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Simplified efficient three-phase AC (alternating current)-DC (direct current)-AC converter adaptive to intermediate and small power occasions

A medium and small power, converter technology, applied in output power conversion devices, AC power input conversion to AC power output, reactive power adjustment/elimination/compensation, etc. Reduce energy loss, efficient conversion and transmission, and reduce the effect of reactive power and harmonics

Inactive Publication Date: 2012-02-15
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For low-voltage and medium-low power applications, this indirect AC-DC-AC converter composed of two back-to-back three-phase inverters has the disadvantages of many switching devices and large losses.

Method used

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  • Simplified efficient three-phase AC (alternating current)-DC (direct current)-AC converter adaptive to intermediate and small power occasions
  • Simplified efficient three-phase AC (alternating current)-DC (direct current)-AC converter adaptive to intermediate and small power occasions
  • Simplified efficient three-phase AC (alternating current)-DC (direct current)-AC converter adaptive to intermediate and small power occasions

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Embodiment Construction

[0017] see figure 1 , is an existing AC-DC-AC converter composed of two back-to-back three-phase inverters. The system consists of two three-phase six-switch inverters, a DC side capacitor and six output inductors. Two three-phase six-switch inverters form a back-to-back structure through the common DC side capacitors. Through the three-phase six-switch inverters, one side PWM rectification and one side PWM inverter functions can be realized, which can realize high power factor operation of the power grid, And can realize dynamic transfer of active energy, dynamic compensation of reactive power, negative sequence and harmonics. However, for small and medium power applications, the AC-DC-AC converter structure has the disadvantages of many power switching devices, large losses, and low efficiency.

[0018] see figure 2 , is a structural diagram of the present invention. For small and medium power AC-DC-AC converters, the present invention proposes a simplified three-phase ...

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Abstract

The invention discloses a simplified efficient three-phase AC (alternating current)-DC (direct current)-AC converter adaptive to intermediate and small power occasions, which comprises six output filtering inductors, two three-phase four-switch inverters and a DC side voltage-sharing circuit, wherein each three-phase four-switch inverter consists of two switch arms and a group of public DC side capacitors, and the two three-phase four-switch inverters constitute a back-to-back AC-DC-AC converter through the public DC side capacitors. Compared with the conventional AC-DC-AC converter consisting of two back-to-back type three-phase six-switch inverters, the three-phase AC-DC-AC converter disclosed by the invention reduces one pair of switch arms, the energy loss of switch components is reduced, and the cost can be greatly reduced.

Description

technical field [0001] The invention relates to a three-phase converter, in particular to a simplified high-efficiency three-phase AC-DC-AC converter suitable for medium and small power applications. Background technique [0002] Traditional AC voltage conversion adopts electromagnetic transformer technology. Low-frequency electromagnetic transformers are widely used in industrial and mining enterprises, scientific research institutes, and university laboratories. They realize AC / AC voltage transformation and electrical isolation and other functions, and have high power transfer efficiency. However, traditional electromagnetic transformers are bulky and bulky, have loud audio noise, no voltage stabilization function, and serious harmonic pollution to the power grid when supplying power to nonlinear loads (such as typical diode rectification and capacitor filter circuits), which cannot meet the miniaturization of electrical and electronic equipment. needs. [0003] With the ...

Claims

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Application Information

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IPC IPC(8): H02M5/458H02J3/18H02J3/01
CPCY02E40/30Y02E40/40
Inventor 罗安马伏军孙运宾谢宁何志兴
Owner HUNAN UNIV