Duty cycle-based three-level space-vector pulse-width modulation with overmodulation and neutral-point balancing capabilities for three-phase neutral-point clamped inverters

In this study, a duty cycle-based space-vector pulse-width modulation (SVPWM) with overmodulation and capacitor voltage balance control for three-phase three-level neutral-point clamped (NPC) inverters is presented. On the basis of simple linear calculations of three-phase reference voltages, the proposed SVPWM can be derived, which avoids the trigonometry operation required by the conventional SVPWM. The modulation region can also be smoothly extended from the linear region to the overmodulation region through re-synthesising the three-phase reference voltages. This avoids the conventional non-linear function and look-up table. The neutral-point voltage balancing control is achieved via changing the duty cycle of the redundant small vectors in each switching period, which can be easily embedded into the proposed duty cycle-based SVPWM. The dynamic and steady-state performances of the proposed SVPWM are eventually verified by both simulation and experimental results.

[1]  Apostolos Dollas,et al.  Development of an FPGA-Based SPWM Generator for High Switching Frequency DC/AC Inverters , 2014, IEEE Transactions on Power Electronics.

[2]  Abdul R. Beig,et al.  Constant v/f induction motor drive with synchronised space vector pulse width modulation , 2012 .

[3]  F. Blaabjerg,et al.  Power electronics as efficient interface in dispersed power generation systems , 2004, IEEE Transactions on Power Electronics.

[4]  Abdul R. Beig,et al.  Space vector-based synchronised bus-clamping pulse width modulation algorithms for three-level voltage source inverter in overmodulation region , 2012 .

[5]  H. Abu-Rub,et al.  Phase-shifted pulse-width-amplitude modulation for quasi-Z-source cascade multilevel inverter-based photovoltaic power system , 2014 .

[6]  Pradyumn Chaturvedi,et al.  Reduced switching loss pulse width modulation technique for three-level diode clamped inverter , 2011 .

[7]  M. Saeedifard,et al.  Neuro-Computing Vector Classification SVM Schemes to Integrate the Overmodulation Region in Neutral Point Clamped (NPC) Converters , 2007, IEEE Transactions on Power Electronics.

[8]  Jan T. Bialasiewicz,et al.  Power-Electronic Systems for the Grid Integration of Renewable Energy Sources: A Survey , 2006, IEEE Transactions on Industrial Electronics.

[9]  D. Boroyevich,et al.  The nearest three virtual space vector PWM - a modulation for the comprehensive neutral-point balancing in the three-level NPC inverter , 2004, IEEE Power Electronics Letters.

[10]  Wenyuan Wang,et al.  Power Flow Algorithms for Multi-Terminal VSC-HVDC With Droop Control , 2014, IEEE Transactions on Power Systems.

[11]  Silverio Bolognani,et al.  Novel digital continuous control of SVM inverters in the overmodulation range , 1997 .

[12]  Ronald G. Harley,et al.  A fast and generalized space vector modulation scheme for multilevel inverters , 2013, 2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[13]  Joachim Holtz,et al.  Compensated synchronous PI current controller in overmodulation range and six-step operation of space-vector-modulation-based vector-controlled drives , 2002, IEEE Trans. Ind. Electron..

[14]  Ashwin M. Khambadkone,et al.  A simple space vector PWM scheme to operate a three-level NPC inverter at high modulation index including over-modulation region, with neutral point balancing , 2005 .

[15]  Rongxiang Zhao,et al.  Operation method for parallel inverter system with common dc link , 2014 .

[16]  Dushan Boroyevich,et al.  A comprehensive study of neutral-point voltage balancing problem in three-level neutral-point-clamped voltage source PWM inverters , 2000 .

[17]  Stig Munk-Nielsen,et al.  Overmodulation of n-Level Three-Leg DC - AC Diode-Clamped Converters With Comprehensive Capacitor Voltage Balance , 2013, IEEE Transactions on Industrial Electronics.

[18]  Joachim Holtz,et al.  On continuous control of PWM inverters in the overmodulation range including the six-step mode , 1993 .

[19]  Rong-Wu Zhu,et al.  Simplified SVPWM that Integrates Overmodulation and Neutral Point Potential Control , 2014 .

[20]  Joachim Holtz,et al.  Neutral point potential balancing algorithm at low modulation index for three-level inverter medium voltage drives , 2005 .

[21]  Xiaoli Du,et al.  A Generalized Half-Wave Symmetry SHE-PWM Formulation for Multilevel Voltage Inverters , 2010, IEEE Transactions on Industrial Electronics.

[22]  Qin Zhao,et al.  Hybrid PWM Strategy of SVPWM and VSVPWM for NPC Three-Level Voltage-Source Inverter , 2010, IEEE Transactions on Power Electronics.

[23]  Pramod Agarwal,et al.  Carrier-Based Neutral Point Potential Regulator With Reduced Switching Losses for Three-Level Diode-Clamped Inverter , 2014, IEEE Transactions on Industrial Electronics.

[24]  Roberto Cárdenas,et al.  Overview of control systems for the operation of DFIGs in wind energy applications , 2013, IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society.

[25]  Abdul Hamid Bhat,et al.  Capacitor Voltage Balancing of Three-Phase Neutral-Point-Clamped Rectifier Using Modified Reference Vector , 2014, IEEE Transactions on Power Electronics.

[26]  Yongchang Zhang,et al.  A Hybrid PWM Applied to High-Power Three-Level Inverter-Fed Induction-Motor Drives , 2011, IEEE Transactions on Industrial Electronics.