Three-phase AC-AC hexagonal chopper system with heterodyne modulation for power flow control enhancement

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Abstract

This paper proposes a three-phase AC chopper system for the interconnection of various distributed generation (DG) farms or main utilities to enhance the active and reactive power flow control. The absence of large energy storage component in direct AC-AC converter makes the system footprint small and reliable. As the interface for different AC sources, the presented converter can be configured as star or delta. However, delta connection is preferred as it can trap the potential zero-sequence current and reduce the current rating of the switching devices. In this way, the proposed converter resembles the hexagonal chopper, and it offers an inherent degree of freedom for output voltage phase-shifting. Considering the scalability in high voltage applications, a new version of the hexagonal chopper with half-bridge cell modular multilevel structure is developed. The modular multilevel AC hexagonal chopper (M2AHC) is operated in quasi-2-level mode to suppress the electro-magnetic interference (EMI) caused by high voltage switching. Quasi-2-level operation divides the voltage level transition into multi-steps, diminishing the voltage rising and falling rates (dv/dt) in high voltage condition. Then, heterodyne modulation is adopted for the presented chopper system, supplying a new degree of freedom to decouple the phase and amplitude regulation. Based on this idea, system control strategy is developed in synchronous reference frame (SRF). Simulations and experimentations have confirmed the validity of the proposed approaches.
LanguageEnglish
Pages5508-5521
Number of pages14
JournalIEEE Transactions on Power Electronics
Volume30
Issue number10
Early online date4 Dec 2014
DOIs
Publication statusPublished - 1 Oct 2015

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Flow control
Power control
Modulation
Electric potential
Distributed power generation
Signal interference
Reactive power
Energy storage
Farms
Stars
Scalability
Control systems

Keywords

  • three-phase
  • SRF
  • heterodyne modulation
  • quasi-two-level mode
  • M2AHC
  • hexagonal chopper
  • utility
  • AC-AC conversion

Cite this

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title = "Three-phase AC-AC hexagonal chopper system with heterodyne modulation for power flow control enhancement",
abstract = "This paper proposes a three-phase AC chopper system for the interconnection of various distributed generation (DG) farms or main utilities to enhance the active and reactive power flow control. The absence of large energy storage component in direct AC-AC converter makes the system footprint small and reliable. As the interface for different AC sources, the presented converter can be configured as star or delta. However, delta connection is preferred as it can trap the potential zero-sequence current and reduce the current rating of the switching devices. In this way, the proposed converter resembles the hexagonal chopper, and it offers an inherent degree of freedom for output voltage phase-shifting. Considering the scalability in high voltage applications, a new version of the hexagonal chopper with half-bridge cell modular multilevel structure is developed. The modular multilevel AC hexagonal chopper (M2AHC) is operated in quasi-2-level mode to suppress the electro-magnetic interference (EMI) caused by high voltage switching. Quasi-2-level operation divides the voltage level transition into multi-steps, diminishing the voltage rising and falling rates (dv/dt) in high voltage condition. Then, heterodyne modulation is adopted for the presented chopper system, supplying a new degree of freedom to decouple the phase and amplitude regulation. Based on this idea, system control strategy is developed in synchronous reference frame (SRF). Simulations and experimentations have confirmed the validity of the proposed approaches.",
keywords = "three-phase, SRF, heterodyne modulation, quasi-two-level mode, M2AHC, hexagonal chopper, utility, AC-AC conversion",
author = "Peng Li and Yachao Wang and Adam, {Grain Philip} and Derrick Holliday and Williams, {Barry W.}",
note = "(c) 2014 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.",
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AU - Li, Peng

AU - Wang, Yachao

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AU - Holliday, Derrick

AU - Williams, Barry W.

N1 - (c) 2014 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.

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Y1 - 2015/10/1

N2 - This paper proposes a three-phase AC chopper system for the interconnection of various distributed generation (DG) farms or main utilities to enhance the active and reactive power flow control. The absence of large energy storage component in direct AC-AC converter makes the system footprint small and reliable. As the interface for different AC sources, the presented converter can be configured as star or delta. However, delta connection is preferred as it can trap the potential zero-sequence current and reduce the current rating of the switching devices. In this way, the proposed converter resembles the hexagonal chopper, and it offers an inherent degree of freedom for output voltage phase-shifting. Considering the scalability in high voltage applications, a new version of the hexagonal chopper with half-bridge cell modular multilevel structure is developed. The modular multilevel AC hexagonal chopper (M2AHC) is operated in quasi-2-level mode to suppress the electro-magnetic interference (EMI) caused by high voltage switching. Quasi-2-level operation divides the voltage level transition into multi-steps, diminishing the voltage rising and falling rates (dv/dt) in high voltage condition. Then, heterodyne modulation is adopted for the presented chopper system, supplying a new degree of freedom to decouple the phase and amplitude regulation. Based on this idea, system control strategy is developed in synchronous reference frame (SRF). Simulations and experimentations have confirmed the validity of the proposed approaches.

AB - This paper proposes a three-phase AC chopper system for the interconnection of various distributed generation (DG) farms or main utilities to enhance the active and reactive power flow control. The absence of large energy storage component in direct AC-AC converter makes the system footprint small and reliable. As the interface for different AC sources, the presented converter can be configured as star or delta. However, delta connection is preferred as it can trap the potential zero-sequence current and reduce the current rating of the switching devices. In this way, the proposed converter resembles the hexagonal chopper, and it offers an inherent degree of freedom for output voltage phase-shifting. Considering the scalability in high voltage applications, a new version of the hexagonal chopper with half-bridge cell modular multilevel structure is developed. The modular multilevel AC hexagonal chopper (M2AHC) is operated in quasi-2-level mode to suppress the electro-magnetic interference (EMI) caused by high voltage switching. Quasi-2-level operation divides the voltage level transition into multi-steps, diminishing the voltage rising and falling rates (dv/dt) in high voltage condition. Then, heterodyne modulation is adopted for the presented chopper system, supplying a new degree of freedom to decouple the phase and amplitude regulation. Based on this idea, system control strategy is developed in synchronous reference frame (SRF). Simulations and experimentations have confirmed the validity of the proposed approaches.

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