Wind power generation technology

1. Wind measurement and location

Wind is a resource for wind power generation. Wind power must be measured in a certain area. It is not enough to use only wind energy data from nearby weather stations. It is necessary to install 2-3 wind towers on selected wind farms for wind measurement over the year. The data of wind speed, wind direction and wind frequency were obtained for 10 meters high and 40 meters high respectively, and the wind direction rose graph was drawn. According to the measured data and with reference to the local topographic conditions, traffic conditions and access conditions, etc., decide whether to build a wind farm here.

After the wind field is selected, it is also necessary to determine the position of each fan. This is the micro site selection. WASP software is usually used to input various data such as wind energy, weather, terrain and geomorphology, and is completed by computer complex calculations. Of course, the field experience of wind engineers is also very important. Micro site selection can not be ignored. If the site selection is improper, the output power of two adjacent 200-meter fans may differ by more than 25%.

2. Independent operation and grid-connected power generation

Wind power can be divided into independent operation and grid-connected power generation. As the name implies, independent operation means that it is not connected to the grid and supplies power to households or villages alone. This is to use wind power as a supplementary energy source. In order to ensure the continuity of the power supply, the battery can be used to store energy or run in parallel with the diesel engine. The stand-alone capacity of independent wind power systems is generally less than 20 kilowatts. The following is a schematic diagram of an independent wind power system.

Grid-connected power generation is the integration of wind power generation systems into large grids, enabling users on the grid to enjoy green energy. This is the development of wind power as an alternative energy source, and it is also the development direction of wind power. The wind turbines listed above all refer to grid-connected power generation. There are many problems in grid-connected fans that need to be studied, how to solve grid-connected problems, and the impact on grid power quality after grid-connection. The problem of grid stability after a large number of wind turbines is connected also needs to be solved.

3. Installation, operation and maintenance

It has been stated that the current mainstream capacity of grid-connected wind turbines is 600-1000 kW. Taking a 600-kilowatt fan as an example, the tower is 45 meters high and weighs nearly 30 tons; the cabin weighs more than 20 tons; the blades are more than 20 meters long and weigh more than 2 tons. For such a giant, 200 tons of cranes are required for installation, and it is necessary to have a good foundation and fail to fall through a class 12 hurricane. Before installation, the road to the site must be repaired and the transmission lines laid. And there is enough lifting work surface in front of each fan. Wind power is characterized by distributed power, and each unit can be integrated into the power grid immediately.

The operation of the fan is completely automated and unattended. You sit in front of the computer in the control room and you can see the operating conditions of the fan and read various parameters. If there is a problem, it will automatically alarm and indicate what kind of fault. Some bugs can be ruled out before the computer and restore the fan's normal operation.

Although the fan can run automatically, it must be a mechanical device with many moving parts. This requires us to seriously safeguard, regular inspections, found that the noise is wrong, to find out the reasons; some loose fasteners, to be immediately tightened; according to the requirements of the operating manual, regular refueling and replacement of wearing parts. Strengthening maintenance is the key to improving fan life and reducing power generation costs.