Control system and method for a renewable power plant

A control system for a power plant supplying electrical energy to a utility grid, the power plant comprising a wind farm with at least one wind turbine and a load system with at least one load, each load being configured to consume and transform energy provided from the wind farm or the utility grid at each point of time, the control system comprising:

• a frequency response system for obtaining a grid frequency as at least one electrical property data of the utility grid as input in order to determine a frequency drop, the frequency response system being further configured for a comparison of the obtained electrical property data with respective reference values comprising a frequency and generating a control signal in dependence of the comparison,
• wherein
• the load system is configured to reduce its power consumption during a recovery period of the at least one wind turbine, the recovery period immediately following an inertial response of the at least one wind turbine, where the control signal comprises time-dependent setpoints for dynamically controlling the energy consumption of the load system with a predetermined reduced energy consumption in comparison to the energy consumption prior to the inertial response,
• wherein in that
• the control signal is generated by the frequency response system in dependence of the comparison indicating start of the inertial response of the wind farm.

A control method for a power plant system supplying electrical energy to a utility grid, the power plant comprising a wind farm with at least one wind turbine and a load system with at least one load, each load being configured to consume and transform energy provided from the wind farm or the utility grid at each point of time, wherein

• a) a frequency response system management system obtains at least one electrical property data of the utility grid as input, the electrical property data being a grid frequency,
• b) the frequency response system is comparing the obtained electrical property data with respective reference values and is then generating a control signal in dependence of the comparison indicating start of the inertial response of the wind farm, the respective reference values comprising a frequency, and
• c) the load system reduces its power consumption during a recovery period of the at least one wind turbine, the recovery period immediately following the inertial response of the at least one wind turbine, and
• d) the control signal comprises time-dependent setpoints for dynamically controlling the energy consumption of the load system with a predetermined reduced energy consumption in comparison to the energy consumption prior to the inertial response in order to achieve a steady amount of energy supplied to the utility grid as soon as the recovery period has started.