Direct-current excitation synchronous wind generating set

Abstract

The invention relates to a direct-current excitation synchronous wind generating set, which is characterized by comprising an impeller, a base, and a gear box, a speed-adjusting mechanism and a synchronous generator which are fixed on the base, wherein the speed-adjusting mechanism is provided with a target rotating speed value, and the synchronous generator is provided with a target voltage value; and a wheel pivot on the impeller is fixedly connected with one end of a movable shaft, the other end of the movable shaft is connected with a low-speed shaft of the gear box, a high-speed shaft of the gear box is connected with an input end of the speed-adjusting mechanism at the same time, a constant speed output end of the speed-adjusting mechanism is connected with a rotor in the synchronous generator, and a stator of the synchronous generator is connected with an input end of a power grid. The direct-current excitation synchronous wind generating set has good idle support capability, can transmit stable electrical energy for the power grid, and can be applied to regions with rich wind energy resources.

Description

technical field [0001] The invention relates to a grid-connected wind power generator set, in particular to a DC excitation synchronous wind power generator set. Background technique [0002] my country has a vast territory, long coastline, and abundant wind energy resources. According to more than 900 meteorological stations in the country, the height of 10m above the ground is estimated, and the national average wind power density is 100W / m 2 , the total reserves of wind energy resources are about 3.226 billion kW, the wind energy reserves that can be developed and utilized on land are 253 million kW, and the wind energy reserves that can be developed and utilized offshore are 750 million kW, totaling about 1 billion kW. If the annual on-grid power of onshore wind power is calculated at 2,000 hours of equivalent full load, it can provide 500 billion kWh of electricity per year; the annual on-grid electricity of offshore wind power is calculated at 2,500 hours of equivalen...

AI Technical Summary

Problems solved by technology

At present, the speed control devices of large-scale wind turbine generators are all at the rear end of the generator, using full-power frequency conversion or partial power frequency conversion. ) modulation, this method determines that the electricity generated by the generator will carry many high-order harmonics when it is transmitted to the grid, causing pollution to the grid

Although the harmonics can be reduced by improving the modulation waveform, it is still difficult to achieve the waveform effect achieved by the winding arrangement of traditional thermal and hydroelectric units.

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