Parallel structure of three-phase multilevel pwm converter

A converter, multi-level technology, applied in the direction of converting AC power input to DC power output, irreversible AC power input converting to DC power output, electrical components, etc., to solve the problem of current sharing and avoid circulating current.

Inactive Publication Date: 2011-12-21
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a three-phase multi-voltage converter that can solve the problem of consistency of energy flow in parallel mul

Method used

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  • Parallel structure of three-phase multilevel pwm converter
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  • Parallel structure of three-phase multilevel pwm converter

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Example Embodiment

[0022] This embodiment is a parallel structure of a three-phase multi-level PWM converter (three-phase three-level PWM converter) (see Figure 1-4 ).

[0023] Such as figure 1 As shown, this embodiment includes more than two three-phase multilevel PWM converters and their control circuit units and digital signal processors; also includes a common unified voltage regulator; each of the three-phase multilevel PWM converters The input ends of the converter and its control circuit unit are connected in parallel and then connected to the same three-phase AC power circuit, and the output ends are connected in parallel and then connected to the same load R L The unified voltage regulator is composed of a voltage sampling circuit 1, a voltage sensor 2, a third adder 3, and an outer loop voltage PI regulator 4; the voltage sampling circuit 1 and the load R L In parallel, the output terminal of the voltage sampling circuit 1 is connected to the input terminal of the outer loop voltage PI re...

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Abstract

The present invention relates to a parallel structure of three-phase multi-level PWM converters which are suitable for distributed power supplies, and systems for grid-connected power generation with renewable energies, charging and discharging and energy storage therefor and the like. Then present invention includes more than two three-phase multi-level PWM converters and control circuit units thereof, a digital signal processor and a three-phase alternating current power supply circuit; and further includes a common unified voltage regulator, the unified voltage regulator consisting of a voltage sampling circuit, a voltage sensor, a third adder and an external loop voltage PI regulator, the voltage sampling circuit being connected in parallel to a load RL. The advantages of the present invention are as follows: the energy flow direction consistency problem of each three-phase multi-level PWM converter when operating in parallel is solved, the generation of a loop current is avoided, and at the same time the problem of equal current when each three-phase multi-level PWM converter operates in parallel is solved. The present invention is suitable for scenarios in which high power and scaled power electronics conversion is applied.

Description

technical field [0001] The invention relates to a parallel structure of a three-phase multi-level PWM converter, which is suitable for systems such as distributed power supply, grid connection of renewable energy generation, charging and discharging, and energy storage. Background technique [0002] In recent years, power electronics technology has developed continuously and has been widely used in various fields that require electric energy conversion. In the field of low-voltage and low-power electricity consumption, power electronics technology is becoming mature, while in the field of high-voltage and high-power applications, multi-level power conversion technology has gradually become the core and hot issue of research. [0003] Multi-level conversion technology is a new type of converter that realizes high-voltage and high-power output by improving the converter's own topology. It does not require step-up transformers and voltage equalization and transformation circuit...

Claims

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Application Information

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IPC IPC(8): H02M7/23
CPCH02M7/487H02M7/23
Inventor 岳啸鸣范辉潘瑾李铁成颜湘武张波董清谷建成杨润武
Owner STATE GRID HEBEI ELECTRIC POWER RES INST
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