Improved Neutral-Point Voltage-Shifting Strategy for Power Balancing in Cascaded NPC/H-Bridge Inverter
| Autor: | Jin-Wook Kang, Seung-Wook Hyun, Chung-Yuen Won, Jae-Ok Ha |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
neutral-point voltage-shifting control
Computer Networks and Communications Computer science lcsh:Electronics 020208 electrical & electronic engineering lcsh:TK7800-8360 020206 networking & telecommunications 02 engineering and technology cascaded NPC/H-bridge inverter H bridge inverter Power (physics) Line current power balancing Hardware and Architecture Control and Systems Engineering Neutral point voltage Control theory Power balancing Signal Processing 0202 electrical engineering electronic engineering information engineering Inverter Electrical and Electronic Engineering Voltage reference |
| Zdroj: | Electronics Volume 7 Issue 9 Electronics, Vol 7, Iss 9, p 167 (2018) |
| ISSN: | 2079-9292 |
| DOI: | 10.3390/electronics7090167 |
| Popis: | This paper investigates the fault-tolerance control of a multilevel cascaded NPC/H-bridge (CNHB) inverter. The fault-tolerance control method has been widely used for multilevel inverters, such as the neutral-point voltage-shifting control, which can operate for a certain period of time by compensating for the phase voltage of a faulty stack even if one stack is broken. Even though the three-phase equilibrium is maintained in the case of failure by using the conventional neutral-point voltage-shifting control, an imbalance in the output power occurs between each stack, which causes problems for maintenance and lifetime. Therefore, this paper proposes a fault-tolerance control that can maintain three-phase equilibrium in a case of stack failures and minimize power imbalances between the stacks. The problem of the conventional neutral-point voltage-shifting control is presented based on the output power. In addition, the power imbalance is improved by performing selective neutral-point voltage-shifting control according to the reference voltage range. To verify the principle and feasibility of the proposed neutral-point voltage-shifting control method, a simulation and an experiment are implemented with the CNHB inverter. |
| Databáze: | OpenAIRE |
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