A photovoltaic power plant comprising: a plurality of slave plant controllers and a master plant controller; wherein the master plant controller is configured to send a global setpoint based on an output of the photovoltaic power plant at point of interconnection of the photovoltaic power plant; the plurality of slave plant controllers are configured to receive the global setpoint from the master plant controller; each slave plant controller in the plurality of slave plant controllers is configured to reduce or increase the global setpoint so as to adjust an individual setpoint for each of a plurality of photovoltaic inverters controlled by the slave plant controller, the individual setpoint setting an output of a corresponding photovoltaic inverter in the plurality of photovoltaic inverters provided to the point of interconnection of the photovoltaic power plant to a utility power grid; each of the plurality of photovoltaic inverters is configured to convert direct current generated by a plurality of solar cells to alternating current; the master plant controller is configured to control the plurality of slave plant controllers; and the master plant controller is configured to detect the output of the photovoltaic power plant at the point of interconnection to the utility power grid, and to control the plurality of slave plant controllers to adjust individual setpoints of corresponding photovoltaic inverters based on the detected output of the photovoltaic power plant at the point of interconnection to the utility power grid by providing the global setpoint to the plurality of slave plant controllers. a plurality of slave plant controllers and a master plant controller; wherein the master plant controller is configured to send a global setpoint based on an output of the photovoltaic power plant at point of interconnection of the photovoltaic power plant; the plurality of slave plant controllers are configured to receive the global setpoint from the master plant controller; each slave plant controller in the plurality of slave plant controllers is configured to reduce or increase the global setpoint so as to adjust an individual setpoint for each of a plurality of photovoltaic inverters controlled by the slave plant controller, the individual setpoint setting an output of a corresponding photovoltaic inverter in the plurality of photovoltaic inverters provided to the point of interconnection of the photovoltaic power plant to a utility power grid; each of the plurality of photovoltaic inverters is configured to convert direct current generated by a plurality of solar cells to alternating current; the master plant controller is configured to control the plurality of slave plant controllers; and the master plant controller is configured to detect the output of the photovoltaic power plant at the point of interconnection to the utility power grid, and to control the plurality of slave plant controllers to adjust individual setpoints of corresponding photovoltaic inverters based on the detected output of the photovoltaic power plant at the point of interconnection to the utility power grid by providing the global setpoint to the plurality of slave plant controllers.