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Vector control based driving device of alternating current motor for pitch control system

An AC motor and control system technology, applied in the direction of controlling electromechanical transmission, control system, control generator, etc., to achieve the effect of protection from being burned, high reliability requirements, and fast dynamic response speed

Inactive Publication Date: 2012-12-19
SUZHOU NENGJIAN ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Judging from the current published literature, there are few domestic application cases involving AC drives with vector control for pitch control, so it is necessary to design an AC motor drive device for pitch control with excellent performance

Method used

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  • Vector control based driving device of alternating current motor for pitch control system
  • Vector control based driving device of alternating current motor for pitch control system
  • Vector control based driving device of alternating current motor for pitch control system

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Embodiment Construction

[0035] The inertia of the DC motor drive system is large. After the power level of the whole machine is increased, it will be difficult to manufacture, the volume will increase, and the cost will increase; the dynamic performance of the control after using the AC motor drive device with vector control is comparable to that of the DC motor, and the AC motor Both manufacturing and maintenance costs are low, which can greatly save costs, especially in pitch systems with power levels above 2MW.

[0036] According to the current development status of the AC motor drive device of the pitch control system, in order to simplify the design, improve the reliability of the drive device, and improve the control performance of the AC motor for pitch control, the present invention provides a pitch control with vector control with complete protection functions. Controls AC motor drives. Such as figure 1 As shown, it includes a power loop part and a control loop part controlling the power lo...

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Abstract

The invention provides a vector control based driving device of an alternating current motor for pitch control. The driving device comprises a power loop part and a control loop part, wherein the power loop part comprises a rectifying unit, an energy consumption brake unit, a power switch circuit, an alternating current input phase sequence detection unit and a bus voltage and output current detection unit, the control loop part comprises an analog signal sampling unit, a digital signal input sampling circuit, a speed signal acquisition unit, a digital signal output unit and a unit for information interaction with an upper computer, etc. In control, a vector control technology is adopted. The vector control based driving device has a same good control effect as that of a direct current driver and is excellent in dynamic property and suitable for controlling an alternating motor for a high-power pitch control system. Compared with the direct current driver at the same power level, the vector control based driving device is low in cost and is improved in both control performance and reliability.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to the control technology of an AC motor for wind power generation, in particular to a closed-loop vector control driving device for an asynchronous motor of a pitch control system. Background technique [0002] As a renewable and clean energy with mature technology, wind power has been widely valued by various countries. The pitch control system is an important component of the wind power generation system. Its main function is to control the pitch angle of the blades by the pitch drive motor to automatically adjust with the wind speed: at low wind speeds, the wind turbine has the maximum starting Torque; when the wind speed is too high, change the angle of attack of the airflow on the blades, and then change the aerodynamic torque obtained by the wind turbine to keep the output power of the generator stable. [0003] At present, the power of domestic wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P1/40H02P6/08H02H7/08H02P6/17H02P21/18
Inventor 孙明敏傅建民
Owner SUZHOU NENGJIAN ELECTRIC
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