An Optimized Third Harmonic Injection Method for Three-Phase Cascaded H-Bridge Photovoltaic Inverter

Wang Mao; Xing Zhang; Tao Zhao; Yuhua Hu; Fusheng Wang; Zhiqiang Dai; Renxian Cao

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자료유형: 학술대회자료

저자정보: Wang Mao (Hefei University of Technology) Xing Zhang (Hefei University of Technology) Tao Zhao (Hefei University of Technology) Yuhua Hu (Hefei University of Technology) Fusheng Wang (Hefei University of Technology) Zhiqiang Dai (Hefei University of Technology) Renxian Cao (Sungrow Power Supply)

저널정보: 전력전자학회 ICPE(ISPE)논문집 ICPE 2019-ECCE Asia

발행연도: 2019.5

수록면: 1,046 - 1,052 (7page)

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The uneven irradiation and temperature in photovoltaic (PV) modules of three-phase cascaded H-bridge (CHB) inverters will cause the unbalanced output power between solar panels, resulting in unbalanced grid current between three phases. In addition, since each phase can be regarded as a single-phase inverter, the second harmonic voltage pulsation of dc-side capacitors is a problem to be solved. To solve these two problems, a third harmonic injection optimization method on the basis of fundamental frequency zero sequence is proposed in this paper. The third harmonic with the same amplitude of fundamental modulated wave signal is injected into the modulated wave signal when the amplitude of synthesized wave signal is no greater than unity. Otherwise, the amplitude of third harmonic is decreased correspondingly to ensure the amplitude of synthesized wave signal being unity. With this method, the dc-side voltage pulsation is effectively restrained and the power balancing limit of CHB inverter is expanded. The feasibility and effectiveness of this method are verified by an experimental prototype of a three-phase seven-level CHB inverter.

#Cascaded H-bridge inverter #photovoltaic system #third harmonic injection #dc-side voltage pulsation

Abstract
I. INTRODUCTION
II. SUPPRESSION OF DC-SIDE VOLTAGE PULSATION BY THIRD HARMONIC INJECTION
III. POWER REDISTRIBUTION BY FUNDAMENTAL FREQUENCY ZERO SEQUENCE INJECTION
IV. EXTENSION OF POWER REDISTRIBUTION LIMIT AND SUPPRESSION OF DC-SIDE VOLTAGE PULSATION BY OPTIMIZED THIRD HARMONIC INJECTION
V. SIMULATION VERIFICATION
VI. EXPERIMENTAL RESULTS
VII. CONCLUSIONS
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