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http://dx.doi.org/10.6113/JPE.2016.16.3.1110

An Inductance Voltage Vector Control Strategy and Stability Study Based on Proportional Resonant Regulators under the Stationary αβ Frame for PWM Converters  

Sun, Qiang (School of Electrical Engineering and Automation, Tianjin University)
Wei, Kexin (Tianjin Key Laboratory of Control Theory & Applications in Complicated Systems, Tianjin University of Technology)
Gao, Chenghai (School of Electrical Engineering and Automation, Tianjin University)
Wang, Shasha (Research & Development Department, Tianjin EV Energies Co., Ltd.)
Liang, Bin (Tianjin Key Laboratory of Control Theory & Applications in Complicated Systems, Tianjin University of Technology)
Publication Information
Journal of Power Electronics / v.16, no.3, 2016 , pp. 1110-1121 More about this Journal
Abstract
The mathematical model of a three phase PWM converter under the stationary αβ reference frame is deduced and constructed based on a Proportional-Resonant (PR) regulator, which can replace trigonometric function calculation, Park transformation, real-time detection of a Phase Locked Loop and feed-forward decoupling with the proposed accurate calculation of the inductance voltage vector. To avoid the parallel resonance of the LCL topology, the active damping method of the proportional capacitor-current feedback is employed. As to current vector error elimination, an optimized PR controller of the inner current loop is proposed with the zero-pole matching (ZPM) and cancellation method to configure the regulator. The impacts on system's characteristics and stability margin caused by the PR controller and control parameter variations in the inner-current loop are analyzed, and the correlations among active damping feedback coefficient, sampling and transport delay, and system robustness have been established. An equivalent model of the inner current loop is studied via the pole-zero locus along with the pole placement method and frequency response characteristics. Then, the parameter values of the control system are chosen according to their decisive roles and performance indicators. Finally, simulation and experimental results obtained while adopting the proposed method illustrated its feasibility and effectiveness, and the inner current loop achieved zero static error tracking with a good dynamic response and steady-state performance.
Keywords
Active damping; Inductance voltage vector; Pole-zero matching; Proportional resonant regulator; Stability;
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