A six-level circuit topology for power conversion systems

A circuit topology and power conversion technology, applied in high-efficiency power electronic conversion, conversion of AC power input to DC power output, electrical components, etc. question

Active Publication Date: 2019-07-19
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the current six-level research that has been proposed, there are still problems such as large switching loss, complex switching of mode switching states, and difficulty in eliminating the dead zone effect.

Method used

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  • A six-level circuit topology for power conversion systems
  • A six-level circuit topology for power conversion systems
  • A six-level circuit topology for power conversion systems

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] Such as figure 1 As shown, the present invention is a six-level circuit topology for power conversion systems, including twelve switching devices A1-A12, five bus capacitors C 1 ~C 5 and three clamping capacitors C A1 ~C A3 .

[0093] The six-level circuit topology includes a first bus capacitor C 1 ~ Fifth bus capacitor C 5 The left path composed of series in the same direction in turn,

[0094] The right path composed of the first switching device A1 to the sixth switching device A6 connected in series in sequence,

[0095] Middle Road 1 composed of the ninth switching device A9,

[0096] The second middle circuit composed of the seventh switching device A7 and the tenth switching device A10 connected in series,

[0097] The middle circuit three composed of the eighth switching device A8 and the eleventh switching device A11 connected in series,

[0098] A middle circuit four composed of the twelfth switching device A12.

[0099] In said right path:

[0100...

Embodiment 2

[0119] The present invention is a six-level circuit topology for power conversion systems, such as figure 2 As shown, including eighteen switching tubes S A1 ~S A6 , S A7 1 ~S A7 2 , S A8 1 ~S A8 2 , S A9 1 ~S A9 2 , S A10 1 ~S A10 2 , S A11 1 ~S A11 2 , S A12 1 ~S A12 2 , five bus capacitors C 1 ~C 5 and three clamping capacitors C A1 ~C A3 .

[0120] Among the eighteen switching tubes, four switching tubes are connected to form a first T-shaped unit, four switching tubes are connected to form a second T-shaped unit, and ten switching tubes are connected to form a π-shaped unit.

[0121] After the first to fifth bus capacitors are sequentially connected in series in the same direction, they are connected in parallel to the DC bus as a whole. A clamp capacitor is provided between the T-shaped unit and the π-shaped structural unit, and the T-shaped unit and the π-shaped structural unit are connected in parallel to the DC bus as a whole.

[0122] ...

Embodiment 3

[0143] according to figure 2 A single-phase six-level inverter of the topology shown, including five bus capacitors C 1 ~C 5 , eighteen switching tubes S A1 ~S A6 , S A7 1 ~S A7 2 , S A8 1 ~S A8 2 , S A9 1 ~S A9 2 , S A10 1 ~S A10 2 , S A11 1 ~S A11 2 , S A121 ~S A12 2 , three clamping capacitors C A1 、C A2 、C A3 .

[0144] Among them, the first to fifth bus capacitors C 1 ~C 5 are the five capacitors on the DC bus, which are respectively one-fifth of the bus voltage, and the switching tube S of the whole system A1 ~S A6 , S A7 1 ~S A7 2 , S A8 1 ~S A8 2 , S A9 1 ~S A9 2 , S A10 1 ~S A10 2 , S A11 1 ~S A11 2 , S A12 1 ~S A12 2 Both anti-parallel diodes.

[0145] 12 switching tubes S A7 1 ~S A7 2 , S A8 1 ~S A8 2 , S A9 1 ~S A9 2 , S A10 1 ~S A10 2 , S A11 1 ~S A11 2 , S A12 1 ~S A12 2 Six pairs of switching tube groups composed of two pairs. The turn-on and turn-off signals given by each switch ...

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Abstract

The invention relates to a six-level circuit topology structure for a power conversion system. The circuit includes a left circuit composed of first to fifth bus capacitors connected in series in the same direction, and a first switching device A1 and a second switching device. A2, the third switching device A3, the fourth switching device A4, the fifth switching device A5, and the sixth switching device A6 are connected in series in sequence to form the right circuit, the middle circuit one is composed of the ninth switching device A9, and the seventh switching device A7 The middle circuit 2 composed of the tenth switching device A10 in series, the middle circuit 3 composed of the eighth switching device A8 and the eleventh switching device A11 in series, the middle circuit 4 composed of the twelfth switching device A12, and three clamping capacitors . The invention can effectively reduce the switching loss, reduce the harmonics of the voltage in the circuit, can also flexibly control the switching tube, and can be applied to power conversion devices such as inverters.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a six-level circuit topology used in a power conversion system. Background technique [0002] With the development of high-power power conversion, more and more occasions pay more attention to the application of multi-level circuit structure with high level and low harmonics. Multi-level high-power power conversion system can be used for wind power generation, photovoltaic inverter and other fields. However, in high-power applications, how to reduce loss, improve efficiency, and reduce output waveform harmonics are issues that system designers need to consider. [0003] The development and application of multi-level technology can effectively reduce the harmonics of the output terminal voltage, making the output sinusoidal voltage waveform smoother. In multi-level circuits, the withstand voltage requirements of power switch tubes are reduced, which is of positive sign...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02M1/12
CPCH02M1/12H02M7/483H02M1/0054Y02B70/10
Inventor 宋崇辉宋家祥韩涛刁乃哲孙先瑞王堃马羽
Owner NORTHEASTERN UNIV LIAONING
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