A Current Reconstruction Strategy Following the Operation Area in a 1-Shunt Inverter System

Chang-Hwan Park, Dong-Youn Kim, Han-Beom Yeom, Yung-Deug Son and Jang-Mok Kim
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Chang-Hwan Park: Department of Electrical and Computer Engineering, Pusan National University; Busan 46241, Korea
Dong-Youn Kim: Department of Electrical and Computer Engineering, Pusan National University; Busan 46241, Korea
Han-Beom Yeom: LG Electronics, Changwon 51544, Korea
Yung-Deug Son: Department of Mechanical Facility Control Engineering, Korea University of Technology and Education, Cheonan, Chungnam 31253, Korea
Jang-Mok Kim: Department of Electrical and Computer Engineering, Pusan National University; Busan 46241, Korea

Energies, 2019, vol. 12, issue 8, 1-16

Abstract: To reduce the cost of the inverter system in home appliances, a method using a shunt resistor at the DC-link can be substituted for a method using two current sensors at the inverter output. However, the minimum time of the active vector is required to sample the accurate current using a 1-shunt resistor. Therefore, many studies have been conducted investigating current reconstruction methods in the unmeasurable region of the current. The conventional methods using voltage injection have some problems such as high THD (Total Harmonic Distortion) and acoustic noise, because the PWM pattern is shifted. In addition, the current reconstruction is inaccurate in a low modulation region. In this paper, the cause of the noise in conventional methods is analyzed and a simple current reconstruction method based on an average current estimation and a current reference is utilized for reducing acoustic noise. In an immeasurable area, especially a low modulation region, an intermittent PWM shift method is proposed to enhance the accuracy of the reconstructed current. Therefore, a control strategy that combines all of the mentioned methods is implemented for the entire operating range. The effectiveness of the proposed methods is verified through the experimental results and the results of sound measurement in an anechoic chamber are included to compare with the acoustic noise.

Keywords: AC motor drive; acoustic noise; current estimation; current reconstruction; intermittent PWM shift; low modulation region; shunt resistor; SVPWM; three-phase inverter (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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