Dual-three-level online-topology switchable inverter

A three-level inverter, switching technology, applied in the direction of converting irreversible DC power input to AC power output, electrical components, output power conversion devices, etc., can solve the problem of large switching loss and complex inverter structure , Low working efficiency of the inverter, etc., to achieve the effect of reduced switching loss, simple structure, and reduced harmonic distortion rate

Inactive Publication Date: 2014-01-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is to solve the problems of complex structure and large switching loss of existing inverters, which lead to low working efficiency of the inverter, and now provides a dual-three-level online topology switchable inverter

Method used

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  • Dual-three-level online-topology switchable inverter
  • Dual-three-level online-topology switchable inverter
  • Dual-three-level online-topology switchable inverter

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specific Embodiment approach 1

[0020] Specific implementation mode one: refer to figure 1 Specifically explaining this embodiment, the dual three-level online topology switchable inverter described in this embodiment includes: a first three-level inverter, a second three-level inverter and a bidirectional switch 3;

[0021] The first three-level inverter includes: a first DC power supply 11, a first DC capacitor 12, a second DC capacitor 13, a first auxiliary switch 14, a first power switch 15, a second power switch 16, a first Three power switches 17 and a fourth power switch 18;

[0022] The positive pole of the first DC power supply 11 is simultaneously connected with one end of the first DC capacitor 12, the power input terminal of the first power switch 15 and the power input terminal of the third power switch 17, and the negative pole of the first DC power supply 11 is connected with the second DC power supply simultaneously. One end of the DC capacitor 13, the power output end of the second power sw...

specific Embodiment approach 2

[0026] Specific implementation mode two: refer to figure 2 Describe this embodiment in detail. This embodiment is a further description of the dual-three-level on-line topology switchable inverter described in Embodiment 1. In this embodiment, the bidirectional switch 3 includes: a first two-pole Tube 31, second diode 32, third diode 33, fourth diode 34 and power switch 35;

[0027] The output end of the first diode 31 and the output end of the third diode 33 are connected to the power input end of the power switch 35 at the same time, and the power output end of the power switch 35 is connected to the input end of the second diode 32 and the fourth diode 32 at the same time. The input end of the diode 34, the output end of the second diode 32 is connected to the input end of the first diode 31, and the output end of the fourth diode 34 is connected to the input end of the third diode 33;

[0028] The output terminal of the second diode 32 serves as the power output terminal...

specific Embodiment approach 3

[0029]Specific Embodiment 3: This embodiment is a further description of the dual-three-level on-line topology switchable inverter described in Specific Embodiment 1 or 2. In this embodiment, the first DC power supply 11 and the second DC The power supplies 21 have the same output voltage level and power level.

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Abstract

The invention discloses a dual-three-level online-topology switchable inverter, belongs to the field of electrical energy conversion and aims to solve the problem of low working efficiency of existing inverters because of complex structures and large switching loss. According to the dual-three-level online-topology switchable inverter, two three-level inverter bodies provided with auxiliary switches are connected in series and connected with each other through a bilateral switch, when an input voltage of a direct current power supply is changed, the inverter can be switched between a five-level cascaded inverter mode and a three-level inverter mode through the bilateral switch, and the number of power switch devices is reduced, so that the structure of a system is simple, the switching loss of the system is reduced by 20%, the working efficiency of the inverter is further improved by 15%, and meanwhile, the harmonic distortion rate of an output voltage is reduced by 5%. The dual-three-level online-topology switchable inverter is used for converting direct current voltages into alternating current voltages, so that the working efficiency of the inverter is improved, and the working range of the inverter is widened.

Description

technical field [0001] The invention belongs to the field of electric energy conversion. Background technique [0002] Issues such as energy shortage and deteriorating environment in today's world have been widely concerned. The photovoltaic power generation technology with clean and zero-pollution characteristics provides a new development direction for solving energy problems. Since photovoltaic power generation is affected by sunlight, its output voltage presents a characteristic of large fluctuations, so it is difficult to be directly applied to grid-connected power generation or constant voltage AC power supply and other fields. In order to solve the above problems, DC-DC-AC-based two-stage conversion structure, single-stage Z-source inverter structure and multi-level power conversion structure are all applied in photovoltaic power generation systems. The two-stage structure of DC-DC-AC is mainly composed of photovoltaic cells, DC-DC converter and DC-AC inverter. Amo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02M7/49H02M7/5387H02M1/12
Inventor 骆素华吴凤江骆林松冯帆张陆捷
Owner HARBIN INST OF TECH
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