Improved Neutral-Point Voltage Balancing Control With Time Delay Compensation and Antiwindup Loop for a Three-Level NPC Inverter
- Title
- Improved Neutral-Point Voltage Balancing Control With Time Delay Compensation and Antiwindup Loop for a Three-Level NPC Inverter
- Author
- 김성민
- Keywords
- Voltage control; Pulse width modulation; Inverters; Delay effects; Windup; Delays; Capacitors; Antiwindup loop; carrier-based pulsewidth modulation (CBPWM); digital delay; multilevel converter; neutral-point (NP) voltage balancing; three-level inverter
- Issue Date
- 2021-09
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Citation
- IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, Page. 4970-4980
- Abstract
- This article proposes an improved neutral-point voltage balancing control (NPVBC) with time delay compensation
and an antiwindup loop based on a dynamic change limit for a
three-level neutral-point clamped (NPC) voltage-source inverter.
NPVBC is essential for a three-level NPC inverter since it has
a separate dc link. In an NPVBC based on the carrier-based
pulsewidth modulation (CBPWM), the neutral-point (NP) voltage
is regulated by synthesizing the NP current. The conventional NP
voltage balancing controller is designed as a proportional–integral
controller; however, time delays due to the digital control and
pulsewidth modulation, and antiwindup loop were not considered
despite the fact that digital control delay disturbs the accurate
synthesis of NP current and the windup phenomenon may appear
on the regulator since synthesizable NP current range can be
limited by operating condition. To solve these problems, this article
proposes improvement methods for NPVBC with digital delay
compensation and an antiwindup loop based on CBPWM. Analysis
on the effect of digital delay is described, and the time delays
compensation method is proposed. Furthermore, an NP voltage
balancing controller with an antiwindup loop is proposed along
with an analysis of the synthesizable NP current range. With the
proposed method, NP voltage ripples can be reduced, and control
stability of the NPVBC can be greatly improved by preventing
the windup phenomenon that may occur when the inverter output
is insufficient. To verify the proposed methods, simulations and
experiments, including elevator tower test, were conducted, and
the results verify the effectiveness of the proposed methods.
- URI
- https://ieeexplore.ieee.org/document/9444142https://repository.hanyang.ac.kr/handle/20.500.11754/170646
- ISSN
- 00939994; 19399367
- DOI
- 10.1109/TIA.2021.3084914
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > ELECTRICAL ENGINEERING(전자공학부) > Articles
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