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Marroyo Palomo, Luis

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https://academica-e.unavarra.es/handle/2454/49511

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Marroyo Palomo

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Luis

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IngenierĆ­a ElĆ©ctrica, ElectrĆ³nica y de ComunicaciĆ³n

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ISC. Institute of Smart Cities

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0000-0002-8344-8374

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495

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2017 - 20192
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Subject: Photovoltaic Ɨ Subject: Converter control Ɨ Item Type: Publication Ɨ

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Now showing 1 - 2 of 2
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    PublicationOpen Access
    DC capacitance reduction in three-phase photovoltaic inverters by using virtual impedance emulation
    (IEEE, 2019) Urtasun Erburu, Andoni; Sanchis GĆŗrpide, Pablo; Marroyo Palomo, Luis; Ingeniaritza Elektrikoa, Elektronikoaren eta Telekomunikazio Ingeniaritzaren; Institute of Smart Cities - ISC; IngenierĆ­a ElĆ©ctrica, ElectrĆ³nica y de ComunicaciĆ³n
    DC voltage regulation in grid-connected three-phase PV inverters is a fundamental requirement. In order to reduce the influence of the PV non-linear behavior and ensure stability in the whole operating range, the input capacitance in high-power inverters is currently oversized, thus increasing the converter cost. This paper proposes a control method which emulates a virtual impedance in parallel with the PV generator, making it possible to reduce the capacitance by a factor of 5. Simulation results confirm that the proposed control is stable and fast enough in the whole operating range with such a small capacitor.
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    PublicationOpen Access
    On the stability criteria for inverter current control loops with LCL output filters and varying grid impedance
    (IEEE, 2017) Lumbreras MagallĆ³n, David; Barrios RĆ­podas, Ernesto; UrsĆŗa Rubio, Alfredo; Marroyo Palomo, Luis; Sanchis GĆŗrpide, Pablo; Ingeniaritza Elektrikoa eta Elektronikoa; Institute of Smart Cities - ISC; IngenierĆ­a ElĆ©ctrica y ElectrĆ³nica
    The use of LC and LCL filters and grid impedance variations are creating new challenges on the controller design for current control loops of photovoltaic and wind turbine inverters. In the design process, stability criteria such as Bode and revised Bode are commonly used. This paper analyses the limitations of Bode and revised Bode criteria to reliably determine stability and proposes a sufficient and necessary stability criterion, based on the Nyquist criterion, but that makes use of the Bode diagram. The proposed criterion, named generalized Bode criterion, is always reliable and helps the controller design. Relative stability in complex control loops is also studied and a relative stability analysis is proposed. Finally, the generalized Bode criterion and the proposed relative stability analysis are illustrated with a practical example in which a PI is designed in order to guarantee stability and achieve relative stability.