Efficient Improvement of Photovoltaic-Battery Systems in Standalone DC Microgrids Using a Local Hierarchical Control for the Battery System

Yun Yang; Yaxiao Qin; Siew Chong Tan; Shu Yuen Ron Hui

doi:10.1109/TPEL.2019.2900147

Efficient Improvement of Photovoltaic-Battery Systems in Standalone DC Microgrids Using a Local Hierarchical Control for the Battery System

Yun Yang
, Yaxiao Qin
, Siew Chong Tan
, Shu Yuen Ron Hui

The Hong Kong Polytechnic University

Research output: Journal article publication › Journal article › Academic research › peer-review

85 Citations (Scopus)

Abstract

The conventional control methods for the battery systems of photovoltaic (PV) battery systems in standalone dc microgrids are designed to stringently regulate the bus voltages at the maximum power points (MPP) of PV modules while the state of charge (SOC) of the battery packs is regulated within the tolerances. In this paper, a local hierarchical control (LHC) is proposed for the battery system to improve the energy efficiency of the entire PV-battery system at the MPP of PV modules while the SOC of the battery pack is still regulated within the tolerance. Specifically, by allowing the dc bus voltage to deviate within a preset allowable tolerance, the secondary control of the LHC is employed to compute real-time optimal references to its primary control, such that the energy conversion of the entire PV-battery system can be optimized. Simulation studies exhibit significant efficiency improvement of a 12-PV-battery system under both uniform and nonuniform insolation conditions on a cloudy day and a 600-kW PV-battery system on a sunny day using the proposed LHC. Experimental results validate that the energy efficiency of a single-PV-module-battery system controlled by the LHC can be enhanced using shortened sunny-day and cloudy-day irradiance profiles for various PV modules. The proposed control scheme can be easily implemented in digital controllers without additional hardware costs.

Original language	English
Article number	8643805
Pages (from-to)	10796-10807
Number of pages	12
Journal	IEEE Transactions on Power Electronics
Volume	34
Issue number	11
DOIs	https://doi.org/10.1109/TPEL.2019.2900147
Publication status	Published - Nov 2019

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Keywords

Local hierarchical control (LHC)
photovoltaic (PV) battery system
standalone dc microgrid

ASJC Scopus subject areas

Electrical and Electronic Engineering

More information

10.1109/TPEL.2019.2900147

Cite this

@article{8a251fdf0e4c491d9fb9fed4fb744406,

title = "Efficient Improvement of Photovoltaic-Battery Systems in Standalone DC Microgrids Using a Local Hierarchical Control for the Battery System",

abstract = "The conventional control methods for the battery systems of photovoltaic (PV) battery systems in standalone dc microgrids are designed to stringently regulate the bus voltages at the maximum power points (MPP) of PV modules while the state of charge (SOC) of the battery packs is regulated within the tolerances. In this paper, a local hierarchical control (LHC) is proposed for the battery system to improve the energy efficiency of the entire PV-battery system at the MPP of PV modules while the SOC of the battery pack is still regulated within the tolerance. Specifically, by allowing the dc bus voltage to deviate within a preset allowable tolerance, the secondary control of the LHC is employed to compute real-time optimal references to its primary control, such that the energy conversion of the entire PV-battery system can be optimized. Simulation studies exhibit significant efficiency improvement of a 12-PV-battery system under both uniform and nonuniform insolation conditions on a cloudy day and a 600-kW PV-battery system on a sunny day using the proposed LHC. Experimental results validate that the energy efficiency of a single-PV-module-battery system controlled by the LHC can be enhanced using shortened sunny-day and cloudy-day irradiance profiles for various PV modules. The proposed control scheme can be easily implemented in digital controllers without additional hardware costs.",

keywords = "Local hierarchical control (LHC), photovoltaic (PV) battery system, standalone dc microgrid",

author = "Yun Yang and Yaxiao Qin and Tan, \{Siew Chong\} and Hui, \{Shu Yuen Ron\}",

note = "Funding Information: Manuscript received November 3, 2018; revised January 9, 2019; accepted February 13, 2019. Date of publication February 18, 2019; date of current version August 29, 2019. This work was supported by Hong Kong Research Grant Council under the theme-based research Project T23-701/14-N. Recommended for publication by Associate Editor G. Oriti. (Corresponding author: Yun Yang.) Y. Yang, Y. Qin, and S.-C. Tan are with the Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong (e-mail:, [email protected]; [email protected]; [email protected]). Publisher Copyright: {\textcopyright} 1986-2012 IEEE. Copyright: Copyright 2019 Elsevier B.V., All rights reserved.",

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language = "English",

volume = "34",

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Efficient Improvement of Photovoltaic-Battery Systems in Standalone DC Microgrids Using a Local Hierarchical Control for the Battery System. / Yang, Yun; Qin, Yaxiao; Tan, Siew Chong et al.
In: IEEE Transactions on Power Electronics, Vol. 34, No. 11, 8643805, 11.2019, p. 10796-10807.

Research output: Journal article publication › Journal article › Academic research › peer-review

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AU - Yang, Yun

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AU - Hui, Shu Yuen Ron

N1 - Funding Information: Manuscript received November 3, 2018; revised January 9, 2019; accepted February 13, 2019. Date of publication February 18, 2019; date of current version August 29, 2019. This work was supported by Hong Kong Research Grant Council under the theme-based research Project T23-701/14-N. Recommended for publication by Associate Editor G. Oriti. (Corresponding author: Yun Yang.) Y. Yang, Y. Qin, and S.-C. Tan are with the Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong (e-mail:, [email protected]; [email protected]; [email protected]). Publisher Copyright: © 1986-2012 IEEE. Copyright: Copyright 2019 Elsevier B.V., All rights reserved.

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N2 - The conventional control methods for the battery systems of photovoltaic (PV) battery systems in standalone dc microgrids are designed to stringently regulate the bus voltages at the maximum power points (MPP) of PV modules while the state of charge (SOC) of the battery packs is regulated within the tolerances. In this paper, a local hierarchical control (LHC) is proposed for the battery system to improve the energy efficiency of the entire PV-battery system at the MPP of PV modules while the SOC of the battery pack is still regulated within the tolerance. Specifically, by allowing the dc bus voltage to deviate within a preset allowable tolerance, the secondary control of the LHC is employed to compute real-time optimal references to its primary control, such that the energy conversion of the entire PV-battery system can be optimized. Simulation studies exhibit significant efficiency improvement of a 12-PV-battery system under both uniform and nonuniform insolation conditions on a cloudy day and a 600-kW PV-battery system on a sunny day using the proposed LHC. Experimental results validate that the energy efficiency of a single-PV-module-battery system controlled by the LHC can be enhanced using shortened sunny-day and cloudy-day irradiance profiles for various PV modules. The proposed control scheme can be easily implemented in digital controllers without additional hardware costs.

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KW - standalone dc microgrid

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Efficient Improvement of Photovoltaic-Battery Systems in Standalone DC Microgrids Using a Local Hierarchical Control for the Battery System

Abstract

UN SDGs

Keywords

ASJC Scopus subject areas

More information

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