Tertiary and secondary control levels for efficiency optimization and system damping in droop controlled dc-dc converters

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Abstract

Droop control by means of virtual resistance (VR) control loops can be applied to paralleled dc-dc converters for achieving autonomous equal power sharing. However, equal power sharing does not guarantee an efficient operation of the whole system. In order to achieve higher efficiency and lower energy losses, this paper proposes a tertiary control level including an optimization method for achieving efficient operation. As the efficiency of each converter changes with the output power, VR values are set as decision variables for modifying the power sharing ratio among converters. Genetic algorithm is used in searching for a global efficiency optimum. In addition, a secondary control level is added to regulate the output voltage drooped by the VRs. However, system dynamics is affected when shifting up/down the VR references. Therefore, a secondary control for system damping is proposed and applied for maintaining system stability. Hardware-in-the-loop simulations are conducted to validate the effectiveness of this method. The results show that the system efficiency is improved by using tertiary optimization control and the desired transient response is ensured with system damping secondary control.
Original languageEnglish
JournalI E E E Transactions on Smart Grid
Volume6
Issue number6
Pages (from-to)2615 - 2626
Number of pages12
ISSN1949-3053
DOIs
Publication statusPublished - Nov 2015

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Level control
Damping
System stability
Transient analysis
Energy dissipation
Dynamical systems
Genetic algorithms
Hardware
Electric potential

Keywords

  • Tertiary control
  • Dc-dc converters
  • Hierarchical control
  • Droop method
  • System damping
  • Secondary control
  • Efficiency optimization

Cite this

@article{8df1317e5ca54235acf21e27a1927e63,
title = "Tertiary and secondary control levels for efficiency optimization and system damping in droop controlled dc-dc converters",
abstract = "Droop control by means of virtual resistance (VR) control loops can be applied to paralleled dc-dc converters for achieving autonomous equal power sharing. However, equal power sharing does not guarantee an efficient operation of the whole system. In order to achieve higher efficiency and lower energy losses, this paper proposes a tertiary control level including an optimization method for achieving efficient operation. As the efficiency of each converter changes with the output power, VR values are set as decision variables for modifying the power sharing ratio among converters. Genetic algorithm is used in searching for a global efficiency optimum. In addition, a secondary control level is added to regulate the output voltage drooped by the VRs. However, system dynamics is affected when shifting up/down the VR references. Therefore, a secondary control for system damping is proposed and applied for maintaining system stability. Hardware-in-the-loop simulations are conducted to validate the effectiveness of this method. The results show that the system efficiency is improved by using tertiary optimization control and the desired transient response is ensured with system damping secondary control.",
keywords = "Tertiary control , Dc-dc converters, Hierarchical control, Droop method, System damping, Secondary control, Efficiency optimization",
author = "Lexuan Meng and Tomislav Dragicevic and Quintero, {Juan Carlos Vasquez} and Guerrero, {Josep M.}",
year = "2015",
month = "11",
doi = "10.1109/TSG.2015.2435055",
language = "English",
volume = "6",
pages = "2615 -- 2626",
journal = "I E E E Transactions on Smart Grid",
issn = "1949-3053",
publisher = "IEEE",
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TY - JOUR

T1 - Tertiary and secondary control levels for efficiency optimization and system damping in droop controlled dc-dc converters

AU - Meng, Lexuan

AU - Dragicevic, Tomislav

AU - Quintero, Juan Carlos Vasquez

AU - Guerrero, Josep M.

PY - 2015/11

Y1 - 2015/11

N2 - Droop control by means of virtual resistance (VR) control loops can be applied to paralleled dc-dc converters for achieving autonomous equal power sharing. However, equal power sharing does not guarantee an efficient operation of the whole system. In order to achieve higher efficiency and lower energy losses, this paper proposes a tertiary control level including an optimization method for achieving efficient operation. As the efficiency of each converter changes with the output power, VR values are set as decision variables for modifying the power sharing ratio among converters. Genetic algorithm is used in searching for a global efficiency optimum. In addition, a secondary control level is added to regulate the output voltage drooped by the VRs. However, system dynamics is affected when shifting up/down the VR references. Therefore, a secondary control for system damping is proposed and applied for maintaining system stability. Hardware-in-the-loop simulations are conducted to validate the effectiveness of this method. The results show that the system efficiency is improved by using tertiary optimization control and the desired transient response is ensured with system damping secondary control.

AB - Droop control by means of virtual resistance (VR) control loops can be applied to paralleled dc-dc converters for achieving autonomous equal power sharing. However, equal power sharing does not guarantee an efficient operation of the whole system. In order to achieve higher efficiency and lower energy losses, this paper proposes a tertiary control level including an optimization method for achieving efficient operation. As the efficiency of each converter changes with the output power, VR values are set as decision variables for modifying the power sharing ratio among converters. Genetic algorithm is used in searching for a global efficiency optimum. In addition, a secondary control level is added to regulate the output voltage drooped by the VRs. However, system dynamics is affected when shifting up/down the VR references. Therefore, a secondary control for system damping is proposed and applied for maintaining system stability. Hardware-in-the-loop simulations are conducted to validate the effectiveness of this method. The results show that the system efficiency is improved by using tertiary optimization control and the desired transient response is ensured with system damping secondary control.

KW - Tertiary control

KW - Dc-dc converters

KW - Hierarchical control

KW - Droop method

KW - System damping

KW - Secondary control

KW - Efficiency optimization

U2 - 10.1109/TSG.2015.2435055

DO - 10.1109/TSG.2015.2435055

M3 - Journal article

VL - 6

SP - 2615

EP - 2626

JO - I E E E Transactions on Smart Grid

JF - I E E E Transactions on Smart Grid

SN - 1949-3053

IS - 6

ER -