Give LZ something practical and summary. I currently work for a giant wind power company and have a certain degree of authority
The latest trends:
1. Onshore wind power onshore turns to offshore wind power offshore;
2. High-speed wind turbines are turning to low-speed wind turbines
3. Large-scale wind farms are connected to the grid and shifting to distributed wind power generation
Trends in the wind power industry:
1. Specific See http://www.cnstock.com/index/gdxw/201108/1463061.htm
To meet the grid connection guidelines, 18 wind power standards have been announced on August 5: The National Energy Administration released it on the 5th There are 18 important standards such as "Technical Specifications for Grid Connection Design of Large Wind Farms", which involve technical standards urgently needed for the development of the wind power industry such as large wind farm grid connection, offshore wind power construction, wind turbine condition monitoring, wind farm power quality, and key wind power equipment manufacturing requirements. .
2. The low-voltage ride-through LVRT capability does not meet the requirements, the artificial short-circuit test fails, and the reactive power compensation is incomplete. These three problems are headaches for major wind farms. This is also the reason for the large-scale off-grid accident of Jiuquan wind farm in Gansu Province
Why is it difficult for wind power stations to connect to the grid? What energy storage methods are used in China's wind farms to ensure uniform power supply?
Currently, wind power plants are built in mountainous areas or plains, and the cost per kilowatt is 7,000 to 8,000 yuan. If you invest in offshore wind power, the cost is much higher, with the cost per kilowatt being 10,000 yuan or even higher. Nowadays, small wind power plants have an installed capacity of 50,000 kilowatts, and the investment is 350 to 400 million yuan. The above refers to investment by state-owned enterprises, but there are also individuals who invest in the construction of wind power. The more important consideration for individuals in building wind power is to reduce investment indefinitely. When land acquisition, local officials and ordinary people will also understand that they cannot be treated equally with state-owned enterprises, which can save a lot. Design The government will pay more attention to optimized design and will not focus on face-saving projects like state-owned enterprises. In addition, manufacturers that are not the most well-known may be selected in the bidding process. Based on the above factors, the cost of kilowatts invested by individuals will be 10% to 20% lower than that invested by state-owned enterprises. The cost of a small wind power plant with an installed capacity of 50,000 kilowatts is 270 to 300 million yuan.
Not necessarily accurate, for reference only.
Henan spends 6.6 billion yuan to build a super large power bank. What significance does it have for the power supply in Xinyang area?
1 China’s wind power construction is promoted by the state and implemented by many state-owned enterprises. This is a kind of performance and has little to do with efficiency. There is private wind power, and they are all good places, places where power can be sent, otherwise the private sector will not invest;
2 The instability of wind power is a fait accompli, and it is the same everywhere. It is understandable that the power grid company is unwilling to accept it. The acceptance of wind power by the grid cannot reduce the capacity of thermal power plants, because once the wind disappears, thermal power units need to be started immediately to meet the load requirements of the grid, and thermal power plantsThe startup process of the generator unit is very long, and the coal consumption during this period is very large, which is very uneconomical and unsafe;
3 Now the power grid company requires that new wind power plants must be equipped with energy storage facilities. Currently, battery packs are used to store energy. However, the capacity of the battery is not large and it is impossible to store a large amount of electricity. It can only solve a temporary problem and cannot solve the power supply capacity without wind for a long time;
4 The biggest problem with shelving wind power capacity is: The wind farms are all in the western desert. Many state-owned companies have built wind farms there, but there are no nearby lines to send the power out. It is very inappropriate to build lines specifically for wind power, because no matter how large the wind power is, its capacity is very small from the perspective of the grid and compared with thermal power plants. Dedicated one-circuit line has extremely low utilization rate and coupled with maintenance investment, it is very inappropriate.
What’s special about it is that it uses electricity to pump water and then generate electricity. It is an extra-large battery and power bank, like wind power and photovoltaic power. It is an intermittent and unstable power source. When the load is low, it operates in pumping mode and stores the excess electricity in the system as potential energy in the upper reservoir. Then perform power generation conditions during peak power consumption periods to improve the power supply capacity of the power grid.