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DC electric machine variable pitch system and control method thereof

A technology of DC motor and variable pitch, which is applied in the storage system of electric energy, the control of wind turbines, the engine, etc. It can solve the problems of poor controllability of the motor and difficulty in effectively controlling the motor, so as to improve reliability and have little impact , the effect of reducing the used capacity

Inactive Publication Date: 2011-05-04
XUNJIE ZHUOYUE DRIVE SYST TECH BEIJING +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This scheme makes the controllability of the motor worse, and once the control device fails, it will be difficult to effectively control the motor

Method used

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  • DC electric machine variable pitch system and control method thereof
  • DC electric machine variable pitch system and control method thereof
  • DC electric machine variable pitch system and control method thereof

Examples

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Embodiment Construction

[0036] Combine below figure 1 , figure 2 The present invention is described further:

[0037] Such as figure 1 As shown, this embodiment includes a supercapacitor bank 1 , a step-up DC converter 2 , a DC motor 3 , a motor driver 4 and a charger 5 .

[0038] The supercapacitor bank 1 is respectively connected to the input end of the step-up DC converter 2 and the output end of the charger 5, and the input end of the charger 5 can be optionally connected to a three-phase or single-phase AC power supply as required. When the system works normally, the charger 5 charges the supercapacitor bank to the rated voltage value.

[0039] The motor driver 4 includes a rectifier bridge 6, a snubber circuit, a supporting capacitor, an overvoltage protection device, a drive bridge 7 and corresponding connections. The input and output terminals of the drive bridge 7 are connected to the DC bus bars P and N and the DC motor 3 respectively. The input of the motor driver 4 is connected to t...

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Abstract

The present invention belongs to wind power generation plant range, especially a DC electric machine variable pitch system. The system includes a motor driver, a DC electric machine, a super capacitorbank, a boost DC converter and a charger. The input terminal of the charger is connected with a three-phase or single phase AC power supply. One terminal of the super capacitor bank is connected withthe output terminal of the charger and the other terminal is connected with the input terminal of the boost DC converter. The output terminal of the boost DC converter is connected with input terminal of the DC electric machine via wires. When the system is power outages, the super capacitor branch can supply power to the motor system instead of the three-phase AC power supply immediately, and reliability of the system is improved efficiently. At the same time, because the super capacitor has a high energy efficiency, so the actual use of capacity is reduced and the system cost is reduced. The system comprises a dual control device of a DC convertor and a driving axle, which improving reliability of emergency variable pitch.

Description

technical field [0001] The invention belongs to the scope of wind power generation devices, in particular to a DC motor pitch variable system and a control method thereof. Background technique [0002] As the technical core of large-scale wind turbines, the variable pitch system can improve the stress on the blades, obtain the maximum air volume, improve the power generation efficiency and power quality of the unit, and can emergency feathering under ultra-high wind speed to ensure the safe operation of the wind turbine. [0003] The electric pitch control system uses a servo motor to adjust each blade individually. It has a simple structure and does not have oil leakage, jamming, etc., so it has attracted widespread attention. The DC motor is an important actuator in the electric pitch control system. [0004] The electric pitch control system is powered by a three-phase four-wire 380V power supply. In order to realize the emergency pitch change function after a fault or po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F03D7/00H02J15/00H02J7/00H02H3/20
CPCY02E10/72
Inventor 许家群
Owner XUNJIE ZHUOYUE DRIVE SYST TECH BEIJING
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