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Bollullos de la Mitación, Spain

Munoz-Cruzado-Alba J.,GPTech | Rojas C.A.,Federico Santa Maria Technical University | Kouro S.,Federico Santa Maria Technical University | Diez E.G.,University of Seville
Energies | Year: 2016

Nowadays, an increasing penetration of utility-scale photovoltaic plants (USPVPs) leads to a change in dynamic and operational characteristics of the power distribution system. USPVPs must help to maintain the system stability and reliability while implementing minimum technical requirements (MTRs) imposed by the utility grid. One of the most significant requirements is about frequency regulation (FR). Overall production of USPVPs is reduced significantly by applying FR curves, especially in weak grids with high rate of frequency faults. The introduction of a battery energy storage system (BESS) reduces losses and improves the grid system reliability. Experimental frequency and irradiance data of several weak grids have been used to analyse USPVPs losses related to FR requirements and benefits from the introduction of a BESS. Moreover, its economic viability is showen without the need for any economic incentives. © 2016 by the authors. Source


Munoz-Cruzado-Alba J.,GPTech | Villegas-Nunez J.,GPTech | Vite-Frias J.A.,GPTech | Solis J.M.C.,University of Seville
Energies | Year: 2016

Power converters are the basic unit for the transient voltage fault ride through capability for most renewable distributed generators (DGs). When a transient fault happens, the grid voltage will drop suddenly and probably will also suffer a phase-jump event as well. State-of-the-art voltage fault control techniques regulate the current injected during the grid fault. However, the beginning of the fault could be too fast for the inner current control loops of the inverter, and transient over-current would be expected. In order to avoid the excessive peak current of the methods presented in the literature, a new fast peak current control (FPCC) technique is proposed. Controlling the peak current magnitude avoids undesirable disconnection of the distributed generator in a fault state and improves the life expectancy of the converter. Experimental and simulation tests with high power converters provide the detailed behaviour of the method with excellent results. © 2015 by the authors. Source


Munoz-Cruzado-Alba J.,GPTech | Villegas-Nunez J.,GPTech | Vite-Frias J.A.,GPTech | Galvan-Diez E.,University of Seville | Carrasco J.M.,University of Seville
2015 IEEE 15th International Conference on Environment and Electrical Engineering, EEEIC 2015 - Conference Proceedings | Year: 2015

Power converters are the basic unit for transient voltage fault ride through capability for most renewable distributed generators. When a transient fault happens, the grid voltage will drop suddenly, and probably, will also suffer a phase-jump event also. State of the art voltage fault control techniques regulate the current injected during the grid fault. However, the beginning of the fault could be too fast for the inner currents control loops of the inverter, and transient over-current would be expected. In order to avoid excessive peak current of methods presented in the literature, a new fast peak current control technique is proposed. Controlling the peak current magnitude avoids undesirable disconnection of the distributed generator in a fault state and improves the life-expectancy of the converter. Experimental and simulation tests with high power converters provide detailed behaviour of the method with excellent results. © 2015 IEEE. Source


Munoz-Cruzado-Alba J.,GPTech | Munoz-Cruzado-Alba J.,University of Seville | Villegas-Nunez J.,GPTech | Vite-Frias J.A.,GPTech | And 3 more authors.
IEEE Transactions on Industrial Electronics | Year: 2015

A new active Q-f droop anti-islanding (AI) algorithm is proposed. The method is based on frequency and reactive power cross-correlation measures. The proposed control technique is intended to fulfill recent and future grid code requirements. The algorithm looks for a zero nondetection zone, adding low disturbances, working with long frequency excursions and nondependence of the power factor setpoint. The method was verified using a set of simulation models developed in PSCAD environment. The tests show results for several quality factors and different active power levels. In addition, a comparative analysis against other AI methods is presented. Experimental and simulation tests provide further insight on the controllers performance under different working conditions, considering several quality factors and active power levels. Moreover, its performance is assessed comparing the proposed controller behavior against state-of-the-art AI methods. © 2015 IEEE. Source

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