Low voltage ride through control method of permanent magnet direct drive wind power generation system with flywheel energy storage unit during power grid symmetrical short circuit default

A wind power generation system and low voltage ride-through technology, which are applied in wind power generation, control of generators through magnetic field changes, and single-grid parallel feeding arrangements, etc. And other issues

Inactive Publication Date: 2012-05-02
CHONGQING UNIV
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Problems solved by technology

However, the number of charging and discharging of the battery is limited, resulting in a short service life and increasing the operating cost of the system
On the other hand, considering the low withstand voltage of supercapacitors, it is not suitable for reliable application in high-voltage occasions such as wind power systems.

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  • Low voltage ride through control method of permanent magnet direct drive wind power generation system with flywheel energy storage unit during power grid symmetrical short circuit default
  • Low voltage ride through control method of permanent magnet direct drive wind power generation system with flywheel energy storage unit during power grid symmetrical short circuit default
  • Low voltage ride through control method of permanent magnet direct drive wind power generation system with flywheel energy storage unit during power grid symmetrical short circuit default

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Embodiment Construction

[0069] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0070] Such as figure 1As shown, a low-voltage ride-through control method for a permanent magnet direct-drive wind turbine with a flywheel energy storage unit when a symmetrical short-circuit fault occurs in the power grid, which includes a control object permanent magnet synchronous generator 8, a permanent magnet synchronous motor 9, and a motor-side converter 12 , the grid-side converter 13 and the flywheel motor-side converter 11 . Current Hall sensor 14 for permanent magnet synchronous generator three-phase stator current detection, current Hall sensor 15 for three-phase grid current detection, current Hall sensor 16 for permanent magnet synchronous motor three-phase stator current detection , a rotor position sensor 17 for detecting the rotor position of the permanent magnet synchronous generator, a rotor position sensor 18 for detecti...

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Abstract

The invention discloses a low voltage ride through control method of a permanent magnet direct drive wind power generation system. The control method simultaneously comprises control on a motor side converter, control on a power net side converter and control on a flywheel motor side converter. According to the invention, the power generation system can supply reactive power support to a power grid while a direct current chain voltage is stably controlled in the power grid failure process, so that the operation reliability and stability of the power generation system and the connected power grid during the power grid failure process are improved effectively.

Description

technical field [0001] The invention relates to the field of operation control of a permanent magnet direct drive wind power generation system, in particular to a low-voltage ride-through control method for a permanent magnet direct drive wind power generation system containing a flywheel energy storage unit when a symmetrical short circuit fault occurs in a power grid. Background technique [0002] With the continuous decline in the cost of high-power power electronic devices and permanent magnet materials, megawatt-level multi-pole low-speed brushless permanent magnet synchronous generators have gradually entered the field of engineering applications. Reliability and stability of power system operation. The power grid requires wind turbines to have low-voltage ride-through capability, that is, when a short-circuit fault occurs in the grid, wind power generation systems such as permanent magnet direct drive wind turbines can still be connected to the grid and provide power t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P9/14H02J3/38
CPCY02E10/763Y02E10/76
Inventor 姚骏陈西寅夏先锋廖勇熊倩
Owner CHONGQING UNIV
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