Control scheme for source voltage sensorless PWM converters under source voltage unbalance

This paper presents a control scheme for three-phase PWM converters which have no ac-side voltage sensors. In spite of no source voltage sensors, the proposed method estimates exact grid angle and voltages, which are the essential parts for the power transfer between DC link of PWM converter and AC source. The method works not only in normal balanced AC source case but also in faulty unbalanced cases. The validity of proposed method has been evaluated by computer simulation and experimental result with 10kW PWM Voltage source converter.

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

[2]  R. Wu,et al.  Analysis of an AC to DC voltage source converter using PWM with phase and amplitude control , 1989, Conference Record of the IEEE Industry Applications Society Annual Meeting,.

[3]  P. Enjeti,et al.  A new control strategy to improve the performance of a PWM AC to DC converter under unbalanced operating conditions , 1991, PESC '91 Record 22nd Annual IEEE Power Electronics Specialists Conference.

[4]  Tokuo Ohnishi,et al.  Line voltage sensorless three phase PWM converter by tracking control of operating frequency , 1997, Proceedings of Power Conversion Conference - PCC '97.

[5]  T.M. Jahns,et al.  Phase Current Reconstruction for AC Motor Drives using a DC-link Single Current Sensor and Measurement Voltage Vectors , 2006, 2005 IEEE 36th Power Electronics Specialists Conference.

[6]  Seung-Ki Sul,et al.  A new phase detecting method for power conversion systems considering distorted conditions in power system , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).

[7]  Dong-Choon Lee,et al.  AC voltage and current sensorless control of three-phase PWM rectifiers , 2002 .

[8]  Hong-Seok Song,et al.  Dual current control scheme for PWM converter under unbalanced input voltage conditions , 1999, IEEE Trans. Ind. Electron..

[9]  V. Kaura,et al.  Operation of a voltage source converter at increased utility voltage , 1995, Proceedings of PESC '95 - Power Electronics Specialist Conference.

[10]  Math Bollen,et al.  Understanding Power Quality Problems: Voltage Sags and Interruptions , 1999 .

[11]  Toshihiko Noguchi,et al.  Direct power control of PWM converter without power source voltage sensors , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.

[12]  P. Rioual,et al.  Regulation of a PWM rectifier in the unbalanced network state using a generalized model , 1996 .

[13]  Seung-Ki Sul,et al.  Sensorless operation of permanent magnet motor using direct voltage sensing circuit , 2002, Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344).

[14]  Paolo Mattavelli.  A closed-loop selective harmonic compensation for active filters , 2001 .

[15]  Dong-Choon Lee,et al.  AC voltage and current sensorless control of three-phase PWM rectifiers , 2000, 2000 IEEE 31st Annual Power Electronics Specialists Conference. Conference Proceedings (Cat. No.00CH37018).

[16]  Seung-Ki Sul,et al.  Sensorless Operation of a PWM Rectifier for a Distributed Generation , 2007, IEEE Transactions on Power Electronics.

[17]  V. Blasko,et al.  A new mathematical model and control of a three-phase AC-DC voltage source converter , 1997 .

[18]  F. Blaabjerg,et al.  Sensorless control strategies for PWM rectifier , 2000, APEC 2000. Fifteenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.00CH37058).

[19]  Hong-Seok Song,et al.  Source voltage sensorless estimation scheme for PWM rectifiers under unbalanced conditions , 2003, IEEE Trans. Ind. Electron..