In this letter, a hybrid modulation concept consisting of three-level space vector modulation (3L-SVM) and phase-shifted pulse width modulation (PS-PWM) is proposed for five-level active neutral- point-clamped (5L-ANPC) converter. Under this concept, a simpler 3L-SVM plus PS-PWM scheme is applied to realize 5L modulation, instead of using complex 5L-SVM. The control of neutral voltage, flying capacitor voltage, and the improved dc voltage utilization are all implemented. With the help of the proposed concept, well-developed 3L-SVM schemes can be directly applied to the 5L-ANPC converter, which significantly simplify the gating signal generation. This concept can also be applied to other hybrid clamped 5L converters with two dc-link capacitors. It provides a unique solution, which utilize lower level SVM scheme to control higher level multilevel converters.

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Hybrid Modulation Concept for Five-Level Active-Neutral-
Point-Clamped Converter
ABSTRACT:
In this letter, a hybrid modulation concept consisting of three-level space vector modulation (3L-
SVM) and phase-shifted pulse width modulation (PS-PWM) is proposed for five-level active
neutral- point-clamped (5L-ANPC) converter. Under this concept, a simpler 3L-SVM plus PS-
PWM scheme is applied to realize 5L modulation, instead of using complex 5L-SVM. The
control of neutral voltage, flying capacitor voltage, and the improved dc voltage utilization are
all implemented. With the help of the proposed concept, well-developed 3L-SVM schemes can
be directly applied to the 5L-ANPC converter, which significantly simplify the gating signal
generation. This concept can also be applied to other hybrid clamped 5L converters with two dc-
link capacitors. It provides a unique solution, which utilize lower level SVM scheme to control
higher level multilevel converters.
KEYWORDS:
1. Five-level active-neutral-point-clamped (5LANPC)
2. Multilevel converter
3. Phase-shifted pulse width modulation (PS-PWM)
4. Space vector modulation (SVM)
SOFTWARE: MATLAB/SIMULINK

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BLOCK DIAGRAM:
Fig. 1 Single-phase circuit of a 5L-ANPC converter.

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EXPECTED SIMULATION RESULTS:
Fig. 2. Waveforms of modulation wave Vma , phase voltage vphase , line–line voltage vl l , three-phase current, two
dc-link capacitor voltage, and three-phase FC voltage of 5L-ANPC converter with proposed hybrid modulation
concept: (a) M = 0.23. (b) M = 1.15. (c) Neutral voltage and FC voltage control.

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Fig. 3. Comparison waveforms of modulation wave Vma , phase voltage vphase , line–line voltage vl l , three-phase
current, two dc-link capacitor voltage, and three-phase FC voltage of 5L-ANPC converter with PS-PWM in [5]: (a)
M = 0.23. (b) M = 1.15. (c) Neutral voltage and FC voltage control.
CONCLUSION:
In this letter, a new hybrid modulation concept is proposed for 5L-ANPC converters. Instead of
using 5L-SVM, it applies 3L-SVM plus PS-PWM to modulate the 5L-ANPC converters. With
the proposed concept, the control of neutral voltage, FC voltage, and the increased voltage
utilization are all realized. Well-developed 3L-SVM schemes can be applied directly to simplify
the modulation process. The simulation and experiment have proved the effectiveness of the
modulation scheme. Although this modulation concept is developed for 5L-ANPC converter, it
can also be applied to other hybrid 5L converters with two dc-link capacitors [13]. By dividing
these converters into two cells, 3L-SWM can be applied to their 3L converter cells, while both

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cells are together modulated by PS-PWM using the modulation waves derived from 3L-SVM.
The proposed concept provides a unique solution which utilize lower level SVM scheme to
modulation higher level multilevel converters at desired performance.
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Jul./Aug. 2012.
[2] P. Barbosa, P. Steimer, J. Steinke, M. Winkelnkemper, and N. Celanovic, “Active-neutral-
point-clamped (ANPC) multilevel converter technology,” in Proc. Power Electron. Appl. Eur.
Conf., 2005, pp. 1–10.
[3] J. Li, Z. Pan, and R. Burgos, “A new control scheme of five-level active NPC converters for
common mode voltage mitigation in medium voltage drives,” in Proc. IEEE Energy Convers.
Congr. Expo., 2014, pp. 234–241.
[4] R. T. Hamid, S. Danny, M. M. Kashem, and C. Phil, “Novel modulation and control strategy
for five-level ANPC converter with unbalanced DC voltage applied to a single-phase grid
connected PV system,” in Proc. IEEE Ind. Appl. Soc. Annu. Meet., 2013, pp. 1–8.
[5] K. Wang, L. Xu, Z. Zheng, and Y. Li, “Capacitor voltage balancing of a five-level ANPC
converter using phase-shifted PWM,” IEEE Trans. Power Electron., vol. 30, no. 3, pp. 1147–
1156, Mar. 2015.