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, which is applied in wind power generation, single-grid parallel feed arrangement, etc., can solve problems such as grid-side current distortion and unbalanced grid voltage, and achieve suppression of DC output voltage fluctuations, simple and direct control, and Effect of reducing grid side harmonic current

Inactive Publication Date: 2012-09-05
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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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 accompanying drawings and specific embodiments.

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

[0026] figure 2 It is the hardware structure diagram of the grid-side rectifier, including three-phase 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 DC side voltage of the rectifier and the grid voltage, and the current sensor measures the grid current, which is then converted into a digital signal by the sampling processing circuit and sent to the DSP controller. The DSP cont...

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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 cascaded brushless doubly-fed wind power generator grid-side rectifier, in particular to a power control method of the grid-side rectifier when the grid is unbalanced, and belongs to the fields of wind power generation technology and power electronics technology. 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 countries all over the world. Wind energy, as a renewable energy source, is becoming a new energy source that countries are competing to develop due to its mature technology, clean and pollution-free advantages. The traditional doubly-fed asynchronous wind generator has flexible active and reactive power control capabilities, and the converter used has a small capacity, and has become the mainstream of modern wind power generation systems, but there are brushes and sli...

Claims

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Application Information

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Patent Type & Authority Applications(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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