New technology for power generation of wind turbines
The key factor for the high cost of wind power generation is that the cost of wind turbines is as high as 70% of the investment in wind farms. This has become one of the important reasons why wind power cannot compete directly with thermal power and hydropower, and government subsidies must be introduced.
Chinese patent application 201010571789.8, an energetic wind turbine system, is a new technology that can reduce the power generation of existing synchronous wind turbines and obtain more wind energy from various wind speeds. Effectively reduce wind power costs and improve the market competitiveness of wind power.
After several years of research and development of wind turbine energy-increasing technology, we have completed the industrialization of the energy-enhancing technology of synchronous wind turbines.
The energy-enhancing mechanism of synchronous wind turbines is:
In the breeze, the unit can reduce the cut-in wind speed, start generating electricity in advance, and get more energy from the breeze.
In the mid-speed stage, the unit increases the power generation by increasing the efficiency of the generator and gains more economic benefits from power generation.
In the rated wind speed and rated wind speed stage, the unit can improve the rated power of the generator and increase the maximum output power of the unit to obtain the maximum economic benefit.
The new technology can increase the output power of the generator by about 15%. While the power of the generator is increased, the total loss (generator iron loss and copper loss) remains unchanged, which makes the actual efficiency of the generator not used. The generator before the technical transformation is high. That is to say, for generators, this energizing technology may increase the rated power of the original generator by 15% at zero cost.
The generator sets used in the existing wind farms mainly include two types of asynchronous and synchronous types, and two types of asynchronous ones are old-fashioned cage type fixed speed machines with a power of less than 1 MW, which are already in the process of elimination; Part of the variable speed dosing machine of the MW class or above. The energy-increasing technology for asynchronous wind turbines is under development. This paper only recommends the energy-increasing technology of synchronous wind turbines.
As we all know, the synchronous wind turbines in the mainframe are more advanced than the asynchronous ones, mainly the direct-drive machines of several MW grades, including low-speed permanent magnet direct drive, low-speed excitation direct drive and medium-speed semi-direct drive. Synchronous machine; in addition to high-speed permanent magnet machine with gear box or high-speed exciter, brushless exciter and other models.
