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Volume 12
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10.3390/en12122426
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Article

Decoupled Current Controller Based on Reduced Order Generalized Integrator for Three-Phase Grid-Connected VSCs in Distributed System

by
Sen Zhang
1,
Jianfeng Zhao
1,*,
Zhihong Zhao
2,
Kangli Liu
1,
Pengyu Wang
1 and
Bin Yang
1
1
School of Electrical Engineering, Southeast University, Nanjing 210096, China
2
Department of Electrical Engineering, School of Automation, Nanjing University of Science and Technology, Nanjing 210094, China
*
Author to whom correspondence should be addressed.
Energies 2019, 12(12), 2426; https://doi.org/10.3390/en12122426
Submission received: 13 May 2019 / Revised: 11 June 2019 / Accepted: 21 June 2019 / Published: 24 June 2019
(This article belongs to the Special Issue Design and Control of Power Converters 2019)
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Abstract

Grid-connected voltage source converters (GC-VSCs) are used for interfacing the distributed power generation system (DPGS) to the utility grid. Performance of the current loop is a critical issue for these GC-VSCs. Recently, reduced order generalized integrator (ROGI)-based current controller is proposed, such that AC reference signal of positive or negative sequences can be separately tracked without steady-state error, which has the advantage of less computational burden. However, the cross-coupling within the ROGI-based current controller would deteriorate the transient response of the current loop. In this paper, a ROGI-based decoupled current controller is proposed to eliminate the coupling between α -axis and β -axis. Thus, the faster dynamic response performance can be achieved while maintaining the merits of ROGI-based current controller. An optimal gain parameter design method for the proposed current controller is presented to improve the stability and dynamic response speed of current loop. Simulation and experiments were performed in MATLAB/Simulink and TMS320C28346 DSP-based laboratory prototype respectively, which validated the proposed theoretical approach.
Keywords: decoupling; reduced order generalized integrator (ROGI); optimal gain; distributed power generation system (DPGS); grid-connected voltage source converters (GC-VSCs) decoupling; reduced order generalized integrator (ROGI); optimal gain; distributed power generation system (DPGS); grid-connected voltage source converters (GC-VSCs)

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MDPI and ACS Style

Zhang, S.; Zhao, J.; Zhao, Z.; Liu, K.; Wang, P.; Yang, B. Decoupled Current Controller Based on Reduced Order Generalized Integrator for Three-Phase Grid-Connected VSCs in Distributed System. Energies 2019, 12, 2426. https://doi.org/10.3390/en12122426

AMA Style

Zhang S, Zhao J, Zhao Z, Liu K, Wang P, Yang B. Decoupled Current Controller Based on Reduced Order Generalized Integrator for Three-Phase Grid-Connected VSCs in Distributed System. Energies. 2019; 12(12):2426. https://doi.org/10.3390/en12122426

Chicago/Turabian Style

Zhang, Sen, Jianfeng Zhao, Zhihong Zhao, Kangli Liu, Pengyu Wang, and Bin Yang. 2019. "Decoupled Current Controller Based on Reduced Order Generalized Integrator for Three-Phase Grid-Connected VSCs in Distributed System" Energies 12, no. 12: 2426. https://doi.org/10.3390/en12122426

APA Style

Zhang, S., Zhao, J., Zhao, Z., Liu, K., Wang, P., & Yang, B. (2019). Decoupled Current Controller Based on Reduced Order Generalized Integrator for Three-Phase Grid-Connected VSCs in Distributed System. Energies, 12(12), 2426. https://doi.org/10.3390/en12122426

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