"Three Gorges Wind Power" frequently encounters a deadlock in the industry

China's wind power industry has developed rapidly during the "11th Five-Year Plan" period and has doubled in five consecutive years. By the end of 2010, China's total installed wind power capacity reached 44.733 million kilowatts, which surpassed the U.S. to become the largest in the world, and the wind power grid-connected capacity reached 29.56 million kilowatts. Zhang Guobao, the former director of the National Energy Administration, said in an interview that wind power is basically profitable at present, but problems such as net surfing still exist. There are still many problems in the wind power industry that need to be studied and solved.

It is an inevitable choice to vigorously develop wind power in our country. First of all, China's wind energy resources are very rich, with a preliminary estimate of the installed capacity of 1 billion kilowatts, ranking first in the world. Second, from the perspective of environmental protection and sustainable development, China needs to change its current power structure with excessive thermal power and change its high-carbon structure, which focuses on fossil-fuel energy generation. This will require the development of clean and renewable energy such as wind power. According to estimates by experts, if China's wind power installation reaches 150 million kilowatts by 2020, it can save 100 million tons of standard coal annually and reduce carbon dioxide emissions by more than 200 million tons, which will greatly reduce the pressure on the environment.

The Three Gorges-scale wind farm has taken the lead in building “10 million kilowatts per year of power generation capacity in our country. There is no need for resettlement and no use of farmland. Why would we not do it?” Zhang Guobao, former director of the National Energy Administration, proposed that by 2020, China It is necessary to build several tens of thousands of kilowatts of wind power bases in Hebei, Mengdong, Mengxi, Jiuquan, Gansu, Xinjiang, and coastal areas of Jiangsu to create several “wind power triple gorges”.

"But the spring breeze is not the Yumen Pass." Jiuquan's greatest asset is windy. The squall blowing from the northwest blown away the soil. This place, where grass is not even long, is now striding step by step toward the blue sky of the “Three Gorges of Wind Power”.

To build wind farms in Jiuquan, a large number of wind turbines and steel blades are needed. Because of the large size of the blades, it is not possible to transport them from the coastal areas to Gansu, and they can only build factories in Jiuquan. This drives the development of the local machinery manufacturing industry. Today, wind power Equipment manufacturing has become the largest industry in Jiuquan.

From Lianyungang to Nantong, when the high tide rises, the tidal waters show a 20- to 30-kilometre stretch of beach. “This place can’t do anything else and it can't grow anything on the farm.” Zhang Guobao said, “Twenty kilometers are built. It is no problem for wind farms to send 10 million kilowatts of electricity every year. Isn't the Three Gorges more than 10 million kilowatts?"

Inner Mongolia is the region with the most abundant wind energy resources in China and the earliest development and utilization. The reserves of wind energy resources and the amount of technological development can all be ranked first in all provinces (autonomous regions and municipalities) in China. Saihanba is only one of the regions with better wind power development. As of the end of 2007, Inner Mongolia has built wind farms in seven leagues (cities), with a total installed capacity of nearly 1.6 million kilowatts, ranking first in the national wind power installation.

Analysis of Profitability of Wind Farms under Benchmark Electricity Pricing Currently, according to the state of wind energy resources and project construction conditions, China divides the country into four types of wind energy resource regions and formulates wind power benchmarking on-grid tariffs accordingly. The wind power benchmark price levels in the four resource regions are respectively 0.51 yuan, 0.54 yuan, 0.58 yuan and 0.61 yuan per kilowatt-hour.

According to statistics, the current investment in wind farm construction is basically 8,000 to 10,000 yuan per kilowatt. According to 30% of its own capital investment, the equivalent full-load utilization hours are 1800 hours, and the cost of 50,000 kilowatt-hour wind farm electricity is 0.43 to At 0.53 yuan/kWh, this cost is already lower than the benchmark price of the National Development and Reform Commission. If we consider that the wind resources in Hebei and Inner Mongolia are better, the equivalent full-load hours can reach 2,500 hours, and the cost of electricity can be reduced to 0.32 yuan. If we add CDM (Clean Development Mechanism) revenue of around RMB 0.1 per kilowatt-hour for wind farms, the wind farms will be profitable by referring to the four benchmark electricity prices.

In this regard, the reporter asked the person in charge of several wind farms separately for confirmation, and reached the conclusion that whether or not the wind farm is profitable requires specific analysis of specific projects.

Huitengxile belongs to a class of wind farms. The head of the wind farm Zhang Jiawen told the reporter that the 0.51 yuan price is in the state of micro-profit preservation for wind farms. If CDM proceeds are added, wind farms can guarantee profitability.

Zhao Xianxiang, deputy general manager of Ningxia Power Generation Group Co., Ltd., said that the company's wind farm in Ningxia is 0.53 yuan/kWh. According to the classification, the new wind farm in the region should be 0.58 yuan/kWh in the future, even without CDM, Achieve better profitability. If the company’s own funds are high and the banks are small, the profitability will be stronger.

And Li Hongji, the investment department of Beijing North China Electric Power Industry Corporation, said that for his wind farm in Zhangbei, the price of 0.51 yuan is too low, and he must be higher.

China's wind power industry, "scissors constantly chaos," the rampant with the increase in wind power grid capacity, this year, some wind power bases continue to occur wind turbine off the network accident.

On February 24, the first wind farm of Jiuquan Jiuquan Wind Power Co., Ltd. suffered a cable head failure, resulting in the loss of 598 wind turbines of 16 wind farms nearby, with a loss of 840,000 kilowatts, accounting for 54.4 wind power output before the accident in Jiuquan. %. The State Electricity Regulatory Commission regards this accident as the “best accident on the grid” in China's wind power in recent years. A person in charge of the Jiuquan Jiuquan Wind Power Company told the reporter: “This is a curse for the small cables.”

On April 17th, a box-transformer high-voltage cable end of Ganhekou West Second Wind Farm of Guangzhou-Zhejiang Association of Wind Power Co., Ltd. penetrated, causing a series of reactions, resulting in detachment of 702 units of 15 wind farms. Loss output accounted for the pre-accident Jiuquan 54.17% of regional wind power output. The cause of the accident was the cable head. During an interview with this wind farm, the reporter saw that technicians were working overtime to update the cable heads.

On April 25, the Jiuquan wind power base again suffered an accident. Thousands of fans were off-grid and 1.53 million kilowatts of wind power was lost.

In Zhangjiakou, Hebei Province, an accident occurred on April 17 in Guojia Jiaxin Wind Farm. 644 wind turbines were off-grid and 850,000 kilowatts of wind power was lost, accounting for 48.5% of wind power output in the Zhangjiakou area before the accident.

According to the introduction of power grid companies, these accidents have reduced the frequency of the entire northwest grid main grid and the north China grid main grid. Since February 24th, three accidents occurred at the Jiuquan wind power base, respectively, rejection of wind power output of 840,000 kilowatts, 1.006 million kilowatts and 1.535 million kilowatts, but also constantly refreshed the history of China's wind turbine historical network off record.

“The large-scale removal of the wind turbine from the grid results in large fluctuations in the voltage and frequency of the grid system,” said Wang Ningzhuo, director of the Wind Power Technology Center of Gansu Electric Power Co., Ltd., “Directly to the safe and stable operation of the power system.”

If the wind turbine is not off-grid, the unfamiliar concept of “low voltage ride through” will not be frequently seen in the media. Now when it comes to wind power, it seems that we must talk about "low voltage ride through."

Low-voltage ride-through capability, in layman's terms, is that when a grid fault or disturbance causes a drop in the voltage at the grid connection point of the wind farm, the wind turbine can be continuously connected to the grid within a certain range of voltage drop to maintain the power generation operation capability and cannot be “discarded”. Grid to reduce grid fluctuations. According to the grid requirements, the wind turbine should be able to maintain 625 milliseconds without disconnection when the voltage drops to 20% of the rated voltage. As it turns out, the fan did not hold back even for 625 milliseconds.

The State Electricity Regulatory Commission, after investigating the three-times wind turbine off-grid accident, held that there are many problems in the construction quality of wind farm construction and the management of project quality is lax. At the same time, there are obvious defects in the construction technology level and quality management of 35 kV cables in wind farms at the same time, reflecting the insufficiency of construction, supervision and construction management in wind farm construction projects.

Zhang Guobao believes that the development of the wind power industry requires the concerted efforts of all parties. Government departments should do a good job in all aspects of planning, strengthen the regulatory role of wind power planning throughout the country, and establish a simultaneous planning and commissioning mechanism for wind power projects and supporting power grid projects; power grid companies must adopt various means to increase the acceptance capacity of wind power and expand the coverage of wind power. Improving the level of intelligence in the power grid; Wind farms need to improve their operational management capabilities, establish a strict and effective operating system, and in particular, improve the ability to forecast and forecast the weather; and the fans produced by equipment manufacturers must have the ability to resist power fluctuations.