Maximum available torque weak magnetic control method for permanent-magnet direct-drive wind turbine

A wind turbine, permanent magnet direct drive technology, applied in motor generator control, electronic commutation motor control, control system and other directions, can solve the problems of difficult parameter setting, complicated principle of field weakening control method of permanent magnet synchronous generator, etc. , to achieve the effect of simplifying the design

Active Publication Date: 2014-04-23
东方电气集团国际合作有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In order to overcome the problems that the existing direct drive wind turbine permanent magnet synchronous generator's magnetic field weakening control method is complex in principle and difficult to adjust the parameters, on the basis of fully combi

Method used

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  • Maximum available torque weak magnetic control method for permanent-magnet direct-drive wind turbine
  • Maximum available torque weak magnetic control method for permanent-magnet direct-drive wind turbine
  • Maximum available torque weak magnetic control method for permanent-magnet direct-drive wind turbine

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Example Embodiment

[0040] figure 1 It is a typical system block diagram of an existing permanent magnet direct drive wind turbine. The controlled object is a permanent magnet synchronous motor coaxially connected to the wind turbine, and the actuator is a back-to-back converter. The grid-side converter rectifies the grid voltage and maintains the converter's DC bus voltage constant, while the machine-side converter controls the permanent magnet synchronous generator to generate a specified torque and perform field weakening under appropriate conditions.

[0041] The control system of the generator-side converter mainly includes three parts, the torque and field weakening controller, the current loop controller, the rotor speed position measurement, and the current rotation conversion unit. The torque and field weakening controller generates a stator according to the current rotor speed value d axis 、q Shaft current given value , . The current loop controller is based on the stator dq Shaft cu...

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Abstract

The invention relates to the field of wind power generation, and specifically relates to a maximum available torque weak magnetic control method for a permanent-magnet direct-drive wind turbine. The method is characterized by comprising the following steps: obtaining a maximum wind energy tracking designing curve of the permanent-magnet direct-drive wind turbine: T<e><0>=MPPT(omega<t>), under a given rotating speed omega<t>, by taking a direct-axis current and a cross-axis current i<d> and i<q> as optimization variables, solving a constrained optimization problem in an off-line mode, taking i<dpt> and i<qpt> as the optimization variable solutions of the optimization problem, and obtaining weak magnetic currents of the maximum available torque weak magnetic control method, given i<d><0>=i<dpt>; changing a rotor rotating speed omega<t> by taking a proper step length delta omega<t>, i.e., enabling omega<t>= omega<t>+delta omega<t>; and connecting a series (omega<t>, i<d><0>) of points to form a curve so as to obtain a weak magnetic current given curve i<d><0>=MAT(omega<t>) under various rotating speeds. According to the particularity of wind turbine control, i.e., the overall control strategy of the turbine enables the torque instruction of a permanent-magnet synchronous generator and a current rotating speed to be in a one-to-one corresponding relationship, possibility is provided for simplifying the design of the weak magnetic controller of a wind turbine.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a maximum available torque field weakening control method for permanent magnet direct drive wind turbines. Background technique [0002] Permanent magnet direct drive wind turbines have been widely used in the field of wind power generation because of their compact structure and reliable performance. Megawatt-class large-capacity permanent magnet direct drive units generally use full-power back-to-back converters as the drive unit of permanent magnet synchronous motors. In order to capture more wind energy, when the wind speed is high, the operating speed of the permanent magnet synchronous generator is also high, which in turn makes the induced electromotive force of the generator also high. Due to the limited DC bus voltage of the back-to-back converter, if the electromotive force induced by the stator of the generator is too high, the generator cannot output enough active...

Claims

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Application Information

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IPC IPC(8): H02P21/00H02J3/38
CPCY02E10/76
Inventor 周宏林吴小田代同振刘静波
Owner 东方电气集团国际合作有限公司
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