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Method for controlling predicted duty cycles of doubly-fed wind power generation system grid-side converter

A technology of doubly-fed wind power generation and grid-side converter, which is applied in wind power generation, AC power input conversion to AC power output, electrical components, etc. needs, etc.

Active Publication Date: 2015-04-29
TIANJIN SAIXIANG M&E ENG CO LTD
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Problems solved by technology

However, most of the predictive control methods currently used in this field use the switching state as the optimization variable, and the switching frequency of the power converter changes in real time with different working conditions, which not only increases the difficulty of designing the filter inductor, but also affects the operating performance of the rectifier. Adverse effects; in addition, the steady-state control performance of the system is usually poor, making it difficult to meet the increasing application requirements

Method used

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  • Method for controlling predicted duty cycles of doubly-fed wind power generation system grid-side converter
  • Method for controlling predicted duty cycles of doubly-fed wind power generation system grid-side converter
  • Method for controlling predicted duty cycles of doubly-fed wind power generation system grid-side converter

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Embodiment Construction

[0044] The three-phase voltage value and three-phase current value of the power grid are obtained through the voltage and current sampling circuit, and the horizontal axis and vertical axis (α, β axis) components of the grid voltage value in the two-phase static coordinate system and the current value are respectively obtained after coordinate transformation. α, β axis components; the α, β axis components of the voltage value are obtained through the phase-locked loop to obtain the real-time phase angle θ of the grid voltage s , based on the phase angle, the direct axis and quadrature axis (d, q axis) components u of the grid voltage in the two-phase rotating coordinate system are obtained gd , u gq And current value d, q-axis component i d i q ;According to the mathematical model of the system and the voltage and current values, the voltage vector V 1 d, q-axis current change rate δ under action d,1 ,δ q,1 , the voltage vector V 2 d, q-axis current change rate δ under a...

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Abstract

The invention relates to a control method for a doubly-fed wind power generation system grid-side converter, and aiming at structure characteristics and control demands of the doubly-fed wind power generation system grid-side converter, provides a method for controlling predicted duty cycles of the doubly-fed wind power generation system grid-side converter. The method comprises the following steps: obtaining a three-phase voltage value and a three-phase current value of a power grid through a voltage and current sampling circuit, and obtaining a horizontal axis alpha component and a vertical axis beta component of the power grid voltage value, an axis alpha component and an axis beta component of the power grid current value under a two-phase stationary reference frame after coordinate transformation; obtaining a real-time phase angle theta(s) of the power grid voltage after the axis alpha component and the axis beta component of the voltage value are processed through a phase-locked loop, and determining three-phase optimal duty cycles da', db' and dc' through duty cycle equivalent reconstitution. The method provided by the invention is mainly used for controlling the wind power generation system grid-side converter.

Description

technical field [0001] The invention relates to a control method for a grid-side converter of a doubly-fed wind power generation system; specifically, it relates to a control method for predicting the duty ratio of the grid-side converter of a doubly-fed wind power generation system. Background technique [0002] The stator of the double-fed wind power generation system is directly connected to the grid, and the rotor is connected to the grid through a bidirectional power converter, such as figure 1 shown. When the wind speed changes, the motor speed changes. By controlling the frequency of the rotor excitation current, the stator frequency can be kept constant to realize variable speed and constant frequency power generation. During the operation of the double-fed wind power generation system, the power flowing through the rotor circuit is the slip power, which reduces the cost of the frequency converter. In addition, the double-fed variable-speed constant-frequency wind ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/386H02M5/458Y02E10/76
Inventor 宋战锋张天
Owner TIANJIN SAIXIANG M&E ENG CO LTD
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