A hybrid excitation generator and induction generator coaxial joint operation generator

Abstract

The invention discloses a hybrid excitation generator and induction generator coaxial combined operation generator which comprises a wind wheel, a hybrid excitation generator, an induction generator, a converter, a wind speed measuring device, a switch box controller and a switch box. The wind wheel is coaxial with a rotor of the hybrid excitation generator and a rotor of the induction generator, and the hybrid excitation generator is excited by permanent magnets and electric excitation windings together. The wind speed measuring device detects wind speed, the switch box is controlled through the control box controller, and at low wind speed, the hybrid excitation generator is operated while the coaxial induction generator is in no-load operation; at medium wind speed, the hybrid excitation generator does not generate power and serves as a compensator to carry out reactive compensation on the induction generator, and a standby capacitor is not needed; at high wind speed, the hybrid excitation generator and the induction generator are operated in a combined mode. The hybrid excitation generator and the induction generator are respectively connected with the inverter through switches. The hybrid excitation generator and induction generator coaxial combined operation generator has the advantages of being simple in structure and high in reliability, safety and stability.

Description

technical field [0001] The invention relates to the field of electrical technology, in particular to a coaxial combined operation generator of a hybrid excitation generator and an induction generator. Background technique [0002] Traditional permanent magnet wind turbines rely on permanent magnets for excitation. However, due to the demagnetization of existing permanent magnets due to temperature, vibration, and oxidation, the reliability of the generator is challenged. Especially affected by vibration, the magnetic energy product of permanent magnets will decrease year by year Decrease, reducing the effective service life of the wind turbine. Temperature demagnetization is also a very big problem. The demagnetization curve points of permanent magnets are different at each temperature, which will affect the terminal voltage of the generator and the power generation of the wind turbine at different wind speeds. Because the voltage of the permanent magnet wind turbine is ver...

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Problems solved by technology

[0002] Traditional permanent magnet wind turbines rely on permanent magnets for excitation. However, due to the demagnetization of existing permanent magnets due to temperature, vibration, and oxidation, the reliability of the generator is challenged. Especially affected by vibration, the magnetic energy product of permanent magnets will decrease year by year. decrease, reducing the effective service life of wind turbines

Temperature demagnetization is also a very big problem. The demagnetization curve points of permanent magnets are different at each temperature, which will affect the terminal voltage of the generator and the power generation of the wind turbine at different wind speeds.

Since the voltage of the permanent magnet wind turbine is very small at low speed, and the inverter requires a certain high voltage, it is difficult for ordinary permanent magnet wind turbines to achieve

In addition, since the excitation of the permanent magnet generator cannot be changed, its voltage adjustment rate is very large

For different wind speed conditions, traditional permanent magnet wind turbines have poor ability to capture wind energy

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