Method for realizing variable voltage level constant power output of converter

A technology of voltage level and implementation method, applied in the field of converters, can solve problems such as output power reduction

Inactive Publication Date: 2010-02-10
RONGXIN POWER ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, when the output voltage of the frequency conversion device is reduced, the output power is also proportionally reduced. In the case where constant power output of multiple voltage levels is ...

Method used

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  • Method for realizing variable voltage level constant power output of converter
  • Method for realizing variable voltage level constant power output of converter
  • Method for realizing variable voltage level constant power output of converter

Examples

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Embodiment 1

[0047] Embodiment 1: n=8, power is 5000kVA.

[0048] See Figure 8 , Full voltage level 13.2kV: Each phase is composed of 8 frequency conversion power units in series to form a converter chain, to achieve full voltage 13.2kV ​​three-phase AC constant power 5000kVA output.

[0049] See Figure 9 , 1 / 2 full voltage level 6.6kV: A converter chain is composed of 4 frequency conversion power units connected in series, and two converter chains are connected in parallel for each phase to achieve a 6.6kV three-phase AC constant power output of 5000kVA.

[0050] See Figure 10 , 1 / 4 full voltage level 3.3kV: A converter chain is composed of 2 frequency conversion power units in series, and each phase is connected in parallel by four converter chains to achieve a 3.3kV level three-phase AC constant power 5000kVA output.

[0051] See Figure 11 , 1 / 8 full voltage level 1.65kV: A converter chain is composed of 1 frequency conversion power unit, and each phase is connected in parallel ...

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Abstract

The invention relates to a method for realizing variable voltage level constant power output of a converter. The method realizes the series connection and parallel connection of variable flow chains consisting of a plurality of variable frequency power units in an A phase, a B phase and a C phase in a plurality of transformation modes of combining the series connection and the parallel connectionof a plurality of identical variable frequency power units and through the opening and closing control for a switch, and simultaneously controls the consistency of the current, the voltage amplitude,the frequency and the like output by each variable frequency power unit, thereby realizing the increase of the output current when the output voltage is decreased, and achieving the constant power output of a plurality of needed voltage levels, i.e. realizing variable multivoltage level constant power output on one converter. The converter is based on a multilevel H bridge series connection technology. The converter can be a four-quadrant converter or a two-quadrant converter or a one-quadrant converter and is depended on the circuit structures of the variable frequency power units, and a controllable rectifying device or an inverter of each variable frequency power unit can be an IGBT, an IGCT, an IEGT, or a PP IGBT.

Description

technical field [0001] The invention relates to a converter, in particular to a method for realizing a converter with variable voltage level and constant power output. Background technique [0002] With the development of power electronic devices, converters are widely used in the fields of telecommunications, energy, transportation, military equipment, material engineering, power systems and electrical transmissions to drive electrical transmission mechanisms or as variable frequency power supplies. At present, the relatively advanced high-voltage motor frequency conversion speed control device adopts IGBT power unit series (H bridge series) multi-level technology, digital control technology, and SPWM pulse width modulation technology, which has the characteristics of high efficiency, energy saving, high power factor and high reliability. It ends the energy and manpower waste caused by traditional methods, prolongs the service life of motors, fans, water pumps, etc., improv...

Claims

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Application Information

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IPC IPC(8): H02M1/00H02M7/02H02M5/02H02M5/40
Inventor 徐颖李兴张其生李旷丁雅丽郭自勇董力军
Owner RONGXIN POWER ELECTRONICS
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