Industrial Inverter Current Sensing With Three Shunt Resistors: Limitations and Solutions

As inverter powered variable speed drives become popular and technically mature, cost control becomes the core competence for inverter manufacturers. Under minimum performance requirement specifications, the inverter is tailored in every aspect, from the main power device to various sensors to enhance its competitiveness. This paper mainly focuses on various issues associated with the downgrade of current sensors from standard Hall sensor to shunt resistors. The limitation of current sensing by shunt resistors is reviewed and method to expand the maximum achievable modulation index on the vector plane is implemented. Experiments are conducted to verify the analysis and to validate the effectiveness of the reconstruction algorithm.

[1]  Frede Blaabjerg,et al.  A New Low-Cost, Fully Fault Protected PWM-VSI Inverter with True Phase-Current Information , 1995 .

[2]  Barry W. Williams,et al.  Derivation of motor line-current waveforms from the DC-link current of an inverter , 1989 .

[3]  R.D. Lorenz,et al.  Using low resolution position sensors in bumpless position/speed estimation methods for low cost PMSM drives , 2005, Fourtieth IAS Annual Meeting. Conference Record of the 2005 Industry Applications Conference, 2005..

[4]  T.M. Jahns,et al.  Phase Current Reconstruction for AC Motor Drives Using a DC Link Single Current Sensor and Measurement Voltage Vectors , 2006, IEEE Transactions on Power Electronics.

[5]  Marco Tursini,et al.  Low cost phase current sensing in DSP based AC drives , 1999, ISIE '99. Proceedings of the IEEE International Symposium on Industrial Electronics (Cat. No.99TH8465).

[6]  Dong-Seok Hyun,et al.  A novel control method for three-phase PWM rectifiers using a single current sensor , 2000 .

[7]  T.G. Habetler,et al.  A low cost stator flux oriented voltage source variable speed drive , 1990, Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting.

[8]  S. Chi,et al.  A Current Reconstruction Scheme for Low-Cost PMSM Drives Using Shunt Resistors , 2007, APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition.

[9]  F. Blaabjerg,et al.  Single current sensor technique in the DC-link of three-phase PWM-VS inverters. A review and the ultimate solution , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.

[10]  J.D. van Wyk,et al.  An overview of integratable current sensor technologies , 2003, 38th IAS Annual Meeting on Conference Record of the Industry Applications Conference, 2003..

[11]  Xiaomeng Cheng,et al.  A Three-Phase Current Reconstruction Technique Using Single DC Current Sensor Based on TSPWM , 2014, IEEE Transactions on Power Electronics.

[12]  Jung-Ik Ha,et al.  Voltage injection method for boundary expansion of output voltages in three shunt sensing PWM inverters , 2011, 8th International Conference on Power Electronics - ECCE Asia.

[13]  Dong-Seok Hyun,et al.  Comparison of single-sensor current control in the DC link for three-phase voltage-source PWM converters , 2001, IEEE Trans. Ind. Electron..

[14]  R. Petrella,et al.  A Novel Solution for Phase Current Sensing in PWM-VSI Based AC Drives , 2001 .

[15]  S. Ziegler,et al.  Current Sensing Techniques: A Review , 2009, IEEE Sensors Journal.

[16]  T. Holmgaard,et al.  Active three-phase rectifier with only one current sensor in the DC-link , 1999, Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No.99TH8475).

[17]  Jung-Ik Ha,et al.  Analysis of the Phase Current Measurement Boundary of Three Shunt Sensing PWM Inverters and an Expansion Method , 2013 .