Abstract
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.
Highlights
An increasing penetration of utility-scale photovoltaic plants (USPVPs) in the overall electric system requires the maintenance of their system stability and reliability
This paper shows some real cases where the installation of a battery energy storage system (BESS) is justified without any need for economic incentives, and reduces the installation price kWh
USPVPs studied in Section 3 have been selected to perform an analysis about frequency regulation (FR) production losses
Summary
An increasing penetration of utility-scale photovoltaic plants (USPVPs) in the overall electric system requires the maintenance of their system stability and reliability. The required actions are divided into three categories depending on the time scale of grid operation [1]. The faster technique (sub-seconds to minutes time scale) is related to the photovoltaic (PV) plant response to grid disturbances on the point of common coupling (PCC). The second is related to load balancing which is of the order of sub-hours to days, and is controlled by the utility-grid. The third action is about future electric systems designing (order of years). USPVPs on each of these categories have a different role and should be studied
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