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Medium and high voltage power conversion method and device

A power conversion, medium and high voltage technology, applied in circuit devices, output power conversion devices, and conversion equipment for intermediate conversion to DC conversion, etc., to reduce volume and cost, increase switching frequency, and achieve the effect of bidirectional power flow

Inactive Publication Date: 2003-04-16
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the volume and environmental protection problems under this structure are more prominent

Method used

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  • Medium and high voltage power conversion method and device
  • Medium and high voltage power conversion method and device
  • Medium and high voltage power conversion method and device

Examples

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Effect test

example 1

[0031] Example 1: 2500kW, 10kV high-power high-voltage inverter

[0032] The input requires 15-level power conversion modules to be connected in series, and each module consists of four 1200V / 400A two-unit IGBT modules and two dc-link capacitors connected in series. Through the input stage, the AC input is modulated into a high-frequency signal of 5-10kHz, coupled to the output stage through a high-frequency transformer with a transformation ratio of 1:1.1, and then transformed into an AC output of the required frequency and amplitude by the output stage module. The output stage is also composed of 15 modules connected in series with the same modules as the input stage. Because the structure is single-phase, it is necessary to use three sets of converters of this structure to connect into Y-type or D-type to complete the conversion of three-phase alternating current.

[0033] The 10kV AC input is loaded on 15 AC-DC-AC power conversion modules connected in series to realize vo...

example 2

[0034] Example 2: 2000kVA, 35kV / 10kV transformer

[0035] The input stage requires 15 power conversion modules to be connected in series, and each module consists of four 3300V / 100A two-unit IGBT modules and two dc-link capacitors connected in series. Through the input stage, the AC input is modulated into a high-frequency signal of 5-10kHz, coupled to the output stage through a high-frequency transformer, and then transformed into an AC output of the required frequency and amplitude by the output stage module. The output stage is also composed of 15 power conversion modules connected in series, and each module consists of four 1200V / 400A two-unit IGBT modules and two dc-link capacitors connected in series. Because the structure is single-phase, it is necessary to use three sets of converters of this structure to connect into Y-type or D-type to complete the conversion of three-phase alternating current.

[0036] The 35kV AC input is loaded on 15 AC-DC-AC power conversion mod...

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Abstract

A method for converting medium and high voltage is as follows: 1. turn the input medium and high AC voltage to N channels of AC circuit 2. turn NAC channels to high frequency AC circuit 3. process every channel of high-frequency AC circuit for step transform by high frequency transformer then to be overlapped after rectification-inversion transformation to output the AC circuit with required frequency and amplitude. The device includes symmetrical same input and output transformation step (formed by N step same power serial transforming modules) and middle isolated transforming step made up of N high-frequency transformers and the outputs of which are coupled to output transforming step by high-frequency transformer.

Description

technical field [0001] The present invention relates to a power system electric energy conversion technology, more specifically to a medium and high voltage power conversion method and device. Background technique [0002] Power conversion technology plays a very important role in the transmission and distribution network of the power system. With the rapid development of power electronic technology, it is becoming more and more common to use power electronic devices and converter technology to realize energy conversion in power systems. However, limited by the withstand voltage level and capacity of the device itself, the application of power electronic conversion technology in medium and high voltage power systems is very limited. Although the research of high-voltage and high-power power electronic devices has made great progress in recent years, their withstand voltage level and capacity are still very limited compared with medium and high-voltage power systems, and can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02M5/00H02M5/40
Inventor 毛承雄王丹陆继明范澍
Owner HUAZHONG UNIV OF SCI & TECH
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