scholarly journals Full Range Capacitor Voltage Balance PWM Strategy for Diode-Clamped Multilevel Inverter

Electronics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 1263 ◽  
Author(s):  
Jinping Wang ◽  
Juncan Wang ◽  
Benxian Xiao ◽  
Zaiyi Gui ◽  
Weidong Jiang
Keyword(s):  
Pulse Width Modulation ◽  
Full Range ◽  
Virtual Space ◽  
Multilevel Inverter ◽  
Switching Loss ◽  
Paper Briefly ◽  
Capacitor Voltage ◽  
Voltage Balance ◽  
Modulation Model ◽  
Capacitor Voltage Balance

This paper briefly reviews virtual space vector pulse width modulation (VSVPWM) for the diode-clamped multilevel inverter (DCMLI). Based on the universal modulation model of the DCMLI with N-level, a modulation strategy named as full range capacitor voltage balance PWM (FRCVBPWM) is proposed, which has similar capacitor voltage balance characteristics as VSVPWM. The characteristic of FRCVBPWM is that there are respectively zero, N − 1 and N − 2 switching actions for the three phases of the DCMLI. Therefore, the total switching actions are greatly decreased compared with VSVPWM. The switching loss comparison between FRCVBPWM and VSVPWM is conducted by comprehensive simulations. Finally, the feasibility and superiority of FRCVBPWM over VSVPWM is verified by experiments.

scholarly journals Integrated Control and Modulation for Three-Level NPC Rectifiers

Energies ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1641 ◽  
Author(s):  
Antonio Ventosa-Cutillas ◽  
Pablo Montero-Robina ◽  
Francisco Umbría ◽  
Federico Cuesta ◽  
Francisco Gordillo
Keyword(s):  
Integrated Control ◽  
Virtual Space ◽  
Voltage Balancing ◽  
Control Approach ◽  
Novel Approach ◽  
Capacitor Voltage ◽  
Voltage Balance ◽  
Vector Modulation ◽  
Capacitor Voltage Balance ◽  
Voltage Dynamics

This paper uses a novel approach for the control of three-level neutral-point-clamped (NPC) rectifiers in order to tackle the capacitor voltage balance problem. A distinctive feature of the new control approach is that it is based on a model which is written in terms of the duty ratios for each phase at each level. Hence, the system model presents nine duty cycle variables. Despite the fact that this formulation is different from the usual ones, it is shown that the control problem of currents and dc-link voltage can be formulated in a similar way to conventional methods. Furthermore, the control of the capacitor voltage balance can be expressed by means of equations that are decoupled from the currents and dc-link voltage dynamics, which results in a specific controller for the voltage balancing that does not affect the previous dynamics. A key point of the proposed approach is that part of the modulation stage is implicit in the formulation. Two particular controllers are compared in this paper. The first one fulfills the different control objectives at the expense of a large number of commutations. This problem is overcome in a new proposed controller, which presents similar performance and a satisfactory number of commutations. Experimental results are performed showing the effectiveness compared with a modified virtual space vector modulation with capacitor voltage balance capabilities.

scholarly journals Pulsewidth Modulations for the Comprehensive Capacitor Voltage Balance of $n$-Level Three-Leg Diode-Clamped Converters

2009 ◽  
Vol 24 (5) ◽  
pp. 1364-1375 ◽  
Author(s):  
Sergio Busquets-Monge ◽  
Salvador Alepuz ◽  
Joan Rocabert ◽  
Josep Bordonau
Keyword(s):  
N Level ◽  
Capacitor Voltage ◽  
Voltage Balance ◽  
Capacitor Voltage Balance
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