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

Sen Zhang, Jianfeng Zhao, Zhihong Zhao, Kangli Liu, Pengyu Wang and Bin Yang
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Sen Zhang: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Jianfeng Zhao: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Zhihong Zhao: Department of Electrical Engineering, School of Automation, Nanjing University of Science and Technology, Nanjing 210094, China
Kangli Liu: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Pengyu Wang: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Bin Yang: School of Electrical Engineering, Southeast University, Nanjing 210096, China

Energies, 2019, vol. 12, issue 12, 1-15

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) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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