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WANG Xiaopeng,ZHU Tianliang,CHENG Dongliang,FANG Chao.Three-level Inverter Dead-time Compensation Based on Phase Voltage Feedback[J].JOURNAL OF POWER SUPPLY,2021,19(2):48-56
Three-level Inverter Dead-time Compensation Based on Phase Voltage Feedback
Received:May 02, 2019  Revised:March 06, 2021
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DOI:10.13234/j.issn.2095-2805.2021.2.48
Keywords:three-level inverter  dead-time compensation  phase voltage feedback  current reconstruction  Kalman filtering
Fund Project:The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)
           
AuthorInstitutionEmail
WANG Xiaopeng School of Electronic and Information Engineering, Lanzhou Jiaotong University, Lanzhou , China wangxp1969@sina.com
ZHU Tianliang School of Electronic and Information Engineering, Lanzhou Jiaotong University, Lanzhou , China
CHENG Dongliang School of Electronic and Information Engineering, Lanzhou Jiaotong University, Lanzhou , China
FANG Chao School of Electronic and Information Engineering, Lanzhou Jiaotong University, Lanzhou , China
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Abstract:
      To prevent the direct-through of the upper and lower arms of an inverter, it is usually necessary to add dead-time to the driving signal of switching tubes. However, the dead-time may lead to the distortion of output voltage and current. To solve the dead-time compensation problem of a diode neutral-point clamped (NPC) three-level inverter, a dead-time compensation strategy is proposed based on the voltage errors obtained using the online phase voltage feedback calculation. Under the d-q synchronous rotating coordinate system, the error voltage is calculated in real time according to phase voltage feedback. At the same time, aimed at the current phase shift problem caused by the traditional filter used in the current polarity judgment, a Kalman filter is adopted to process the three-phase output current under the d-q synchronous rotating coordinate system. Afterwards, the filtered current is reconstructed into a three-phase stationary coordinate system, thus determining the current polarity without phase shift. Simulation results show that the proposed method can accurately judge the current polarity and adjust the compensation voltage adaptively, thereby effectively reducing the harmonic content of the output voltage.
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