Wind power equipment manufacturers to increase research and development to solve the problem of grid connection

The "Regulatory Report on Wind Power and Photovoltaic Power Generation" issued by the State Electricity Regulatory Commission recently revealed that the wind power grid connection problem is again exposed to the public. The "Report" pointed out that in the first half of 2010, the number of wind-rejections caused by the inability of domestic wind farms to access the Internet reached 2.776 billion kWh, and nearly one-third of the country's wind turbines were idling. The reason why this phenomenon is caused is that the wind power development plan focuses on resource planning, lacks specific wind power transmission and wind power consumption schemes, and on the other hand, it is caused by the lack of synchronization between wind farm construction and power grid construction.

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Inconsistent development of the latest data shows that China’s wind power installed capacity in 2010 reached 41.827 million kilowatts, which has surpassed the United States as the world’s largest installed wind power generator. At the same time, China's wind power generation capacity is only 50 billion kwh, still lower than the United States, and the capacity of the grid connection is only about 30% of the lifting capacity, which is far below the international level, which seriously affects the improvement of wind power efficiency and efficiency.

The "Report" shows that from January to June 2010, wind power did not purchase 2.776 billion kwh of electricity. In terms of sub-regions, the amount of wind power that was not acquired in North China was 1.588 billion kwh, accounting for 57.2% of the nation's total non-acquisition electricity; and the non-acquired wind power in Northeast China was 1.064 billion kwh, which accounted for 38.33% of the country’s total unreceived electricity.

In terms of regions, Inner Mongolia did not purchase wind power at a maximum of 2.101 billion kWh, accounting for 75.68% of the country’s total unsold electricity, which was 43.4% higher than its national electricity consumption; Jilin did not purchase wind power at 260 million kwh; Hebei In Gansu and Heilongjiang, between January 2009 and June 2010, wind farms had not acquired wind power of about 300 million kWh.

The contradiction with the reality of a large number of abandoned winds in the wind farm is that the speed of wind power integration in China has been maintained at a relatively high speed in recent years.

According to the latest data from China Electricity Council, as of the end of 2010, China's wind power interconnection capacity reached 31.07 million kilowatts, which has doubled in five consecutive years. In order to support the development of wind power and large-scale consumption, the State Grid Corporation of China has stepped up its efforts in power grid construction in recent years. By the end of 2010, the State Grid Corporation had invested a total of 41.8 billion yuan, and built 23,200 kilometers of wind power interconnection lines.

Although the construction of the power grid is so “fast”, it is still difficult to catch up with the construction of the wind farm, and the construction of the wind farm is not coordinated with the construction speed of the power grid.

It is reported that in order to solve the problem of wind power grid connection at an early date, the State Grid will accelerate construction of the “Three Chinas” UHV AC synchronous power grid in North China, Central China and East China during the “12th Five-Year Plan” period, in order to resolve the problem of new energy access to the Internet. According to the plan, by 2015, the “Three Chinas” UHV power grid will form a “three vertical and three horizontal and one ring network”. The Ximeng, Mengxi, Zhangbei and Northern Shaanxi energy bases will pass three vertical UHV AC channels to “three China’s “transmission of electricity”, northern coal-fired power, and southwest hydropower were transmitted to the North China, Central China, and Yangtze River Delta UHV ring networks via three horizontal UHV AC channels.

In addition to the lag in grid construction, the reason for the mechanism is one of the reasons why wind power is difficult to access.

Xu Ruilin, Jiangsu Provincial Renewable Energy Association, said that as of the end of October 2010, the total installed capacity of onshore wind power in Jiangsu Province was about 1.4 million kilowatts, with normal power input. Wind farms that have been fully operational for one year generally exceeded 2000 hours. Jiangsu is currently working hard to build the “Three Gorges at Sea”. By 2020, offshore wind power in Jiangsu Province will have an installed capacity of more than 10 million kilowatts.

Although wind power has developed rapidly, it is still faced with many difficulties to realize the best use of wind power.

"In addition to the technical bottlenecks in the integration of wind power, there are more institutional problems," Xu Ruilin said. In grid-connected technology, Jiangsu Province has taken precautions. Jiangsu coastal wind power will adopt the principle of adapting measures to local conditions, and it will be scattered and accessed in the near future and will be relatively concentrated in the long-term, and it will be reasonably matched with the regional zoning pattern of power grid planning. When wind power is not very large, nearby public access points are dispersed and the impact on the voltage and power quality of a single substation is reduced.

However, the coordination of power supply construction and power grid construction for wind power projects needs to be strengthened. Due to the relatively simple work flow in the early stage of the wind power project, the approval progress is fast, and the construction period is relatively short. The grid access system is relatively complex in terms of project review, program determination and project construction, making access system engineering and wind farm construction difficult in some places. The simultaneous completion and the fact that the grid level does not reach the actual demand of the wind farm have caused the fan to idling.

In this regard, experts suggest that the problem of difficult domestic wind power access to the Internet must fully consider the appeal of wind power generation companies and power grid companies, and solve them in an integrated manner. During the feasibility study of the wind farm project, it is necessary to actively communicate with the local power grid companies and start construction after the wind power transmission and consumption plans are approved by the power grid companies.

R & D to resolve the problem of grid-connected domestic wind power grid connection difficulties, one of the technical reasons is that the wind power to see the sky to eat, power generation is not stable. To this end, wind power equipment manufacturers are currently increasing research and development efforts to solve technical problems.

Jin Yuan, director of the grid-connected research department of Goldwind Technology (002202, stocks), told reporters: The grid-connected problems encountered by wind power are mainly caused by the distance between the wind power resources distribution area and the power load area. As a wind power equipment supplier, Goldwind will focus on solving technological bottlenecks, providing grid companies and customers with better solutions for wind power management, and wind turbines with superior quality and reliability for power grid operation and superior grid-connected performance. For example, the energy management platform of the Goldwind Wind Farm, which can realize the voltage and power control of the wind farm's grid point, can realize the low-voltage ride-through capability for the stable operation of the wind turbine when the grid fails.

Some people think that if the wind power grid connection problem cannot be solved in the short term, the installed speed of domestic wind power will be affected. However, industry experts and companies have expressed relatively optimistic about this.

Wang Jing, an analyst at Hongyuan Securities (000562), said that in terms of wind power, although China has surpassed the United States as the world’s largest wind power installation country, wind power generation is only at the end of 2009 from the perspective of wind power generation. It is 0.70% of the total power generation, and it rose to 1.04% in 2010. It is expected that the newly installed capacity during the 12th Five-Year Plan will exceed 50 million kilowatts, and the space is still huge.

Qiao Yuan also stated that the country has proposed a total strategic development target of 15% of total primary energy consumption for clean energy in China in 2020. This direction will not change, and the development of the wind power industry will continue to continue. China's wind power development is still good. prospect. However, due to the large base of annual installed capacity, the annual growth rate of 100% of newly installed capacity should not appear.

The annual growth rate of installed capacity will decrease. What will wind turbine equipment companies rely on to dominate the market? Qiao Yuan believes that in the future, Goldwind will increase investment in R&D to study the market demand, and develop a diversified fan product that meets different market segments with continuous technological innovation, such as high altitude, low wind speed, low temperature, Offshore, etc., for customers to discover and create value for wind power equipment companies to explore new profit growth points.