Enhanced Control for Improving the Operation of Grid-Connected Power Converters under Faulty and Saturated Conditions

Mahdi Shahparasti, Pedro Catalán, Nurul Fazlin Roslan, Joan Rocabert, Raúl-Santiago Muñoz-Aguilar and Alvaro Luna
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Mahdi Shahparasti: Department of Electrical Engineering, Technical University of Catalonia, 08222 Barcelona, Spain
Pedro Catalán: Ingeteam Power Technology, Parque Tecnológico de Bizkaia, Edificio 110, 48170 Zamudio, Spain
Nurul Fazlin Roslan: Department of Electrical Engineering, Technical University of Catalonia, 08222 Barcelona, Spain
Joan Rocabert: Department of Electrical Engineering, Technical University of Catalonia, 08222 Barcelona, Spain
Raúl-Santiago Muñoz-Aguilar: Department of Electrical Engineering, Technical University of Catalonia, 08222 Barcelona, Spain
Alvaro Luna: Department of Electrical Engineering, Technical University of Catalonia, 08222 Barcelona, Spain

Energies, 2018, vol. 11, issue 3, 1-21

Abstract: In renewable energy based systems Grid-Connected Voltage Source Converters (GC-VSC) are used in many applications as grid-feeding converters, which transfer the power coming from the renewable energy sources to the grid. In some cases, the operation of GC-VSC may become unstable or uncontrollable due to, among others: a grid fault or an inappropriate current-power reference, that give rise to fast electrical transients or a saturation of the controller. In this paper, an improved control scheme is proposed to enhance the controllability of GC-VSC in all these situations. This solution consists of two parts, on the one hand a new Proportional-Resonant (PR) controller with anti-windup capability to be used as current controller, and secondly a new current/power reference modifier, which defines the suitable reactive current/power reference to keep the system stable. It is worth to mention that the proposed scheme does not need information about the grid parameters as it only uses the converter current, and the voltage at the capacitors of Inductor-Capacitor (LC) output filter.

Keywords: current control; current reference generation; Low Voltage Ride Through (LVRT); grid connected voltage source converter; renewable resource; Proportional-Resonant (PR) controller (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: 2018
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