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Establishment method of output harmonic current model of doubly-fed wind turbine

A doubly-fed wind turbine and harmonic current technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as amplitude and phase differences

Active Publication Date: 2020-09-01
ZHEJIANG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] (2) The harmonic current generated by the dead time of the machine-side converter will form a non-integral frequency harmonic current on the stator side after converting the slip frequency. There is a difference in sub-frequency harmonics compared to

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  • Establishment method of output harmonic current model of doubly-fed wind turbine
  • Establishment method of output harmonic current model of doubly-fed wind turbine
  • Establishment method of output harmonic current model of doubly-fed wind turbine

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Embodiment Construction

[0067] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0068] Such as figure 1 As shown, the doubly-fed wind turbine is mainly composed of two parts, namely the grid-side converter and the LC filter ( figure 1 Part 1 in), doubly-fed wound asynchronous generator and machine-side converter ( figure 1 2 parts in ). Due to the DC bus capacitor C of the doubly-fed wind turbine s Larger, the DC bus voltage can be regarded as constant under the voltage outer loop control of the grid-side converter, so parts 1 and 2 are isolated and decoupled by the DC bus capacitor, so the stator output harmonic current and the grid-side converter output Harmonic currents can be analyzed separately.

[0069] The method for establishing the output harmonic current model of the doubly-fed wind turbine based on the harmonic current...

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Abstract

The invention discloses a harmonic current transfer function-based output harmonic current model building method of a doubly-fed wind power generator set. A mathematical analysis model of a harmonic current with an integer frequency or a non-integer frequency output from the doubly-fed wind power generator set is built by considering a power grid background harmonic voltage and a dead region effect, the integer frequency component comprises a harmonic current generated by a network-side converter under the power grid background harmonic voltage effect, a harmonic current caused by a network-side converter dead region and a harmonic current generated by a doubly-fed motor stator side under the power grid background harmonic voltage effect, and the non-integer harmonic current output from the stator side is caused by the harmonic voltage of a motor-side converter dead region. Simulation and experiment verify the accuracy of the built harmonic current model, and a method and a basis can be provided for harmonic estimation of multiple doubly-fed wind power generator sets and a wind power field.

Description

technical field [0001] The invention belongs to the technical field of doubly-fed wind turbines, and in particular relates to a method for establishing an output harmonic current model of a doubly-fed wind turbine based on a harmonic current transfer function. Background technique [0002] At present, my country's wind power has shown a trend of large-scale and centralized access to the power grid, and the grid-connected capacity of power generation is increasing day by day. There are many 10 million-kilowatt-level wind power stations across the country. The power quality of wind farms is an important indicator for supervising and evaluating large-scale new energy power plants and ensuring the safe operation of new energy power generation. The harmonic content of wind farm grid-connected current must be less than the requirements in the national standard GB / T 14549-1993. [0003] New energy grid-connected certification is an important means to supervise and assess the power ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00G06F30/20
Inventor 周骐年珩李庆朱琼锋
Owner ZHEJIANG UNIV