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Three-level circuit and control method thereof

A control method and three-level technology, applied in the field of converters, can solve the problems of high power density and unit power cost of converters, and achieve the effects of improving utilization, reducing junction temperature fluctuations, and prolonging service life

Pending Publication Date: 2022-01-28
SHENZHEN HOPEWIND ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method adapts to the requirement of junction temperature fluctuation by sacrificing the utilization rate of IGBT, and the power density and unit power cost of the converter are relatively high.

Method used

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  • Three-level circuit and control method thereof
  • Three-level circuit and control method thereof
  • Three-level circuit and control method thereof

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Embodiment Construction

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application clearer and clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

[0033] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right" etc. are based on The orientation or positional relationship shown in the drawings is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orienta...

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Abstract

The invention discloses a three-level circuit and a control method thereof. The three-level circuit comprises an active neutral point clamping three-level circuit composed of a first reverse conducting IGBT, a second reverse conducting IGBT, a third reverse conducting IGBT, a fourth reverse conducting IGBT and a sixth reverse conducting IGBT. The first reverse conducting IGBT and the fourth reverse conducting IGBT are outer tubes of the three-level circuit, the second reverse conducting IGBT and the third reverse conducting IGBT are inner tubes of the three-level circuit, and the fifth reverse conducting IGBT and the sixth reverse conducting IGBT are clamping tubes of the three-level circuit; and the method comprises the step of controlling the first to sixth reverse conducting IGBTs by adopting a unipolar and bipolar mixed wave generation mode so as to realize switching among a positive level state, a zero level state and a negative level state. According to the invention, the junction temperature fluctuation of the IGBT can be reduced, the service life of the IGBT is prolonged, and the utilization rate of the IGBT is improved.

Description

technical field [0001] The present application relates to the technical field of converters, in particular to a three-level circuit and a control method thereof. Background technique [0002] In the field of wind power converters, IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) is widely used, but since the machine side and grid side of the wind power converter are both inductive loads, in order to prevent overvoltage, IGBTs need to be connected in parallel A freewheeling diode provides a freewheeling circuit for the current, and the reverse conduction IGBT realizes the parallel connection of the freewheeling diode inside the IGBT. [0003] In recent years, three-level NPC converters have begun to develop rapidly. Three-level NPC converters can increase the system voltage level and are beneficial to harmonics and losses. The modulation strategy applied to the three-level NPC converter is generally a unipolar wave transmission method. Under this m...

Claims

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Application Information

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IPC IPC(8): H02M7/483H02M1/088
CPCH02M7/483H02M1/088
Inventor 许亚明王武华周党生贾宇
Owner SHENZHEN HOPEWIND ELECTRIC CO LTD