  This paper discusses emerging operational challenges associated with the
integration of solar photovoltaic (PV) in the All-Island power system (AIPS) of
Ireland and Northern Ireland. These include the impact of solar PV on: (i)
dispatch down levels; (ii) long-term frequency deviations; (iii) voltage
magnitude variations; and (iv) operational demand variations. A case study
based on actual data from the AIPS is used to analyze the above challenges. It
is shown that despite its (still) relatively low penetration compared to wind
power penetration, solar PV is challenging the real-time operation of the AIPS,
e.g., maintaining frequency within operational limits. EirGrid and SONI, the
transmission system operators (TSOs) of the AIPS, are working toward addressing
all the above challenges.
