Proportional-Integral and Proportional-Resonant Based Control Strategy for PUC Inverters

In this paper, a proportional-integral (PI) and proportional-resonant (PR) based control strategy is proposed for packed-U-cell (PUC) inverters. In the conventional PI-PI based control strategy, while the first PI regulates the DC capacitor voltage, the second PI regulates the AC load current. However, it is shown that the second PI cannot guarantee zero tracking error in the load current. The main reason of this comes from the fact that PI controllers are not able to achieve zero tracking error for the AC signals. Also, in an attempt to reduce the tracking error by tuning PI gains distorts the load current. In this study, a PI-PR based control strategy is obtained by replacing the second PI by a PR controller. The performances of both PI-PI and PI-PR control methods have been compared. It is shown that the load current to tracks its reference in all circumstances provided that the inverter current reference is generated accurately. Computer simulations are conducted to show the steady-state and dynamic performances of both control methods.

[1]  Kamal Al-Haddad,et al.  Packed U Cells Multilevel Converter Topology: Theoretical Study and Experimental Validation , 2011, IEEE Transactions on Industrial Electronics.

[2]  José R. Rodríguez,et al.  A Survey on Neutral-Point-Clamped Inverters , 2010, IEEE Transactions on Industrial Electronics.

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

[4]  Jun Liang,et al.  Modified Phase-Shifted PWM Control for Flying Capacitor Multilevel Converters , 2007, IEEE Transactions on Power Electronics.

[5]  Hadi Youssef Kanaan,et al.  A new voltage balancing controller applied on 7-level PUC inverter , 2014, IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society.

[6]  T.A. Meynard,et al.  Multi-level conversion: high voltage choppers and voltage-source inverters , 1992, PESC '92 Record. 23rd Annual IEEE Power Electronics Specialists Conference.

[7]  Haitham Abu-Rub,et al.  Finite-Control-Set Model Predictive Control for Grid-Connected Packed-U-Cells Multilevel Inverter , 2016, IEEE Transactions on Industrial Electronics.

[8]  Kamal Al-Haddad,et al.  A Novel Six-Band Hysteresis Control for the Packed U Cells Seven-Level Converter: Experimental Validation , 2012, IEEE Transactions on Industrial Electronics.

[9]  Haitham Abu-Rub,et al.  Multi-objective model predictive control for grid-tied 15-level packed U cells inverter , 2016, 2016 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe).

[10]  Frede Blaabjerg,et al.  Proportional-resonant controllers and filters for grid-connected voltage-source converters , 2006 .

[11]  Haitham Abu-Rub,et al.  Model predictive control of packed U cells based transformerless single-phase dynamic voltage restorer , 2018, 2018 IEEE International Conference on Industrial Technology (ICIT).

[12]  Hani Vahedi,et al.  Real-Time Implementation of a Seven-Level Packed U-Cell Inverter with a Low-Switching-Frequency Voltage Regulator , 2016, IEEE Transactions on Power Electronics.

[13]  Hani Vahedi,et al.  Sensor-Less Five-Level Packed U-Cell (PUC5) Inverter Operating in Stand-Alone and Grid-Connected Modes , 2016, IEEE Transactions on Industrial Informatics.

[14]  Robert S. Balog,et al.  A Model Predictive Control technique for utility-scale grid connected battery systems using packed U cells multilevel inverter , 2016, IECON 2016 - 42nd Annual Conference of the IEEE Industrial Electronics Society.