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Increasing the operating area of shunt active filters by advanced nonlinear control

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Abstract

This work is aimed to rigorously manage voltage saturation and maximum current constraints in Shunt Active Filters. In thisrespect, assuming “unconstrained” control algorithms have already been defined to achieve standard objectives for such devices(i.e. current tracking for harmonic compensation and DC-bus voltage boundness), a plug-in unit, oriented to extend the systemoperating region and at the same time preserving good performance under large transients and overload conditions, is presented.This solution allows to improve availability, robustness and composability of Shunt Active Filters, which are expected to be keyfeatures in present and next generation complex and possibly “smart” power grids. The proposed unit is composed by two parts.First, a suitable anti-windup strategy is defined in order to deal with control input saturation. Its main purpose is to preserve theoriginal “unconstrained error dynamics”, in face of input saturation, while guaranteeing low computational burden and reducedperformance impairment (the latter goal, in harmonic compensation context, leads to rather non-standard problem formulation).To this aim, the anti-windup acts on the current references through a suitably-designed additional dynamics. Then, in order to copewith current limitations, an additional strategy has been designed; again the current references is suitably shaped to comply withthe features and bounds of the system, augmented with the above-mentioned anti-windup solution. The proposed scheme can besimply joined to any kind of unconstrained controller adopted to steer Shunt Active Filters. In this work, an Internal-Model-basedcurrent controller is adopted as a benchmark case. The proposed approach is validate through extensive simulation tests.

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Authors and Affiliations

  1. Center of Complex Automated Systems (CASY) at Department of Electrical, Electronic and Information Engineering (DEI), University of Bologna, Viale Risorgimento 2, 40136, Bologna, Italy

    Andrea Tilli & Christian Conficoni

Authors
  1. Andrea Tilli
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  2. Christian Conficoni
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Corresponding author

Correspondence to Christian Conficoni.

Additional information

Andrea TILLI is an associate professor at the Department of Electrical, Electronic and Information Engineering “Guglielmo Marconi”(DEI) of the University of Bologna. In 2000, he received the Ph.D. degree in System Science and Engineering from the same university. He is a member of the Center for Research on Complex Automated Systems“Giuseppe Evangelisti” (CASY), established within DEI. His current research interests include applied nonlinear control techniques, active power filters, wind turbines, electric drives for motion control and energy generation, thermal control of many-core systems-on-chip and super computers.

Christian CONFICONI received the Master’sdegree in Electronic Engineering, from the University of Bologna, Italy in 2008. In 2013, he received the Ph.D. degree in AutomaticControl, from the same institution. Currently he is a post doctoral researcher at the Department of Electrical, Electronic and Information Engineering (DEI), at Universityof Bologna. His research interests include applied nonlinear control solutions for power electronic and electromechanical systems oriented to power quality enhancement, adaptive observers for electric drives sensorless operation, modeling andenergy-oriented optimal thermal management of advanced computing platforms.

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Tilli, A., Conficoni, C. Increasing the operating area of shunt active filters by advanced nonlinear control. Control Theory Technol. 13, 115–140 (2015). https://doi.org/10.1007/s11768-015-4122-6

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  • DOI: https://doi.org/10.1007/s11768-015-4122-6

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