Nine-switch type double-fed fan system and control method

A double-fed fan, nine-switch technology, applied in wind power generation, single-grid parallel feeding arrangement, etc., can solve the problem of limiting the control performance of the system, without considering the interaction between the machine-side converter and the grid-side converter, and the nine-switch converter Problems such as less research on mathematical models

Pending Publication Date: 2019-11-05
TIANJIN CHENGJIAN UNIV
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Problems solved by technology

However, there are few studies on the mathematical model of the nine-switching converter, and the interaction between the generator-side converter and the grid-side converter is not considered, which limits the control performance of the system

Method used

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  • Nine-switch type double-fed fan system and control method
  • Nine-switch type double-fed fan system and control method
  • Nine-switch type double-fed fan system and control method

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Embodiment Construction

[0083] The present invention will be further explained below in conjunction with the drawings:

[0084] A mathematical model and control method of a PIR current controlled nine-switch double-fed fan system includes the following steps:

[0085] Step 1: Establish a mathematical model of the nine-switch converter; figure 1 Shown is the structure diagram of the mathematical model of the nine-switch double-fed fan system, which is represented by figure 1 It can be seen that the nine-switch converter contains nine IGBT switching devices, and the state of each switching device is defined as follows:

[0086]

[0087] In the formula, X=A, B, C; I=H, M, L. Among them, XI respectively represent nine switching devices.

[0088] Each bridge arm of the nine-switch converter has 8 switching states. Because the output port cannot float, the DC bus cannot be short-circuited, etc., each branch has only 3 effective switching states. These three valid states satisfy the following constraints:

[0089...

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Abstract

The invention provides a nine-switch type double-fed fan system and a control method. The system comprises a nine-switch converter, a doubly-fed fan and a control circuit. The control method comprisesthe steps that first, a switching function model of the nine-switch converter is established; secondly, the mapping relationship between the load parameters of the nine-switch converter and the parameters of the doubly-fed fan system in a dq coordinate system is given; and finally, a ratio integral resonant controller is applied to a grid-side converter and a machine-side converter. The nine-switch type double-fed fan system and the control method, which are provided by the invention, the mapping relationship solves the problem that the control performance of the system is limited by the interaction between the machine-side converter and the grid-side converter of the doubly-fed fan; the design of the system control strategy is effectively simplified; the harmonic current content and theovershoot of the system are effectively reduced; and the dynamic response speed of the system is improved.

Description

Technical field [0001] The invention relates to a double-fed fan system, in particular to a nine-switch type double-fed fan system and a control method. Background technique [0002] Doubly fed induction generator (Doubly fed Induction Generator) has been widely used in wind power systems due to its small capacity, low price, and low harmonics of excitation converters. It consists of a generator with a stator winding directly connected to a fixed frequency three-phase grid and a bidirectional back-to-back IGBT converter mounted on the rotor winding. [0003] In back-to-back converters, in order to protect the converter and successfully realize low voltage ride-through (LVRT), iron rods or magnetizing inrush current absorption active circuits are used, but the cost, volume and complexity of the system are increased. Recently, nine-switch converters have been developed and initially used to replace back-to-back converters in doubly-fed wind turbine systems. Compared with back-to-ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCY02E10/76
Inventor 潘雷徐东兴张静梅庞毅王凯殷畅张树臣
Owner TIANJIN CHENGJIAN UNIV
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