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anpc type three-level inverter and its modulation method
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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: 2020-07-07
SUNGROW POWER SUPPLY CO LTD
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[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.
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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 Figure 7a as shown, 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 Among them, the starting time of Deadtime3 is set to delay 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 referred to Figure 7b T4_dd, T6_dd, T5_dd in.
[0088] That is to say, Figure 7a Compared to Figure 4a All the improvements are as follo...
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 Figure 8a as shown, 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. 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 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, and T5 are respectively shown in 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 tur...
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Abstract
The application discloses an ANPC type three-level inverter and a modulation method thereof, so as to avoid overvoltage damage of a switching tube. The modulation method includes: in the positive half cycle, keep T2 normally on, T3 and T4 normally off, during the process of cutting 0 level to 1 / 2Vbus level, T5 is turned off, T1 is turned on after T5 is turned off, and T6 is turned off after T5 In the process of 1 / 2Vbus level cut to 0 level, T1 is turned off, T5 is turned on after T1 is turned off, T6 is turned off after T5 is turned on; in the negative half cycle, keep T3 normally on, T1 and T2 Normally off, during 0-level cut-1 / 2Vbus level, T6 is turned off, T4 is turned on after T6 is turned off, and T5 is turned on before T6 is turned off; ‑1 / 2Vbus level is switched to 0-level process , T4 is turned off, T6 is turned on after T4 is turned off, and T5 is turned off after T6 is turned 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-clamped) 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. [0...
Claims
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