A Decentralized Control Scheme for Grid-tied Cascaded-Type PV Inverter Systems

This article proposes a decentralized control strategy for single-phase cascaded-type photovoltaic (PV) inverter systems operating in grid-tied mode. In the proposed scheme, one PV unit functions as a controlled current source, while the others act as voltage sources. Decentralized frequency synchro...

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Published inIEEE journal of emerging and selected topics in industrial electronics (Print) Vol. 6; no. 1; pp. 184 - 195
Main Authors Li, Lang, Sun, Yao, Hou, Xiaochao, Fu, Siqi, Su, Mei
Format Journal Article
LanguageEnglish
Published New York IEEE 01.01.2025
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Capacitors
Cascaded-type photovoltaic (PV) inverter
Control methods
Control stability
Control systems
Current sources
Decentralized control
Electric potential
Frequency synchronization
Frequency variation
Hardware-in-the-loop simulation
Inverters
maximum power point tracking (MPPT)-based control
Maximum power tracking
Photovoltaic cells
Photovoltaic systems
Power transmission lines
Reactive power
Root locus
Voltage
Voltage control
Online AccessGet full text
ISSN2687-9735
2687-9743
DOI10.1109/JESTIE.2024.3402052

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Abstract This article proposes a decentralized control strategy for single-phase cascaded-type photovoltaic (PV) inverter systems operating in grid-tied mode. In the proposed scheme, one PV unit functions as a controlled current source, while the others act as voltage sources. Decentralized frequency synchronization is achieved, which is conducive to enhancing the system's reliability compared with the communication-based methods. In addition, the active power outputs for each PV unit, based on maximum power point tracking, are obtained. The proposed method exhibits a robust anti-disturbance capability, particularly under conditions of grid voltage amplitude and frequency variations. Furthermore, the stability of the proposed control is validated using the root locus method for grid-tied cascaded-type PV inverter systems. Finally, the performance and feasibility of the proposed decentralized control method have been validated by simulation and hardware-in-the-loop results.
AbstractList This article proposes a decentralized control strategy for single-phase cascaded-type photovoltaic (PV) inverter systems operating in grid-tied mode. In the proposed scheme, one PV unit functions as a controlled current source, while the others act as voltage sources. Decentralized frequency synchronization is achieved, which is conducive to enhancing the system's reliability compared with the communication-based methods. In addition, the active power outputs for each PV unit, based on maximum power point tracking, are obtained. The proposed method exhibits a robust anti-disturbance capability, particularly under conditions of grid voltage amplitude and frequency variations. Furthermore, the stability of the proposed control is validated using the root locus method for grid-tied cascaded-type PV inverter systems. Finally, the performance and feasibility of the proposed decentralized control method have been validated by simulation and hardware-in-the-loop results.
Author Fu, Siqi
Li, Lang
Sun, Yao
Su, Mei
Hou, Xiaochao
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SubjectTerms Capacitors
Cascaded-type photovoltaic (PV) inverter
Control methods
Control stability
Control systems
Current sources
Decentralized control
Electric potential
Frequency synchronization
Frequency variation
Hardware-in-the-loop simulation
Inverters
maximum power point tracking (MPPT)-based control
Maximum power tracking
Photovoltaic cells
Photovoltaic systems
Power transmission lines
Reactive power
Root locus
Voltage
Voltage control
Title A Decentralized Control Scheme for Grid-tied Cascaded-Type PV Inverter Systems
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Volume 6
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