A control system for renewable energy power generation equipment, which is configured to control renewable energy power generation equipment which includes a plurality of power generation devices generating power by using renewable energy sources and in which the plurality of power generation devices are operated by being connected to a power grid, the control system comprising: a measuring unit that is configured to measure a frequency of the power grid; a measuring unit that is configured to measure meteorological characteristics of the renewable energy power generation equipment; a calculating unit that is configured to calculate frequency deviation of the power grid; the control system characterized in further comprising: a calculating unit that is configured to calculate an expected power output of the renewable energy power generation equipment based on the meteorological characteristics measured by the measuring unit and to calculate an increase and decrease state value thereof based on the meteorological characteristics measured by the measuring unit that is configured to measure meteorological characteristics of the renewable energy power generation equipment; a calculating unit that is configured to calculate a correlation coefficient between the frequency deviation of the power grid and the expected power output of the renewable energy power generation equipment; and a determining unit that is configured to determine whether or not output adjustment of the renewable energy power generation equipment is necessary by using the correlation coefficient between the frequency deviation and the expected power output, and the increase and decrease state value of the expected power output; wherein the control system is configured such that an output of the renewable energy power generation equipment is restricted in case the determining unit determines that the output adjustment of the renewable energy power generation equipment is necessary, when the frequency deviation exceeds a predetermined positive threshold value, the correlation coefficient exceeds a positive threshold value, and the expected power output is in an increasing state, and the control system is further configured such that when the frequency deviation is lower than a predetermined negative threshold value, output restriction of the renewable energy power generation equipment is released. a measuring unit that is configured to measure a frequency of the power grid; a measuring unit that is configured to measure meteorological characteristics of the renewable energy power generation equipment; a calculating unit that is configured to calculate frequency deviation of the power grid; a calculating unit that is configured to calculate an expected power output of the renewable energy power generation equipment based on the meteorological characteristics measured by the measuring unit and to calculate an increase and decrease state value thereof based on the meteorological characteristics measured by the measuring unit that is configured to measure meteorological characteristics of the renewable energy power generation equipment; a calculating unit that is configured to calculate a correlation coefficient between the frequency deviation of the power grid and the expected power output of the renewable energy power generation equipment; and a determining unit that is configured to determine whether or not output adjustment of the renewable energy power generation equipment is necessary by using the correlation coefficient between the frequency deviation and the expected power output, and the increase and decrease state value of the expected power output; wherein the control system is configured such that an output of the renewable energy power generation equipment is restricted in case the determining unit determines that the output adjustment of the renewable energy power generation equipment is necessary, when the frequency deviation exceeds a predetermined positive threshold value, the correlation coefficient exceeds a positive threshold value, and the expected power output is in an increasing state, and the control system is further configured such that when the frequency deviation is lower than a predetermined negative threshold value, output restriction of the renewable energy power generation equipment is released.