ANPC type three-level inverter and modulation method thereof

A technology of three-level inverter and modulation method, which is applied in the direction of electrical components, AC power input conversion to DC power output, output power conversion device, etc., and can solve problems such as overvoltage damage of switching tubes

Active Publication Date: 2019-02-12
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But in fact, due to the differences in the switching tube drive circuit and the semiconductor device itself, each switching tube cannot strictly follow the figure 2 The on / off switching is completed at the time specified in the above, and at this time, the problem of overvoltage damage to the switch tube will inevitably occur.

Method used

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  • ANPC type three-level inverter and modulation method thereof
  • ANPC type three-level inverter and modulation method thereof
  • ANPC type three-level inverter and modulation method thereof

Examples

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example 1

[0087] exist Figure 5a based on the obtained image 3 The enlarged waveform of the modulation method shown in the positive half cycle is shown in Fig. 7a, Figure 7a Among them, the starting time of deadtime1 is set to delay deadtime11, and the starting time of deadtime2 is set to remain unchanged. At this time, the driving waveforms of switching tubes T1, T5, and T6 are respectively shown in Figure 7a T1_dd, T5_dd, T6_dd in. exist Figure 5b On the basis of the obtained modulation method shown in Figure 4, the enlarged waveform of the positive half cycle is as follows Figure 7b as shown, Figure 7b In , the starting time of Deadtime3 is set to be delayed by deadtime33, and the starting time of deadtime4 is set to remain unchanged. At this time, the driving waveforms of switching tubes T4, T6, and T5 are respectively shown in Figure 7b T4_dd, T6_dd, T5_dd in.

[0088] That is, Figure 7a Compared to Figure 4a All the improvements are as follows: during the process...

example 2

[0090] exist Figure 5a based on the obtained image 3 The enlarged waveform of the modulation method shown in the positive half cycle is shown in Fig. 8a, Figure 8a, the starting time of deadtime1 and deadtime2 is set to remain unchanged, at this time, the driving waveforms of switching tubes T1, T5, T6 refer to Figure 8a T1_dd, T5_dd, T6_dd in. On the basis of Figure 5b, the enlarged waveform of the modulation method shown in Figure 4 in the positive half cycle is shown as Figure 8b as shown, Figure 8b In , the starting time of Deadtime3 and deadtime4 is set to remain unchanged, at this time, the driving waveforms of switching tubes T4, T6, T5 are respectively referred to Figure 7b T4_dd, T6_dd, T5_dd in.

[0091] That is to say, Figure 8a Compared to Figure 4a All the improvements are as follows: during the process of switching from 0 level to 1 / 2Vbus level, T1 delays the opening of deadtime1 time, T5 turns off on time, and T6 turns on in advance of deadtime11...

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Abstract

The invention discloses an ANPC type three-level inverter and a modulation method thereof to avoid over-voltage damage of a switch tube. The modulation method comprises the steps of keeping T2 normally switched on and T3 and T4 normally switched off in positive half-cycle, keeping T5 switched off in a process of switching 0 level into 1/2 Vbus level, switching on T1 after T5 is switched off, and switching on T6 before T5 is switched off; in a process of switching 1/2 Vbus level into 0 level, switching off T1, switching on T5 after T1 is switched off, and switching off T6 after T5 is switched on; in negative half-cycle, keeping T3 normally switched on and T1 and T2 normally switched off, in a process of switching 0 level into minus 1/2 Vbus level, switching off T6, switching on T4 after T6is switched off, and switching on T5 before T6 is switched off; and in a process of switching minus 1/2 Vbus level into 0 level, switching off T4, switching on T6 after T4 is switched off, and switching off T5 after T6 is switched on.

Description

technical field [0001] The invention relates to the technical field of power electronics, and more specifically, relates to an ANPC type three-level inverter and a modulation method thereof. Background technique [0002] The main circuit topology of the ANPC (Active Neutral-point-c lamped) type three-level inverter is as follows: figure 1 As shown, it includes 6 switching tubes T1~T6 and 6 diodes D1~D6, wherein: each switching tube is connected with a diode in antiparallel, the first terminal of T1 is connected to the positive pole of the busbar, the second terminal of T4 is connected to the negative pole of the busbar, T1 The second terminal of T2 is connected to the first terminal of T5, the first terminal of T4 is connected to the second terminal of T3 and T6, the second terminal of T5 and the first terminal of T6 are connected to the midpoint of the busbar, and the second terminal of T2 , and the first ends of T3 are connected together to form the bridge arm end O. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/487H02M1/38
CPCH02M1/38H02M7/487H02M1/385
Inventor 文鹏王鹏陈鹏耿后来曹金虎张兵别伟程林
Owner SUNGROW POWER SUPPLY CO LTD
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