A hybrid drive wind power generation system

Abstract

The invention relates to a hybrid transmission wind power generation system which comprises an impeller, a speed-increasing planetary gear train, a flow-dividing device, a synchronous power generator and a speed-adjusting hydraulic system, wherein the impeller is connected with an input shaft of the speed-increasing planetary gear train; the flow-dividing device comprises a first gear pair, a flow-dividing planetary gear and a second gear pair; the first gear pair comprises a first gear and a second gear which are meshed; the flow-dividing planetary gear comprises a planetary carrier, a sun wheel, a planetary wheel and a gear ring; the second gear pair comprises a third gear and a fourth gear which are meshed; the speed-adjusting hydraulic system comprises a variable hydraulic pump, a constant-displacement hydraulic motor, an energy accumulator and an oil tank. The hybrid transmission wind power generation system adopts a mechanical-hydraulic hybrid transmission mode and integrates characteristics of high efficiency of mechanical transmission and flexible transmission of hydraulic transmission; moreover, the synchronous power generator is connected with the sun wheel of the flow-dividing planetary gear, and a gear ring of the flow-dividing planetary gear can avoid faults caused by high-speed rotation.

Description

technical field [0001] The invention belongs to the field of wind power generation, and in particular relates to a hybrid transmission wind power generation system. Background technique [0002] The operating environment of the wind power generation system is complex, there are many working conditions under different loads, and the load value is variable, so that the speed and torque of the transmission components such as the gearbox and the impeller spindle fluctuate violently, resulting in frequent failures of the transmission device of the wind power generation system. Repair costs remain high. With the trend of large-scale wind power generation system and expansion of offshore wind power, the problem of operation and maintenance cost of wind power generation system becomes more prominent. According to statistics, the maintenance cost of gearbox failures in wind power generation systems is the highest, and the high incidence of gearbox failures occurs within 5 to 8 years...

AI Technical Summary

Problems solved by technology

However, compared with gearbox transmission, the overall efficiency of hydraulic transmission is low

Moreover, the hydraulic pump connected to the impeller needs to have the characteristics of large displacement and low speed, which requires professional design and manufacture, which greatly increases the cost

[0005] The invention patent with the publication number CN103277252A discloses a mechanical-hydraulic hybrid transmission for grid-connected wind power generation systems. The mechanical-hydraulic hybrid transmission directly connects the generator with the ring gear of the planetary gear train, resulting in the ring gear It needs to rotate at a high speed synchronously with the generator, and the high speed of the ring gear will easily cause the planetary gear train to fail and damage it

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