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A buck-boost inverter and its control method

A technology of inverter and buck-boost, which is applied in the field of buck-boost inverter and its control, which can solve the problems of reducing system safety and efficiency, and achieve the goal of improving waveform quality, reducing circuit cost, and reducing the number of components Effect

Active Publication Date: 2022-02-08
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inverter proposed in the above patent still has leakage current in the circuit, which reduces the safety and efficiency of the system.

Method used

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  • A buck-boost inverter and its control method
  • A buck-boost inverter and its control method
  • A buck-boost inverter and its control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] like figure 1 As shown, this embodiment proposes a buck-boost inverter, including a first filter inductor L 1 , the second filter inductance L 2 , the third filter inductance L 3 , the fourth filter inductor L 4 , the first switch tube S 1 , the second switch tube S 2 , the third switch tube S 3 , the fourth switch tube S 4 , the fifth switch tube S 5 , the sixth switch tube S 6 , the first filter capacitor C 1 , the second filter capacitor C 2 , the first diode D 1 , the second diode D 2 , the third diode D 3 ;in,

[0049] The second switch tube S 2 The first end and the input power U in One end and the first switch tube S 1 The first end is connected, the second switching tube S 2 The second terminal and the second diode D 2 Cathode and second filter inductor L 2 One end connection;

[0050] second diode D 2 Anode and the third switch tube S 3 the second end connection;

[0051] The third switch tube S 3 The first end and the input power U in ...

Embodiment 2

[0062] On the basis of the buck-boost inverter described in Embodiment 1, this embodiment provides a control method for the buck-boost inverter:

[0063] When input power U in >Output side voltage u g , output side voltage u g In the positive half cycle, the first switching tube S 1 , the fourth switch tube S 4 , the sixth switch tube S 6 Normally off, the third switch tube S 3 , the fifth switch tube S 5 Normally open, the second switch tube S 2 switching high frequency, such as figure 2 and image 3 shown. It can be adjusted by adjusting the second switch tube S 2 The duty cycle to adjust the grid current i g The size of the guarantee grid current i g and grid voltage u g Same frequency and same phase.

[0064] When input power U in >Output side voltage u g , output side voltage u g In the negative half cycle, the second switching tube S 2 , the third switch tube S 3 , the fourth switch tube S 4 , the fifth switch tube S 5 Normally off, the sixth switch...

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PUM

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Abstract

The invention provides a buck-boost inverter and a control method thereof, belonging to the technical field of power conversion. including input power U in , the first to sixth switching tubes S 1 ~S 6 , the first and second filter capacitors C 1 、C 2 , the first to fourth filter inductance L 1 ~ L 4 , the first to third diodes D 1 ~D 3 ;S 2 The first end and U in , S 1 The first end is connected, the second end is connected with D 2 Cathode and L 2 connection; D 2 Anode and S 3 Second end connection; S 3 The first end and U in the other end, C 1 , L 1 , S 4 second end, C 2 Connected to the output side; L 2 the other end with S 4 first end, D 3 Anode connection; D 3 Cathode and C 2 the other end, S 5 First end connection; S 5 The second end and L 4 connection; L 4 the other end with L 3 and S 6 First end connection, L 3 The other end is connected to the other end of the output side; S 6 second terminal C 1 the other end and D 1 Anode connection; D 1 Cathode and L 1 the other end and S 1 The second end is connected. The ground supply of the input side and the output side of the invention eliminates the leakage current and overcomes the straight-through problem of the traditional bridge inverter.

Description

technical field [0001] The present invention relates to the technical field of power conversion, and more specifically, to a buck-boost inverter and a control method thereof. Background technique [0002] With the increasing environmental pollution and the continuous shortage of fossil energy, new energy power generation technologies such as solar energy, wind energy, and fuel cell power generation have attracted people's attention due to their advantages such as pollution-free and renewable. However, photovoltaic power generation, wind energy and fuel cell power generation output electric energy as direct current, while grid voltage is alternating current. Therefore, the grid-connected inverter is a key interface circuit between new energy generation technology and the grid. Since photovoltaic power generation and fuel cells are easily disturbed by the external environment, the output voltage varies in a wide range, which leads to the output voltage being sometimes higher ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48
CPCH02M7/48Y02B70/10
Inventor 胡雪峰龙子康江顺德沈浩张玉勃姚志垒杨云虎郑诗程
Owner ANHUI UNIVERSITY OF TECHNOLOGY