An improved SVPWM strategy for three-level active NPC inverter

An improved space vector PWM (SVPWM) strategy is proposed in this paper to balance the neutral-point voltage (NP) and reduce switching loss for three-level active neutral-point-clamped (ANPC) converter. Compared with the traditional SVPWM, the improved SVPWM strategy reduces the number of vectors and the switching frequency per cycle. So the switching losses can be reduced. According to the NP offset, different switching sequences are used to control the NP voltage. Therefore, the voltage on each capacitor can be controlled effectively. This strategy can balance the NP voltage, no matter which Space Vector Diagram (SVD) the reference vector locates in. Lastly, simulation and experimental results are provided to verify the effectiveness of the proposed control strategy.

[1]  D. G. Holmes,et al.  A generalised natural balance model and balance booster filter design for three level neutral point clamped converters , 2014, 2014 IEEE Energy Conversion Congress and Exposition (ECCE).

[2]  Li Yongdong.  Neutral-point Potential Balancing Problem of Five-level Active Neutral-point-clamped Inverter , 2012 .

[3]  T. Bruckner,et al.  Loss balancing in three-level voltage source inverters applying active NPC switches , 2001, 2001 IEEE 32nd Annual Power Electronics Specialists Conference (IEEE Cat. No.01CH37230).

[4]  Xiao-Ping Zhang,et al.  A DC current flow controller for meshed modular multilevel converter multiterminal HVDC grids , 2015 .

[5]  Philippe Baudesson,et al.  A New Carrier-Based PWM Providing Common-Mode-Current Reduction and DC-Bus Balancing for Three-Level Inverters , 2007, IEEE Transactions on Industrial Electronics.

[6]  P.K. Steimer,et al.  Feedforward Loss Control of Three-Level Active NPC Converters , 2007, IEEE Transactions on Industry Applications.

[7]  Lin Zhu,et al.  A Key Management Scheme for Secure Communications of Advanced Metering Infrastructure in Smart Grid , 2013, IEEE Trans. Ind. Electron..

[8]  Jiang Zheng-ron.  A Neutral-point Potential Balancing Algorithm for Three-level APF , 2015 .

[9]  Cungang Hu,et al.  Effect on harmonic performance for three-level ANPC converter with small change in SHEPWM switch angles , 2016, 2016 IEEE 11th Conference on Industrial Electronics and Applications (ICIEA).

[10]  Xiaoqiang Guo,et al.  Three-Phase CH7 Inverter With a New Space Vector Modulation to Reduce Leakage Current for Transformerless Photovoltaic Systems , 2017, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[11]  Donald Grahame Holmes,et al.  A Generalized Natural Balance Model and Balance Booster Filter Design for Three-Level Neutral-Point-Clamped Converters , 2015, IEEE Transactions on Industry Applications.

[12]  Jianhua Zhang,et al.  A hybrid forecasting model with parameter optimization for short-term load forecasting of micro-grids , 2014 .

[13]  Xinghuo Yu,et al.  An Improved Virtual Space Vector Modulation Scheme for Three-Level Active Neutral-Point-Clamped Inverter , 2017, IEEE Transactions on Power Electronics.

[14]  Kui Wang,et al.  Capacitor Voltage Balancing of a Five-Level ANPC Converter Using Phase-Shifted PWM , 2015, IEEE Transactions on Power Electronics.