Abstract
By the year 2023, the Tunisian power transmission grid has been projected to include photovoltaic pool of power of 937 MW, scattered throughout the whole landscape of the nation. This paper investigates high photovoltaic energy penetration impacts voltage regulation and dynamic performance of the grid. Load flow analysis is implemented to investigate the power system capability for the case of incorporating the desired photovoltaic power. Computer-based simulations have been used for evaluating the upgradation of the grid. Moreover, the study is based on bifurcation diagrams taking the photovoltaic generation as a bifurcation parameter and time response simulations to grid disturbances. Professional PSAT simulation toolbox has been used for the power flow simulation studies. Network- related faults like outage of photovoltaic farm event, three-phase short-circuit at a conventional bus, and voltage dip at the largest photovoltaic station have been considered. It is hoped that the results of the presented study would benefit Tunisian’s utility’s policies on integration of PV systems. Moreover, this comprehensive analysis and study will be a valuable guide for assessing and improving the performance of national grid systems of any other countries also, that gives the huge potential and need for solar energy penetration into the grid systems.
Highlights
A days, Renewable Energy Sources (RES) has become a significantly propitious aspect in the domain of energy systems globally and many nations are building policies and regulations for it
To fulfill the above-mentioned objectives, this paper presents an extensive review of fault ride through in the Tunisian grid code (GC) with a prominence on solar energy sources including low-voltage ride through and high-voltage ride through (HVRT)
Investigation of voltage stability demonstrates that the dynamic comportment of the voltage depends strangely on short circuit capability of the transmission network at the bus of integration with the PV station
Summary
Renewable Energy Sources (RES) has become a significantly propitious aspect in the domain of energy systems globally and many nations are building policies and regulations for it. Since the presented stability study has not considered the integration of PV systems with the power grid and its effect on the grid variables, the effect of integrating small PV plants on the performance and stability of the Tunisian radial distribution networks has been introduced in (Saıdi et al, 2014; 2016) With this beginning, increased complexity and changing structure of the Tunisian power system, more analysis is necessary for evaluating voltage and frequency stability along with determining the requirements to interconnect new large-scale SPVGPs with the Tunisian National grid. The presented paper is as a part of a planned project and based on the study to evaluate the impact of integration with increasing level of renewable energy generation obtained from SPVGPs on performance of national grid. Each synchronous generator is fitted with an Automatic Voltage Regulator and a Turbine
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