Novel Active Nested Neutral-Point Piloted Nine-level Converter
- Resource Type
- Conference
- Authors
- Hussein, Ahmed S.; Ghias, Amer
- Source
- 2019 IEEE Energy Conversion Congress and Exposition (ECCE) Energy Conversion Congress and Exposition (ECCE), 2019 IEEE. :3631-3636 Sep, 2019
- Subject
- Aerospace
Fields, Waves and Electromagnetics
Power, Energy and Industry Applications
Capacitors
Modulation
Switches
Topology
Cost function
Voltage control
Voltage measurement
Multilevel converters
capacitor voltage control
cost function
PD-PWM
- Language
- ISSN
- 2329-3748
This paper presents a new nine-level converter and its modulation for the medium- and high-voltage applications. The converter’s topology is based on the combination of the five-level active neutral-point-clamped (ANPC) and the neutral-point piloted (NPP) converters and is called the Nine-Level Active Nested Neutral-Point Piloted converter. The converter consist of three flying capacitors (FCs) per phase, which can be maintained at a nominal reference voltage using the converter’s redundant switching states. The proposed modulation is based on a phase-disposition pulse width modulation (PD-PWM) that incorporates a minimum energy property cost function along with a dynamic reference generation technique to improve the FCs voltage and the converter’s performance. Both the steady-state and transient performance of the converter have been investigated. The results indicate a high-quality output waveform and a sufficient capacitor voltage balancing control that guarantees a safe operation of the proposed converter. Additionally, the dc-link capacitor voltage ripple has been analyzed for all modulation indices and load power factors. The analysis shows a significant increase in the voltage ripple at high modulation indices.