[논문]An Improved SPWM Strategy to Reduce Switching in Cascaded Multilevel Inverters

Dong, Xiucheng; Yu, Xiaomei; Yuan, Zhiwen; Xia, Yankun; Li, Yu

doi:10.6113/jpe.2016.16.2.490

[해외논문] An Improved SPWM Strategy to Reduce Switching in Cascaded Multilevel Inverters 원문보기

Journal of power electronics, v.16 no.2, 2016년, pp.490 - 497

Dong, Xiucheng (School of Electrical Engineering and Electronic Information, Xihua University) , Yu, Xiaomei (School of Electrical Engineering and Electronic Information, Xihua University) , Yuan, Zhiwen (School of Electrical Engineering and Electronic Information, Xihua University) , Xia, Yankun (School of Electrical Engineering and Electronic Information, Xihua University) , Li, Yu (School of Electrical Engineering and Electronic Information, Xihua University)

Abstract ▼ AI-Helper

The analysis of the switch status of each unit module of a cascaded multi-level inverter reveals that the working condition of the switch of a chopper arm causes unnecessary switching under the conventional unipolar sinusoidal pulse width modulation (SPWM). With an increase in the number of cascaded multilevel inverters, the superposition of unnecessary switching gradually occurs. In this work, we propose an improved SPWM strategy to reduce switching in cascaded multilevel inverters. Specifically, we analyze the switch state of the switch tube of a chopper arm of an H-bridge unit. The redundant switch is then removed, thereby reducing the switching frequency. Unlike the conventional unipolar SPWM technique, the improved SPWM method greatly reduces switching without altering the output quality of inverters. The conventional unipolar SPWM technique and the proposed method are applied to a five-level inverter. Simulation results show the superiority of the proposed strategy. Finally, a prototype is built in the laboratory. Experimental results verify the correctness of the proposed modulation strategy.

주제어

AI 본문요약
AI-Helper

제안 방법

An improved SPWM strategy is proposed to reduce switching for a cascaded multi-level inverter and thereby address the problem of unnecessary switching under the conventional unipolar SPWM method. The proposed strategy mainly focuses on the switch states of a chopper arm at each cascaded unit and eliminates redundant switching. Moreover, the proposed method significantly reduces switching frequencies without altering the output performance of cascaded multi-level inverters.

대상 데이터

8, switching frequency is f = 3 kHz, load resistance is 100 Ω, and inductance is 10 mH. The DSP sampling data are imported into the Matlab workspace, and the experimental waveforms are obtained.
9). The setup mainly comprises two prototype platforms: a single-phase CHB with two cells and the control and drive platform. The TMS320F2812 DSP chip serves as the main chip.

데이터처리

To verify the effectiveness of the proposed method, simulations are performed by using Matlab/Simulink. The single-phase CHB, which comprises two cells and five output voltage levels, is built to compare the proposed method and the conventional unipolar SPWM.

성능/효과

As indicated in the comparison of Figs. 10 and 11, the THDs of the output voltage under the two modulation modes are 38.77% and 38.71%, which show good agreement with the theoretical analysis and simulation results. The experimental results show that the proposed method can reduce switching frequencies without altering the output performance.
Moreover, the proposed method significantly reduces switching frequencies without altering the output performance of cascaded multi-level inverters. As indicated by the simulation and experimental results, the proposed modulation decreases the switching frequency by approximately 49% in comparison with the value under the conventional unipolar SPWM. Therefore, the effectiveness of the proposed modulation strategy is verified.
71%, which show good agreement with the theoretical analysis and simulation results. The experimental results show that the proposed method can reduce switching frequencies without altering the output performance. The experimental results verify the validity of the proposed method.
As indicated by the simulation and experimental results, the proposed modulation decreases the switching frequency by approximately 49% in comparison with the value under the conventional unipolar SPWM. Therefore, the effectiveness of the proposed modulation strategy is verified.

후속연구

An improved SPWM strategy is proposed to reduce switching for a cascaded multi-level inverter and thereby address the problem of unnecessary switching under the conventional unipolar SPWM method. The proposed strategy mainly focuses on the switch states of a chopper arm at each cascaded unit and eliminates redundant switching.
The proposed strategy mainly focuses on the switch states of a chopper arm at each cascaded unit and eliminates redundant switching. Moreover, the proposed method significantly reduces switching frequencies without altering the output performance of cascaded multi-level inverters. As indicated by the simulation and experimental results, the proposed modulation decreases the switching frequency by approximately 49% in comparison with the value under the conventional unipolar SPWM.

참고문헌 (18)

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상세보기
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상세보기
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상세보기
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원문보기 상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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원문보기 상세보기
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상세보기
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상세보기
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상세보기

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연합인증

[해외논문] An Improved SPWM Strategy to Reduce Switching in Cascaded Multilevel Inverters 원문보기

Abstract ▼ AI-Helper

주제어

AI 본문요약
AI-Helper

제안 방법

대상 데이터

데이터처리

성능/효과

후속연구

참고문헌 (18)

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연합인증

[해외논문] An Improved SPWM Strategy to Reduce Switching in Cascaded Multilevel Inverters 원문보기

Abstract ▼ AI-Helper

주제어

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제안 방법

대상 데이터

데이터처리

성능/효과

후속연구

참고문헌 (18)

이 논문을 인용한 문헌

관련 콘텐츠

원문 보기

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