Unbalance Compensation for PV-Dominated 3P-4W Distribution Networks

Three-phase four-wire low-voltage distribution networks exhibit unbalance issues due to arbitrarily connected devices. Owing to current limiting in three phases and neutral line, as well as limited measurement and communication links, unbalance compensation is challenging. This paper presents a hier...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2024-06, Vol.39 (3), p.1983-1996
Main Authors: Feng, Qifan, Xia, Yanghong, Yang, Pengcheng, Wei, Wei
Format: Article
Language:English
Subjects:
Communication
Compensation
Control methods
current limiting
Current measurement
Decentralized control
Distribution network
Distribution networks
Electric potential
Inverters
Networks
photovoltaic(PV)
Power distribution networks
Reliability
Substations
three-phase four-wire inverter
Transformers
Unbalance
unbalanced compensation
Voltage
Voltage control
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Summary:Three-phase four-wire low-voltage distribution networks exhibit unbalance issues due to arbitrarily connected devices. Owing to current limiting in three phases and neutral line, as well as limited measurement and communication links, unbalance compensation is challenging. This paper presents a hierarchical unbalance compensation control strategy using PV inverters for 3P-4W low-voltage distribution networks, which consists of two tactics based on the variation of communication conditions, namely decentralized and distributed control. The decentralized control is the optimal unbalanced current compensation for local or downstream load, which is designed decentralized and appropriate for PV inverters with only local measurement. The distributed control is the unbalanced current compensation at substation transformer, which can be implemented by means of executing compensation instructions by PV inverters with a low bandwidth one-way communication to the transformer. By accurately calculating the injected negative and zero sequence currents of PV inverters, unbalance compensation can be achieved considering the complex current and power constrains of PV arrays. The effectiveness of the proposed control method is valid by hardware-in-loop tests.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2024.3386567