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3 results on '"Dario Garozzo"'

1. Evaluation of the Effective Active Power Reserve for Fast Frequency Response of PV with BESS Inverters Considering Reactive Power Control

Author

Dario Garozzo and Giuseppe Marco Tina

Subjects
PV system, BESS, inverter efficiency, active power reserve, voltage regulation, frequency regulation, Technology
Abstract

The increasing presence of distributed generation (DG) in the electrical grid determines new challenges in grid operations, especially in terms of voltage and frequency regulation. Recently, several grid codes have required photovoltaic (PV) inverters to control their reactive power output in order to provide voltage regulation services, and the allocation of a certain amount of active power reserve for fast frequency response (FFR) service during under-frequency contingencies is needed. This requirement involves a significant waste of energy for PV systems, due to the necessity to constantly operate in de-loaded mode, under normal operating conditions. In addition, the variability of the irradiance can affect the correct amount of active power reserve that the system can provide in the moments after an under-frequency occurrence. The increasing number of battery energy storage systems (BESSs), coupled to PV systems, can be used to provide a worthy contribution to this frequency regulation service. The aim of this paper is to analyze the efficiency of active power reserve provided by a BESS connected to the DC bus of a non-ideal grid-connected PV inverter, taking into account the impact of reactive power control. For this purpose, the contribution of BESSs to frequency regulation is discussed and, starting from an existing model of real inverter, an analytical formulation for active power reserve evaluation is presented. Results concerning the impact of reactive power control are also given. Finally, the possibility for a low voltage (LV) grid with aggregated PV systems and BESSs to contribute to grid active power reserve is considered. Different voltage control strategies are compared, defining a helpful new parameter.

Published
2020
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2. Scheduling of PV inverter reactive power set-point and battery charge/discharge profile for voltage regulation in low voltage networks

Author

Giuseppe Marco Tina, Dario Garozzo, and Pierluigi Siano

Subjects
Reactive power control, Computer science, 020209 energy, 020208 electrical & electronic engineering, Photovoltaic system, Ancillary service, Storage, Energy Engineering and Power Technology, 02 engineering and technology, AC power, Photovoltaic inverter, Scheduling (computing), Electric power system, Voltage quality, 0202 electrical engineering, electronic engineering, information engineering, Electronic engineering, Inverter, Voltage regulation, Electrical and Electronic Engineering, Battery scheduling, Low voltage, Voltage
Abstract

In recent years, renewable energies and storage systems are bringing a significant contribution to power system. Due to the high penetration of non-predictable power sources, especially in the distribution networks, new challenges related to the integration and management of these new resources also combined with storage systems arose in power system research. Accordingly, the aim of this paper is to propose an innovative scheduling method for voltage regulation in low voltage networks. A simple type of contract for ancillary services that foresees the participation of active users endowed with a storage system coupled with a PV system is considered. The method allows to regulate the voltage in a distribution system by using a combined PV and storage system. The voltage regulation is achieved by setting the value of the inverter reactive power on the basis of sensitivity coefficients of the considered node, taking into account the capability curve constrains, as required by new grid codes. A possible tariff policy is also proposed for the ancillary service and for the operation of the realization of the scheduling algorithm. Simulation results demonstrate the effectiveness of the proposed method for the scheduling of the power system.

Published
2019
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3. Comparison of the reactive control strategies in low voltage network with photovoltaic generation and storage

Author

Dezso Sera, Dario Garozzo, and Giuseppe Marco Tina

Subjects
Reactive control, storage systems, Sustainability and the Environment, photovoltaic inverters, Renewable Energy, Sustainability and the Environment, Computer science, Pv generation, 020209 energy, lcsh:Mechanical engineering and machinery, 020208 electrical & electronic engineering, 02 engineering and technology, Automotive engineering, radial network, reactive power control, Inverter losses, Photovoltaic inverters, Radial network, Reactive power control, Storage systems, Voltage regulation, 0202 electrical engineering, electronic engineering, information engineering, voltage regulation, ComputerSystemsOrganization_SPECIAL-PURPOSEANDAPPLICATION-BASEDSYSTEMS, lcsh:TJ1-1570, Renewable Energy, PV inverters
Abstract

The aim of this study is to analyze the different decentralized voltage control strategies, based on the reactive power control of photovoltaic inverters. The study focuses on evaluating their impact in terms of reactive power demanded from the grid, due to the regulation, and active losses in the network and in the photovoltaic inverters. In a second step, the presence of battery energy storage systems in the network is considered and further analysis are performed, in order to take into account the overvoltage mitigation by peak shaving of the photovolta-ic generation. All the simulations are performed in MATLAB/SIMULINK, where the model of a single-phase low-voltage distribution network with distributed generation sources is implemented.

Published
2018
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