In wind power, water conservancy, tidal power, solar power and other power generation systems, variable speed power generation devices are required for optimum economic efficiency. According to the principle of the traditional generator, when the generator speed changes, the frequency of the output voltage will also change proportionally. If the variable speed generator is to be connected to the grid, it must go through the rectifier-inverter device. Due to the high cost of high-power inverter device, high cost, high failure rate, thus affecting the promotion of traditional variable speed generator applications.
In order to better meet the market demand for variable speed constant frequency generator, reduce the cost of new energy power generation and improve the safe operation of power grid, Qingdao Meihua Permanent Magnet Electrical Technology Co., Ltd. and Shandong University Distinguished Professor Wang Guangshun successfully developed the world's first Can be directly connected to the grid speed variable frequency generator. It can meet the requirements of reactive power regulation in grid-connected operation and can meet the technical requirements of low voltage ride through. To meet the requirements of grid-connected power quality standards, the generator not only eliminates the need for inverter devices, but also does not require front-mounted speed regulation system. This technology can significantly reduce the investment cost of variable speed constant frequency generator. At the same time, the generator also has such intelligent features as instantaneous active power control and flexible grid connection, and can be widely used in variable speed power generation systems such as wind power, water conservancy, tidal power, solar power and naval vessels.
Wind power generation is the most typical variable speed power generation equipment, its technical requirements are very high, involving a variety of cutting-edge technologies. The direct grid-connected variable speed constant frequency generator for wind power generation, can more fully play its technical and economic advantages.
1, to achieve a wide range of reactive power adjustment
General VSCF wind power generator can not directly meet the requirements of grid reactive power adjustment, even if the full power inverter wind turbine, in the case of grid failure, its low voltage ride through and reactive power output capacity can not be the main power grid Compared to the generator set. After the completion of large-scale wind farms, reactive power adjustment has become a major constraint on the grid. The newly developed direct-current variable-speed constant-frequency generator reactive power regulation and its low voltage ride through performance indicators are much higher than the current wind power grid technology standards and close to the main grid synchronous generator level.
2, low harmonic output
Straight and variable speed constant frequency generator with a combination of harmonic suppression design, so that the output voltage and current harmonic content control in the [standard] range. Low harmonic output is the basic requirement for grid-connected generator operation. Especially when large-scale wind power grid-connected, the problem of harmonic can not be solved will restrict the large-scale development of wind power. Straight and variable speed constant frequency generators have shown greater superiority in current harmonic control.
3, active power output curve is smooth and adjustable
Direct and variable speed constant frequency generator set using fuzzy control technology and inertial energy storage technology, can instantly complete the active power control, and maintain the generator active power output curve is smooth and adjustable. At the same time, it can also prevent generator set over-loading caused by turbulence and protect the safety of blades, tower and transmission system. The generator can also phase operation, to help solve the power grid over-voltage problems, thereby greatly improving the long-distance transmission of new energy power.
4, saving investment costs
Straight and variable speed constant frequency generator set minus the power electronics , so the whole set of generators and other forms of variable speed constant frequency generator cost dropped significantly, is conducive to wind power industrialization and large-scale development. Also because of straight and variable speed constant-frequency generator set has adopted a new technology route to improve the safety and economy, so that the life cycle of the unit cost of generating a larger decline. With the straight and variable speed constant frequency wind turbine power increases, its superiority will be more prominent. The unit can better meet the needs of large offshore wind farm construction.
5, improve safety and reliability
Straight and variable speed constant frequency units in the wind power generation using medium-speed design, the power transmission process without any speed control device, gear box directly connected with the generator, and the generator will be exported directly into the power grid, thus avoiding the inverter High-frequency pulse current of the impact on the coil, so the reliability of the converter than the way to improve the larger generators, downtime throughout the life cycle can be reduced by more than 20%.
6, to improve power generation efficiency
Straight and variable speed constant frequency generator can have a wider range of speed, lower the minimum operating speed, and allow the generator to overload operation within a certain period of time, thus effectively widening the wind speed of variable speed operation, making the generator equivalent use around the clock Hours significantly increased.
Straight and variable speed constant frequency generator in the field of new energy and variable speed drive has a wide range of application prospects, with the continuous improvement of this technology, in the near future with other forms of generating units can be jointly responsible for providing efficient clean energy to humans The task. This scientific and technological achievement is also an important technical contribution made by China to the new industrial revolution in the world and can promote the large-scale development of new energy and related industries. It will put an end to the fact that the core technologies of China's new energy industry rely solely on foreign countries. The technology has won the national invention patents. Direct-coupled variable speed constant-frequency generator with a new motor principle, is a leap in motor manufacturing technology, will certainly play an active role in promoting industrial upgrading in China.
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