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A method for improving the running stability of the mechanical transmission chain of a direct-drive wind turbine

A technology for mechanical transmission and wind turbines, applied in the control of generators, electrical components, control systems, etc., can solve the problems of slow response of mechanical actuators, affecting power quality, active power oscillation, etc., to achieve rapid action, prolong service life, The effect of reducing the degree of distortion

Active Publication Date: 2016-01-20
STATE GRID CORP OF CHINA +1
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Problems solved by technology

For the former, due to the slow response of the mechanical actuator, and the design of the pitch angle control system needs to consider the dynamic characteristics of the shafting of the generator set, it is difficult to realize; for the latter, although the oscillation of the rotational speed can be alleviated quickly, it will cause The active power transmitted to the grid oscillates, which affects the power quality and puts pressure on other links of the grid operation

Method used

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  • A method for improving the running stability of the mechanical transmission chain of a direct-drive wind turbine
  • A method for improving the running stability of the mechanical transmission chain of a direct-drive wind turbine
  • A method for improving the running stability of the mechanical transmission chain of a direct-drive wind turbine

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Embodiment Construction

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0030] figure 1 It shows the schematic diagram of the outer ring structure of the converter active power control of the direct-drive wind turbine in the prior art; in the control system of the direct-drive wind turbine, the grid-side converter control adopts the grid voltage oriented coordinate system to realize the power transmission of the converter to the grid. The active power and reactive power are completely decoupled; the active power is controlled by the direct axis (d axis) current, and the reactive power is controlled by the quadrature axis (q axis); the direct axis current reference value i dref obtained by the active power control outer loop, as figure 1 As shown, that is, the direct axis current reference value i dref The voltage reference value U of the DC ca...

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Abstract

The invention provides a method for improving operation stability of a mechanical transmission chain of a direct-drive wind turbine generator. A data collecting card collects an operation variable X of the direct-drive wind turbine generator in real time. The method comprises the specific steps that 1, a mechanical transmission chain stabilization system is set according to the operation variable X and mechanical characteristics of the mechanical transmission chain; 2, the mechanical transmission chain stabilization system carries out filtering processing on the operation variable X; 3, the mechanical transmission chain stabilization system carries out dynamic compensation on a voltage reference value of the direct current capacitor end of a converter of the direct-drive wind turbine generator. Compared with the prior art, the method is simple in operation and easy to achieve. Mechanical transmission chain vibration of the direct-drive wind turbine generator caused by rotation speed changes can be quickly relieved, and the influence on unit output active power and power grid electric energy quality is little.

Description

technical field [0001] The invention relates to a method for improving the operation stability of a mechanical transmission chain, in particular to a method for improving the operation stability of the mechanical transmission chain of a direct drive wind turbine. Background technique [0002] In recent years, variable-speed constant-frequency wind power generation technology has become a research hotspot in the field of new energy power generation; compared with constant-speed constant-frequency wind turbines, variable-speed constant-frequency wind turbines can The maximum wind energy capture can be realized in the interior, so that the utilization rate of wind energy can be greatly improved. The current mainstream variable-speed constant-frequency wind turbines include double-fed wind turbines based on doubly-fed asynchronous generators and direct-drive wind turbines based on synchronous generators; [0003] The direct-drive wind turbine is directly connected to the power ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P9/00
Inventor 张磊赵大伟姜达军王湘艳朱凌志陈宁钱敏慧赵亮葛路明
Owner STATE GRID CORP OF CHINA
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