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Method for operating a wind energy installation

A technology of wind energy device and control device, which is applied in the direction of output power conversion device, control generator, control system, etc., can solve the problems of high input cost, etc., and achieve the effect of good heat distribution, good power output, and high output current

Inactive Publication Date: 2014-05-28
伍德沃德肯彭有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, relatively speaking, this would involve significantly higher input costs

Method used

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  • Method for operating a wind energy installation
  • Method for operating a wind energy installation
  • Method for operating a wind energy installation

Examples

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Embodiment Construction

[0023] FIG. 1 shows a circuit diagram of a single-phase inverter, which is known in the prior art. Transistor circuits 1 , 2 usually designed as IGBT modules together with parallel-connected energy storage diodes 3 , 4 are provided to flow through corresponding positive or negative current. For example, the IGBT module 1 together with the storage diode 4 is provided for positive-signed currents. Conversely, the IGBT module 2 together with the energy storage diode 3 is suitable for the opposite situation. The IGBT modules 1 , 2 and the energy storage diodes 3 , 4 are connected to a power supply V, which can be, for example, the intermediate circuit voltage of an inverter. Now, the voltage-time diagram in FIG. 2 a) shows the curve of the control voltage 6 and the associated auxiliary voltage 7, which is used to control the inverter, the auxiliary voltage in the conventional pulse width modulation method adopted in. The corresponding IGBT module is switched on or off at the i...

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Abstract

The invention relates to a method for operating a wind energy plant having a double-fed asynchronous machine, at least one inverter and at least one control device, wherein electrical energy is at least partly supplied into a grid via the inverter, the inverter comprises per phase at least one power semi-conductor module with at least two transistor circuits and at least two free-wheeling diodes and the inverter by using the control device is actuated at least at times via a pulse width modulation (PWM). The object, namely of providing a generic method for operating a wind energy plant in which an improved power output is effected even in the low-noise rotational speed range of the rotors, is achieved in that, at frequencies of the current to be impressed by the inverter on the machine side of less than 10 Hz, preferably less than 6 Hz, the switching-on duration and / or the switching frequency of the transistor circuits and / or of the free-wheeling diodes of the inverter are altered via the control device by taking their thermal heating into account.

Description

technical field [0001] The invention relates to a method for operating a wind energy installation with a doubly-fed asynchronous machine, at least one inverter and at least one control device, wherein at least part of the electrical energy is fed via the inverter To the grid, the inverter comprises, in phases, at least one power semiconductor module having at least two transistor circuits and at least two energy storage diodes, and the inverter is at least partially Control is performed by pulse width modulation (PWM). The invention also relates to a computer program and a computer program product for carrying out the method with a processor, and also to a control device for a doubly-fed asynchronous motor of a wind energy installation and a wind energy installation. Background technique [0002] In wind energy installations, high demands are placed on both efficiency and silence. Since the increase in the noise of the wind energy installation is accompanied by an increase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/08H02P9/00
CPCH02P29/0088H02P9/007H02M1/08H02P2009/004H02P2101/15H02P29/68
Inventor 斯特凡·恩格尔哈特安杰伊·热尼尤茨
Owner 伍德沃德肯彭有限公司
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