Simplified Controller Design Method for Digitally Controlled LCL-Type PWM Converter with Multi-resonant Quasi-PR Controller and Capacitor-Current-Feedback Active Damping


Vol. 14, No. 6, pp. 1322-1333, Nov. 2014
10.6113/JPE.2014.14.6.1322


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 Abstract

To track the sinusoidal current under stationary frame and suppress the effects of low-order grid harmonics, the multi-resonantquasi-proportional plus resonant (PR) controller has been extensively used for digitally controlled LCL-type pulse-width modulation(PWM) converters with capacitor?current?feedback active damping. However, designing the controller is difficult because of its highorder and large number of parameters. Moreover, the computation and PWM delays of the digitally controlled system significantlyaffect damping performance. In this study, the delay effect is analyzed by using the Nyquist diagrams and the system stabilityconstraint condition can be obtained based on the Nyquist stability criterion. Moreover, impact analysis of the control parameters onthe current loop performance, that is, steady-state error and stability margin, identifies that different control parameters play differentdecisive roles in current loop performance. Based on the analysis, a simplified controller design method based on the systemspecifications is proposed. Following the method, two design examples are given, and the experimental results verify the practicabilityand feasibility of the proposed design method.


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Cite this article

[IEEE Style]

Y. Lyu and H. Lin, "Simplified Controller Design Method for Digitally Controlled LCL-Type PWM Converter with Multi-resonant Quasi-PR Controller and Capacitor-Current-Feedback Active Damping," Journal of Power Electronics, vol. 14, no. 6, pp. 1322-1333, 2014. DOI: 10.6113/JPE.2014.14.6.1322.

[ACM Style]

Yongcan Lyu and Hua Lin. 2014. Simplified Controller Design Method for Digitally Controlled LCL-Type PWM Converter with Multi-resonant Quasi-PR Controller and Capacitor-Current-Feedback Active Damping. Journal of Power Electronics, 14, 6, (2014), 1322-1333. DOI: 10.6113/JPE.2014.14.6.1322.