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Medium and high voltage power conversion method and device

A power conversion, medium and high voltage technology, which is applied in circuit devices, output power conversion devices, and conversion equipment for intermediate conversion to DC conversion, etc., to achieve a wide range of applications, reduce volume and cost, and achieve the effect of bidirectional power flow

Inactive Publication Date: 2006-06-14
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

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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

[0033] Example 1: 2500kW, 10kV high-power high-voltage inverter

[0034] 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.

[0035] The 10kV AC input is loaded on 15 AC-DC-AC power conversion modules connected in series to realize vo...

example 2

[0036] Example 2: 2000kVA, 35kV / 10kV transformer

[0037] 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.

[0038]The 35kY AC input is loaded on 15 AC-DC-AC power conversion modu...

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Abstract

A medium and high voltage power conversion method is as follows: ① convert the input medium and high voltage AC into N channels of AC; ② convert N channels of AC into the same number of high frequency AC; Or step-down processing, and then superimposed after rectification-inverter circuit transformation, and output alternating current of required frequency and amplitude. The device includes a symmetrical and identical input conversion stage, an output conversion stage (all of which are connected in series with the same power conversion modules of N stages) and an intermediate isolation transformer stage composed of N high-frequency transformers. The output of each power conversion module Both are coupled to the output conversion stage via a high frequency transformer. The invention utilizes the potential superposition principle to realize the application of the low-voltage power electronic device in the medium-high voltage system. Through the intermediate AC-DC-AC conversion technology and the intermediate high-frequency transformer coupling, a static power conversion device is designed to convert the input AC into a voltage output with continuously adjustable amplitude and frequency. Realize forced voltage balance between devices and reduce harmonic components in the output waveform.

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