PV-grid system in mismatch operating mode: Improvement through a new voltage balancing method in multilevel NPC inverters

In this paper a balancing control of the dc input voltage of a 3-Level and 5-Level Neutral Point Clamped Inverters (3L-npc and 5L-npc) is proposed. In renewable applications and injection to AC bus, are often used boost converters and inverter. The proposed control allows independent MPPT for each source in a Distributed-MPPT (DMPPT) configuration. It is known that the DMMPT offers improvements in annual energy compared to a Centralized-MPPT (CMPPT). A model for current in neutral point is proposed for 3L-npc. Furthermore, a generalization of balancing algorithm for 5L-npc is presented. The local stability of the balancing is ensured. The effectiveness is validated by simulations and experimental results.

[1]  S.V. Araujo,et al.  LCL filter design for grid-connected NPC inverters in offshore wind turbines , 2007, 2007 7th Internatonal Conference on Power Electronics.

[2]  Jean-Philippe Martin,et al.  A PSO-Based Global MPPT Technique for Distributed PV Power Generation , 2015, IEEE Transactions on Industrial Electronics.

[3]  Wang Yue,et al.  Research on DC capacitor voltage self-balancing space vector modulation strategy of five-level NPC converter , 2014, 2014 IEEE Applied Power Electronics Conference and Exposition - APEC 2014.

[4]  Dragan Maksimovic,et al.  Performance of Power-Limited Differential Power Processing Architectures in Mismatched PV Systems , 2015, IEEE Transactions on Power Electronics.

[5]  Massimo Vitelli,et al.  Distributed maximum power point tracking of photovoltaic arrays: Novel approach and system analysis , 2008, IEEE Transactions on Industrial Electronics.

[6]  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.

[7]  Serge Pierfederici,et al.  A Control Strategy for Electric Traction Systems Using a PM-Motor Fed by a Bidirectional $Z$-Source Inverter , 2014, IEEE Transactions on Vehicular Technology.

[8]  M. S. Boucherit,et al.  Control of capacitor voltage of three phase five-level NPC voltage source inverter. Application to inductor motor drive. , 2007, 2007 International Aegean Conference on Electrical Machines and Power Electronics.

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

[10]  Kai Yao,et al.  Variable Modulation Offset SPWM Control to Balance the Neutral-Point Voltage for Three-Level Inverters , 2015, IEEE Transactions on Power Electronics.

[11]  R. Naderi,et al.  Phase-Shifted Carrier PWM Technique for General Cascaded Inverters , 2008, IEEE Transactions on Power Electronics.

[12]  M. Vitelli,et al.  Optimization of perturb and observe maximum power point tracking method , 2005, IEEE Transactions on Power Electronics.

[13]  Bernard Davat,et al.  Energy Management of a Fuel Cell/Supercapacitor/Battery Power Source for Electric Vehicular Applications , 2011, IEEE Transactions on Vehicular Technology.