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Power control device and method used for low voltage ride through of direct-drive wind driven generator

A technology for wind power generators and low voltage ride-through, which is applied in the direction of control generators, control systems, reactive power adjustment/elimination/compensation, etc., and can solve the problems of insufficient and few PMSG wind turbines

Inactive Publication Date: 2014-04-30
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

This method does not require additional unloading hardware, but the existing improvement strategy is still not sufficient for the use of the PMSG wind turbine's own control means, rarely achieves cooperation with the pitch angle control, and cannot minimize the impact of low-voltage events on the direct drive. Impact of wind turbines

Method used

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  • Power control device and method used for low voltage ride through of direct-drive wind driven generator
  • Power control device and method used for low voltage ride through of direct-drive wind driven generator
  • Power control device and method used for low voltage ride through of direct-drive wind driven generator

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Embodiment Construction

[0057] The preferred examples will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0058] The overall control idea of ​​the present invention is as follows: figure 1 shown. The power coordination control module collects DC bus voltage, generator terminal voltage, generator terminal current, grid-side node voltage, grid-side converter output current, generator speed, grid-side active power, grid-side reactive power, propeller The distance angle and wind speed value, and the reference value of active power output from the receiver group of the maximum power tracking control module. The maximum power tracking control module provides a reference value of the output active power of the generator grid side according to the generator speed ratio to the maximum power tracking curve. According to the collecte...

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Abstract

The invention discloses a power control device and method used for low voltage ride through of a direct-drive permanent magnetic synchronous wind driven generator. The device comprises a generator speed measuring module, a direct current voltage measuring module, a generator terminal voltage measuring module, a generator terminal current measuring module, a grid measurement voltage measuring module, a grid measurement current measuring module, a maximum power tracking and controlling module, a grid measurement power measuring module, a wind speed measuring module, a pitch angle measuring module and a power coordination control module. The invention further provides the power control method, active power and reactive power of a unit in a temporarily stable state period can be coordinated and controlled, so that the direct-drive wind driven generator effectively achieves low voltage ride through in a maximum power tracking area and a power limiting area, and the unit can provide dynamic reactive support for a power grid in a low-voltage transient state period. The power control device and method can use the control means of the direct-drive wind driven generator self sufficiently and reasonably without adding unloading hardware, and the power control method is easy to implement and remarkable in effect.

Description

technical field [0001] The invention belongs to the technical field of power system operation and control, and in particular relates to a power control device and method for low-voltage ride-through of a direct-drive wind power generator. Background technique [0002] As a mainstream new energy power generation method, wind power has achieved great development in China. However, with the continuous increase of wind power grid-connected scale, wind turbine off-grid accidents caused by voltage drop caused by grid faults frequently occur. The low-voltage ride-through capability of wind turbines has become a key factor to ensure the safe and stable operation of the power system. [0003] Currently, the mainstream types of wind turbines include wind turbine with direct-driven Permanent Magnet Synchronous Generator (PMSG) and wind turbine with Doubly Fed Induction Generator (DFIG). . Compared with DFIG, PMSG omits the gearbox, and its wind wheel and generator rotor are connecte...

Claims

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Application Information

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IPC IPC(8): H02P9/04H02J3/38H02J3/18
CPCY02E40/30
Inventor 李庚银刘忠义刘崇茹李剑
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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