Virtual model predictive control of the inverter to achieve unbalance compensation for islanded and grid‐tied operations

Autor: Zhenwei Li, Haoyu Li, Xuemei Zheng, Mengyou Gao, Yanxue Yu
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: IET Renewable Power Generation, Vol 16, Iss 10, Pp 2007-2019 (2022)
Druh dokumentu: article
ISSN: 1752-1424
1752-1416
06874207
DOI: 10.1049/rpg2.12480
Popis: Abstract Voltage unbalance is a frequent problem in the power system, and using renewable energy power generation devices to achieve unbalance compensation is a promising solution compared to adding additional equipment. Most of the existing unbalance compensation schemes for inverters are implemented based on cascaded linear controllers, which have obvious disadvantages of complex structure and cumbersome parameter adjustment process. In order to develop a simpler unbalance compensation scheme, this paper first derives the equivalent sequence network (ESN) model of the unbalanced three‐phase power system, and it reveals the important role of transmission line impedance in the unbalance problem. Inspired by the ESN model, an unbalance compensation scheme based on negative sequence virtual impedance (NSVI) is determined. Then the NSVI is embedded in the inverter mathematical model, and the virtual model predictive control (VMPC) of the inverter to achieve unbalance compensation is proposed. Finally, the proposed VMPC method is validated by experiments, and a comparative analysis is carried out with linear control methods. The development process and validation results show that, compared with the unbalance compensation scheme based on cascaded linear controllers, the VMPC method proposed in this paper has a simpler structure and stable performance.
Databáze: Directory of Open Access Journals
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