Modular multilevel converter (MMC)-based transformer-free four-quadrant high-voltage variable frequency power supply topological structure

A high-voltage variable frequency power supply and topology technology, which is applied in the direction of converting irreversible DC power input into AC power output, electrical components, and output power conversion devices.

Inactive Publication Date: 2011-05-11
RONGXIN POWER ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect that this new technology has been found by researchers at home or abroad can be improved efficiency when working on certain types of tasks compared to previous methods.

Problems solved by technology

High-Voltage Frequency Translation Power Supply: Current methods use expensive components such as inductors or capacitors that require extra space on both sides of the circuit board. There currently exist solutions involving multiple isolated phases shifters connected by wires between them. However these techniques result in increased energy usage due to their complexity and size, leading to reduced efficiency and potential damage from electrical arcs caused during startup.

Method used

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  • Modular multilevel converter (MMC)-based transformer-free four-quadrant high-voltage variable frequency power supply topological structure
  • Modular multilevel converter (MMC)-based transformer-free four-quadrant high-voltage variable frequency power supply topological structure
  • Modular multilevel converter (MMC)-based transformer-free four-quadrant high-voltage variable frequency power supply topological structure

Examples

Experimental program
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Effect test

Embodiment 1

[0028] See figure 2 , image 3 , based on MMC transformer-less four-quadrant high-voltage variable-frequency power supply topology, the rectifier module and the inverter module adopt the same subunit structure, which is composed of multiple subunits connected in series. connected. The charging circuit is connected to the rectification module, the rectification module converts the high-voltage AC voltage into DC, and the inverter module converts the DC into AC to realize the simulation of various states of the power grid.

[0029] Both the rectifier module and the inverter module are three-phase, and each phase is composed of an even number of n subunits in series, which are divided into two groups, the number of subunits in each group is n / 2; the output terminals of the inverter module are two groups The midpoint of the subunit, and the output terminal is connected to each group of subunits with a coupling or non-coupling buffer inductor L; the input terminal of the rectifi...

Embodiment 2

[0038] See Figure 4 , Figure 5 , based on MMC transformer-less four-quadrant high-voltage variable-frequency power supply topology, both the rectifier module and the inverter module adopt a modular multi-level structure, which is composed of multiple sub-units connected in series. side high voltage connection. This structure can realize the direct input of high-voltage power supply without transformer, the rectifier module directly converts high-voltage AC voltage into DC, and the inverter module converts DC into AC; it realizes the simulation of various states of the power grid. The topology is a four-quadrant type, which can Realize energy feedback.

[0039] See Figure 4 , the rectifier module and the inverter module are three-phase, and each phase is composed of n subunits in series, the input terminal of the rectifier module of the three-phase series subunit is connected to the charging circuit, and the output of the inverter module of the three-phase series subunit ...

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Abstract

The invention relates to a modular multilevel converter (MMC)-based transformer-free four-quadrant high-voltage variable frequency power supply topological structure. A rectifier module and an inverter module have a modular multilevel structure and are formed by a plurality of subunits connected in series. The input side of the topological rectifier module is directly connected with a network-side high voltage through a charging circuit; the rectifier module converts a high-voltage alternating current (AC) voltage into a direct current (DC) voltage and inputs the DC voltage into the inverter module, and the inverter module converts the DC voltage into the AC voltage; and various states of a power system are simulated, and the topological structure has a four-quadrant type and can feed energy back. The topological structure has the advantages of removing the high-voltage transformer at the power input end, lowering cost, reducing volume and weight of a high-voltage variable frequency power supply, reducing consumption of components, and improving work efficiency, has a simple unit structure, and is convenient to wire and easy to disassemble and assemble.

Description

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Claims

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Application Information

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Owner RONGXIN POWER ELECTRONICS
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