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(3N+3) switched cascaded based multi-port energy-feedback high-voltage converter and control method thereof

An energy-feedback, multi-port technology, applied in the control system, control/regulation system, AC motor control, etc., can solve unknown problems, reduce equipment volume, improve energy utilization efficiency, and reduce feedback grid pressure Effect

Inactive Publication Date: 2018-01-19
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using inductance or coupling single-phase transformers or delta / star connection three-phase transformers to realize the method of cascading the inverters of each unit to output high voltage, but it is still unknown whether the three methods are suitable for nine-switch units

Method used

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  • (3N+3) switched cascaded based multi-port energy-feedback high-voltage converter and control method thereof
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  • (3N+3) switched cascaded based multi-port energy-feedback high-voltage converter and control method thereof

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Embodiment Construction

[0037] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0038] The multi-port energy-feedback type high-voltage converter of the present invention is composed of basic units based on 3N+3 switching inverters cascaded. ", the "basic unit based on nine-switch inverter" is abbreviated as "nine-switch unit".

[0039] The following will take six 3N+3 switching units cascaded as an example to further illustrate the topology of the multi-port regenerative high-voltage converter of the present invention. See figure 1 , the 3N+3 switch unit is composed of a three-phase bridge PWM rectifier, a DC side capacitor and a 3N+3 switch inverter, and the 3N+3 switch inverter forms N groups of three-phase output ports. The three-phase bridge PWM rectifier is the front end of the 3N+3 switching unit, and the front end is...

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Abstract

The invention discloses a (3N+3) switched cascaded based multi-port energy-feedback high-voltage converter and a control method thereof. The multi-port energy-feedback high-voltage converter is formedby cascading a plurality of (3N+3) switch units, each (3N+3) switch unit comprises a three-phase bridge-type pulse width modulation (PWM) rectifier, a DC-side capacitor and a (3N+3) switch converter,N three-phase output ports are formed in the (3N+3) switch converter and are sequentially recorded as a port 1, a port 2 until a port N, the multi-port energy-feedback high-voltage converter is formed by cascading the plurality of (3N+3) switch units, the port 1 of the (3N+3) switch converter in each (3N+3) switch unit employs an inductance cascading mode, and the other ports of the (3N+3) switchconverter in each (3N+3) switch unit employ a three-phase transformer cascading mode. By the multi-port energy-feedback high-voltage converter, a plurality of load ports can be provided, regenerationenergy among a multi-port load can be directly utilized, the energy utilization efficiency is improved, the feedback power grid pressure is reduced, and meanwhile, the equipment volume also can be reduced.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a multi-port energy-feedback high-voltage converter based on 3N+3 switch cascading and a control method. Background technique [0002] With the decreasing energy reserves, the problem of utilizing the regenerative energy in the load of medium and high voltage large capacity motor groups has attracted much attention. For the recovery of regenerative energy, the PWM front-end is currently used to feed energy back to the grid or the energy storage device is used to recover energy, and the two forms of reuse are based on the transformation of the traditional H-bridge cascade structure. This type of topology can only drive one or more motors to run synchronously. Due to the three-phase multi-unit cascading, each unit is independent of direct pressure, which significantly increases the number of switches and reduces reliability. And both forms of energy utilizat...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02M7/797H02P27/08H02P5/74
Inventor 刘飞王盼查晓明宫金武庄一展陈超俞天毅
Owner WUHAN UNIV
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