A solar power generation system comprising: a DC to AC converter coupled to a photovoltaic, PV, module and for supplying power to an AC power network ; a control system comprising; a frequency monitor to obtain a network frequency from the power network; an internal reference frame element to provide an internal reference frequency of the solar power generation system; a frequency comparator to compare the network frequency and the internal reference frequency; a command signal generator to use the frequency comparison to determine whether a transient increase or decrease in commanded output power is warranted and to provide a command signal; and a power point tracker operable to extract either maximum power available from the PV module or less than maximum power available from the PV module; wherein the DC to AC converter is coupled to the power network along a power line , wherein the solar power generation system further comprises an energy storage unit coupled to the power line through an additional power converter , the additional power converter comprising an additional DC to AC converter , wherein the control system is further configured for providing switching commands to the additional power converter to obtain energy from or supply energy to the energy storage unit when needed to support frequency stabilization of the power network, and wherein the power point tracker is operable to form a shape of a momentarily increased or decreased power delivered by the solar power generation system above or below a nominal value during transient conditions for the purpose of damping frequency oscillations either with or without using energy stored in the energy storage unit . a DC to AC converter coupled to a photovoltaic, PV, module and for supplying power to an AC power network ; a control system comprising; a frequency monitor to obtain a network frequency from the power network; an internal reference frame element to provide an internal reference frequency of the solar power generation system; a frequency comparator to compare the network frequency and the internal reference frequency; a command signal generator to use the frequency comparison to determine whether a transient increase or decrease in commanded output power is warranted and to provide a command signal; and a power point tracker operable to extract either maximum power available from the PV module or less than maximum power available from the PV module; wherein the DC to AC converter is coupled to the power network along a power line , wherein the solar power generation system further comprises an energy storage unit coupled to the power line through an additional power converter , the additional power converter comprising an additional DC to AC converter , wherein the control system is further configured for providing switching commands to the additional power converter to obtain energy from or supply energy to the energy storage unit when needed to support frequency stabilization of the power network, and wherein the power point tracker is operable to form a shape of a momentarily increased or decreased power delivered by the solar power generation system above or below a nominal value during transient conditions for the purpose of damping frequency oscillations either with or without using energy stored in the energy storage unit . <EOS>