of December 25, 2014, the project has produced more than 840 million kWh of high-quality green energy, including 590 million kWh of wind power, 250 million kWh of photovoltaic power, and 0.05 billion kWh of energy storage.

The project has solved many of the problems of large-scale centralized grid connection of new energy sources. For example, the project pioneered the wind and light storage and joint power generation technology route, and built the first intelligent source network friendly wind farm in China, the first power-regulated photovoltaic power station in China and the world's largest multi-type chemical energy storage power station; The first large-scale new energy combined power generation "black start"; permanent magnet direct drive 5 megawatt wind turbine created a number of industry "most", becoming a new highlight of the demonstration.

The first phase of the project has initially established a standard system for wind and light storage combined power generation. The complementary mechanism and system integration of wind and light storage combined power generation, wind power storage combined power generation monitoring, large-scale multi-type battery energy storage power station integration and control technology have reached the international leading level. The utilization rate of the first-stage wind farm is 98%. The energy storage power station has the conditions to achieve 24 hours of uninterrupted participation in combined power generation, and can flexibly switch between the “smooth fluctuation” and “peak clipping” modes.

There are many different types of wind turbines in the first phase of the project, and unified regulation of them is a major technical highlight of the demonstration project. The wind power control integrated system independently developed by the project can break the barriers that the fan communication protocols of different manufacturers are not open and cannot directly “conversation”, so that the information on the wind farm can be transmitted synchronously in real time, so that the fans can “listen” to the dispatching instructions.

In the past three years, under the framework of smart grid technology, relying on the first phase of the project, State Grid Xinyuan Zhangjiakou Fengguang Storage Demonstration Power Station Co., Ltd. has led the preparation of 4 national standards, and issued 6 national enterprise grid enterprise standards; 7 national science and technology support plan All of them passed the formal acceptance of the Ministry of Science and Technology, and two national 863 science and technology projects entered the field test and test stage. The direct drive and doubly-fed type wind turbines achieved major breakthroughs in high-voltage traversal transformation. The models and multiples were the first in China; demonstration project research results It has been promoted and applied to projects such as Dunhuang in Gansu and Dulan in Qinghai.

Fan hoisting site of the second phase expansion project

Fan hoisting site of the second phase expansion project

Since the second phase expansion project of the National Scenery Storage and Loss Demonstration Project started in May 2013, all parties involved in the project have continued uninterrupted operations, and have invested more than 100 large-scale machinery, with a total of more than 4,000 on-site staff. At the construction site, these participants were referred to as “wind trappers”.

Wu Tao, who is over half a year old, is the assistant general manager and director of the engineering department of the State Grid Xinyuan Zhangjiakou Fengguang Storage Demonstration Power Station Co., Ltd. After the first phase of the project was completed and put into production, Wu Tao gave up the comfortable working environment in the rear and continued to lead his staff to the construction of the second phase of the expansion project.

As the main person in charge of the project site, Wu Tao faces the heavy risks of short-term effective construction period, complicated geological structure, and large-scale engineering battles brought about by the construction of the second phase of the expansion project. The harsh construction environment and work arduously test the project. The willpower and ability to perform the "veteran".

"There are conditions to be on, and there are no conditions to create conditions to be on" is his principle of doing things. "Do everything possible, and work hard" has been truly reflected in him. For the lifting of 5 MW large wind turbines, starting from April 2014, Wu Tao led the relevant staff of the project department of the owner, together with the industry experts and engineering technicians to analyze the problems that may occur before and after lifting, one by one, according to the “guarantee”. The guiding principle of success and failure, repeated research, and easy drafting, prepared a well-prepared hoisting plan, and laid a solid foundation for ensuring the success of lifting 5 MW large wind turbines.

On the one hand, Wu Tao gave full play to his own resource advantages, effectively placed various tasks on the basis of engineering science and rapid advancement, and continued to strengthen the organization and construction of the site owner project department to fully ensure that the second phase expansion project was completed at the end of 2014. Based on the reversed schedule, scientifically compiling a three-level network plan, clearing the milestone nodes, and simultaneously promoting the wind, light, storage, and transportation work; on the other hand, he asked all staff to give full play to the core of the frontline construction. "With the role of "leading", and the design, supervision, construction units sincere cooperation, quickly form a centralized battle situation, and jointly establish a harmonious relationship of unity and battle.

In the construction site of the second phase expansion project of the National Scenery Storage and Transportation, a material team consisting of more than a dozen people, Fengguang Storage Materials Project Department, was active. The large-scale equipment such as fans used in the second-stage expansion project has accumulated more than 1,100 vehicles. The supply of materials is very complicated, and the materials such as reminders, acceptances, etc. are all completed by them.

Dai Zhigang, who has been working for 7 years, is the deputy manager of this project department. He has been working on the Zhangbei project site of the National Landscape Storage and Destruction Project for nearly 4 years, and participated in the material supply of the first phase of the project and the second phase of the expansion project. In 2014, Dai Zhigang went to various wind turbine equipment suppliers dozens of times, and traveled nearly 60,000 kilometers to and from various wind turbine manufacturers throughout the year.

Compared with the first phase of the project, the biggest difficulty in the supply of materials for the second phase of the expansion project is the short supply cycle and large supply, which has led to a sudden increase in supply pressure. In order to achieve on-time delivery, the project department arranges special personnel to update the materials, production and shipping of each material every day, and coordinate and track the manufacturers that are not in accordance with the plan, and correct various deviations at any time.

Arrival is a key link in the supply of materials. The project department arranges three groups of personnel to be responsible for receiving, accepting and handing over the goods. "Receipt receipt must be strictly done 'by comparison, according to the actual account', to prevent any misconduct." Dai Zhigang has been asking the staff, "If there is an error in the receiving link, it will not only affect The material work itself is more likely to have an impact on the construction, and it is not sloppy."

All along, the three groups of personnel of the project department have accurately completed the receipt and acceptance of each material in accordance with this requirement, and recorded all the problems in the reception, and filled out various documents according to the actual implementation. "Zero error" in the receiving link.

China's current mainstream wind turbines have a power of 1.5 megawatts, while direct-drive wind turbines have a power of 5 megawatts, which is about 3.3 times that of current mainstream wind turbines. The permanent magnet direct drive 5 MW large-capacity fan is the largest permanent magnet direct-drive fan with the largest single capacity on land in China, with a total height of 100 meters. Compared with the traditional horizontal-axis wind power system, the 5 MW direct-drive wind turbine has no gearbox, which reduces the transmission consumption and improves the power generation efficiency, especially in the low wind speed environment. At the same time, the fan does not have to change the gearbox oil regularly, which reduces the operation and maintenance costs.

However, the installation requirements of the permanent magnet direct-drive 5 MW large wind turbine are extremely high and difficult. Before the demonstration project, there is no successful hoisting scheme in China. The total weight of the fan equipment is 743 tons, the blade length is 62 meters, and the maximum sweeping diameter is 128 meters. When installing, the crane needs to weigh up to 1,250 tons, and the longest arm of the crane needs to reach 138 meters.

At present, there are two main ways of hoisting construction of domestic wind farms. One is to set up a temporary storage warehouse near the site. After the wind turbine equipment arrives, it is stored in a temporary warehouse. When it is installed, it is transported to the hoisting point twice. This method is only suitable. Lifting in small fans.

The other is to directly transport the fan equipment to the hoisting site for storage, no secondary transportation, and the fan equipment is in place at one time, which saves the transportation cost. At present, the fan of 2 MW and above adopts this method. However, this method requires that each hoisting site must have the conditions for storing all the equipment of one fan, and the location for hoisting equipment for large cranes and auxiliary cranes.

The 5 MW wind turbine hoisting of the National Scenery Storage and Demonstration Demonstration Base also adopted the second method. During the hoisting, 4 cranes, one main crane and three auxiliary cranes were used, of which the main crane hoisted up to 1,250 tons and the crane was the longest. The arm is 138 meters and the hoisting area is 100 meters & TImes; 100 meters, twice the size of the 2 MW wind turbine lifting site.

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