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Double-fed frequency converter and modulation method thereof

A modulation method and frequency converter technology, which are applied in the direction of converting AC power input to DC power output, high-efficiency power electronic conversion, and output power conversion devices, to achieve voltage stress and heat distribution solutions, good voltage equalization effect, and uniform heat distribution. Effect

Active Publication Date: 2021-01-08
YUANJIAN WIND POWER JIANGYINENVISION ENERGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a doubly-fed frequency converter and its modulation method, so as to solve the problem of failure risk in the existing doubly-fed frequency converter under synchronous speed operation

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  • Double-fed frequency converter and modulation method thereof
  • Double-fed frequency converter and modulation method thereof
  • Double-fed frequency converter and modulation method thereof

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Embodiment Construction

[0069] The doubly-fed frequency converter and its modulation method proposed by the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become apparent from the following description and claims. It should be noted that, the accompanying drawings are all in a very simplified form and in inaccurate scales, and are only used to facilitate and clearly assist the purpose of explaining the embodiments of the present invention.

[0070] Furthermore, unless stated otherwise, features in different embodiments of the invention may be combined with each other. For example, a certain feature in the second embodiment can be used to replace the corresponding or functionally identical or similar feature in the first embodiment, and the resulting embodiment also falls within the scope of disclosure or description of the present application.

[0071] The core...

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Abstract

The invention provides a doubly-fed frequency converter and a modulation method thereof, the doubly-fed frequency converter comprises a three-phase bridge arm and a control unit, and each phase bridgearm comprises a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module and a sixth switch module. The control unit controls the on and off of the first switch module, the second switch module, the third switch module, the fourth switch module, the fifth switch module and the sixth switch module, thereby enabling each phase of bridge arm to enter a positive half-wave period state, a positive dead zone state, a positive zero state, an all-zero state, a negative zero state, a negative dead zone state and a negative half-wave period state.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a doubly-fed frequency converter and a modulation method thereof. Background technique [0002] Doubly-fed generator (DFIG), both the stator and rotor can feed power to the grid, the rotor side adopts slip control, and the excitation frequency changes with the motor speed. The doubly-fed frequency converter is used for the AC grid to provide excitation current to the generator, to control the torque of the generator, and to realize the generator feeding power to the grid. [0003] At present, similar products on the market mainly use two-level inverters or I-type NPC three-level inverters. For the special application scenario of synchronous speed operation of double-fed inverters, the excitation current provided by the inverter is DC, which will cause the current to flow through the inverter for a long time. Some power semiconductor devices specific to the generator ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02M7/5387
CPCH02M7/483H02M7/53871H02M1/0054Y02B70/10H02M7/487H02M1/32
Inventor 孟浩胡子晨曹亮
Owner YUANJIAN WIND POWER JIANGYINENVISION ENERGY CO LTD
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