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AI Sheng,XIAO Fei,ZENG Qifan,XIE Zhen,REN Qiang.Calculation of DC-link Capacitive Current in Multi-phase H-bridge Inverter[J].JOURNAL OF POWER SUPPLY,2018,16(3):106-112
Calculation of DC-link Capacitive Current in Multi-phase H-bridge Inverter
Received:July 12, 2016  Revised:September 19, 2017
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DOI:10.13234/j.issn.2095-2805.2018.3.106
Keywords:DC-link capacitor  multi-phase H-bridge  SPWM modulation  RMS current
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AI Sheng National Key Laboratory of Science and Technology on Vessel Integrated Power System, Naval University of Engineering, Wuhan , China
XIAO Fei National Key Laboratory of Science and Technology on Vessel Integrated Power System, Naval University of Engineering, Wuhan , China
ZENG Qifan National Key Laboratory of Science and Technology on Vessel Integrated Power System, Naval University of Engineering, Wuhan , China shovenveryk@126.com
XIE Zhen National Key Laboratory of Science and Technology on Vessel Integrated Power System, Naval University of Engineering, Wuhan , China
REN Qiang National Key Laboratory of Science and Technology on Vessel Integrated Power System, Naval University of Engineering, Wuhan , China
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Abstract:
      The calculation of DC-link capacitive current is one key step in inverter design. However, most of the existing methods are designed aiming at the traditional three-phase inverters, and there is few research related to the calculation of multiphase inverters. In light of the DC-side parallel multi-phase H-bridge inverter and the modulation principle of SPWM, the RMS of DC-link capacitive current is calculated using the switch function method, and the formula for calculating the RMS of DC-link capacitive current in any finite-phase inverter with this circuit topology is given. In addition, the effect of the number of phases, modulation ratio and power factor on the RMS of capacitive current is analyzed. Simulation and experimental results showed that this calculation method had higher accuracy, and the proposed formula can effectively realize the calculation of DC-link capacitive current in multi-phase H-bridge inverters.
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