Comparison of two modulation strategies for a three level inverter synchronous reluctance motor (SynRM) drive

In this paper, two modulation strategies for a three level neutral point clamped inverter SynRM drive are compared. The inverter uses two different algorithms called Mod-1 and Mod-2 for balancing the two dc bus capacitor voltages (suppression of the neutral point voltage). These modulation strategies are of the nearest three vector (NTV) family. Mod-1 chooses certain vector states to suppress the neutral point (NP) voltage ripple, whereas Mod-2 makes use of the inverter vector state's dwell time. The parameters of interest are the torque ripple, the neutral point voltage ripple and the inverter efficiency. The inverter was operated at a switching frequency of 10 kHz. The SynRM core losses were independent of the two modulation strategies, though lower torque ripples and better power quality were registered on Mod-2 strategy. Mod-1 strategy had 18% higher inverter efficiency during transient operation. Mod-2 strategy had 11% more NP voltage ripple during transient operation. The Mod-1 strategy supressed the NP voltage ripple throughout the machine's operation.

[1]  Dushan Boroyevich,et al.  New feedforward space-vector PWM method to obtain balanced AC output voltages in a three-level neutral-point-clamped converter , 2002, IEEE Trans. Ind. Electron..

[2]  Maarten J. Kamper,et al.  Performance of a Hybrid Electric Vehicle Using , 2001 .

[3]  Gyu-Hyeong Cho,et al.  DSP based space vector PWM for three-level inverter with DC-link voltage balancing , 1991, Proceedings IECON '91: 1991 International Conference on Industrial Electronics, Control and Instrumentation.

[4]  Jie Zhang.  High performance control of a three-level IGBT inverter fed AC drive , 1995, IAS '95. Conference Record of the 1995 IEEE Industry Applications Conference Thirtieth IAS Annual Meeting.

[5]  Maarten J. Kamper,et al.  Reluctance synchronous machine drive for hybrid electric vehicle , 1998, IEEE International Symposium on Industrial Electronics. Proceedings. ISIE'98 (Cat. No.98TH8357).

[6]  Dushan Boroyevich,et al.  Evaluation of the low-frequency neutral-point voltage oscillations in the three-level inverter , 2005, IEEE Transactions on Industrial Electronics.

[7]  G. I. Orfanoudakis,et al.  Nearest-Vector Modulation Strategies With Minimum Amplitude of Low-Frequency Neutral-Point Voltage Oscillations for the Neutral-Point-Clamped Converter , 2013, IEEE Transactions on Power Electronics.

[8]  D. Borojevic,et al.  A comprehensive study of neutral-point voltage balancing problem in three-level neutral-point-clamped voltage source PWM inverters , 1999, APEC '99. Fourteenth Annual Applied Power Electronics Conference and Exposition. 1999 Conference Proceedings (Cat. No.99CH36285).

[9]  Josep Pou,et al.  A Comprehensive Study of a Hybrid Modulation Technique for the Neutral-Point-Clamped Converter , 2009, IEEE Transactions on Industrial Electronics.

[10]  Marco Ferrari,et al.  Design of Synchronous Reluctance Motor for Hybrid Electric Vehicles , 2015, IEEE Transactions on Industry Applications.

[11]  Ion Boldea.  Reluctance synchronous machines and drives , 1996 .

[12]  A.M. Hava,et al.  A novel neutral point potential stabilization technique using the information of output current polarities and voltage vector , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[13]  Maarten J. Kamper,et al.  Performance of a reluctance synchronous machine under vector control , 1993, Proceedings of IEEE Power Electronics Specialist Conference - PESC '93.

[14]  Mark Sumner,et al.  Neutral point control for multi-level inverters: theory, design and operational limitations , 1997, IAS '97. Conference Record of the 1997 IEEE Industry Applications Conference Thirty-Second IAS Annual Meeting.

[15]  Hirofumi Akagi,et al.  A New Neutral-Point-Clamped PWM Inverter , 1981, IEEE Transactions on Industry Applications.

[16]  G. I. Orfanoudakis,et al.  Hybrid Modulation Strategies for Eliminating Low-Frequency Neutral-Point Voltage Oscillations in the Neutral-Point-Clamped Converter , 2013, IEEE Transactions on Power Electronics.