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Method for controlling network side rectifier of brushless double-feed wind-driven generator under unbalanced electric network

A doubly-fed wind power generation and rectifier technology, applied in wind power generation, single-grid parallel feed arrangement, etc., can solve problems such as unbalanced grid voltage and grid-side current distortion, so as to suppress voltage fluctuations and reduce grid-side harmonic currents , control simple and direct effects

Inactive Publication Date: 2015-05-27
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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  • Claims
  • Application Information

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Problems solved by technology

In practice, the grid voltage is usually not balanced. At this time, if the grid-side rectifier is still controlled according to the control method under the ideal grid voltage, the double frequency fluctuation will be generated on the DC bus voltage and the grid-side current will be distorted.

Method used

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  • Method for controlling network side rectifier of brushless double-feed wind-driven generator under unbalanced electric network
  • Method for controlling network side rectifier of brushless double-feed wind-driven generator under unbalanced electric network
  • Method for controlling network side rectifier of brushless double-feed wind-driven generator under unbalanced electric network

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0025] figure 1 It is the control block diagram of the cascaded brushless doubly-fed wind generator when the grid is unbalanced, including wind turbines, gearboxes, cascaded brushless doubly-fed generators, control motor inverters and grid-side rectifiers, etc. The present invention mainly It is for the grid-side rectifier.

[0026] figure 2 It is the hardware structure diagram of the grid-side rectifier, including three-phase power grid, three-phase filter inductor, rectifier bridge main circuit, DC side capacitor, voltage and current sensor and sampling processing circuit, DSP controller and drive protection circuit. The voltage sensor measures the voltage on the DC side of the rectifier and the grid voltage, and the current sensor measures the grid current, which is then converted into a digital signal through the sampling processing circuit to enter the DS...

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Abstract

The invention discloses a method for controlling a network side rectifier of a tandem type brushless double-feed wind-driven generator under an unbalanced electric network, and aims to calculate given compensation values of active and reactive powers on a static coordinate system according to electric network voltage, delayed signals and active and reactive initial given values. The summation of the active and reactive initial given values and the given compensation values is a final power instruction value which is taken an unbalanced condition of the electric network voltage into account, then alternating-current side instruction voltage is calculated according to a mathematical model of the network side rectifier, and a driving signal of a switching device is obtained by using space vector pulse width modulation (SVPWM) decomposition. According to the method, transformation of rotational coordinates and decomposition of positive and negative sequence components are not required, second harmonic fluctuations of direct-current side voltage of the network side rectifier when the electric network voltage is unbalanced can be inhibited, and the network side harmonic current is reduced.

Description

Technical field [0001] The invention relates to a control method of a grid-side rectifier of a cascaded brushless doubly-fed wind power generator, in particular to a power control method of the grid-side rectifier when the grid is unbalanced, and belongs to the technical fields of wind power generation and power electronics. Background technique [0002] Due to the increasing shortage of conventional energy sources such as petroleum, the development of new energy sources has become a topic of concern to all countries in the world. As a renewable energy, wind energy is becoming an emerging energy that countries are competing to develop due to its mature technology, clean and pollution-free advantages. Traditional doubly-fed asynchronous wind generators have flexible active and reactive power control capabilities, and the converter capacity used is small, which has become the mainstream in modern wind power generation systems, but there are brushes and slip rings with high failure ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/46
CPCY02E10/76
Inventor 张永昌李正熙
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY
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