A method of operating a windfarm connected to an electric grid via a point of injection for injecting power from the windfarm to the electric grid, the windfarm including at least two generating units and a windfarm controller, the method comprising: measuring a voltage and/or frequency characteristics of an electrical signal of the electric grid at the point of injection; communicating to at least two generating units of the at least two generating units of the windfarm at least one control signal based at least in part on the measured voltage and/or frequency characteristics of the electrical signal of the electric grid at the point of injection, the at least one control signal being indicative of a grid situation at the point of injection; and, controlling the at least two generating units of the at least two generating units of the windfarm at least in part based on the communicated at least one control signal; and wherein the at least one control signal is configured to communicate a grid condition, wherein the grid condition is either a regular grid condition or a disturbance condition of the grid, and wherein the at least two generating units are configured to be operated according to the at least one control signal, and wherein, when the at least one control signal indicates a grid disturbance, the generating units are disconnected and/or stopped and/or restrained from restarting in order to prevent a power transfer between the generating units and the grid, and wherein, when a signal indicative of a regular grid condition is received by the at least two generating units, the at least two generating units restart and/or reconnect in order to restart a delivery of electric power towards the grid; and wherein the at least one control signal is further configured to allow a detection of a lost or invalid communication such that the generating units are capable of detecting whether the at least one control signal is lost or invalid; and wherein the generating units are disconnected and/or stopped and/or prevented from restarting whenever a lost or invalid at least one control signal is detected. measuring a voltage and/or frequency characteristics of an electrical signal of the electric grid at the point of injection; communicating to at least two generating units of the at least two generating units of the windfarm at least one control signal based at least in part on the measured voltage and/or frequency characteristics of the electrical signal of the electric grid at the point of injection, the at least one control signal being indicative of a grid situation at the point of injection; and, controlling the at least two generating units of the at least two generating units of the windfarm at least in part based on the communicated at least one control signal; and wherein the at least one control signal is configured to communicate a grid condition, wherein the grid condition is either a regular grid condition or a disturbance condition of the grid, and wherein the at least two generating units are configured to be operated according to the at least one control signal, and wherein, when the at least one control signal indicates a grid disturbance, the generating units are disconnected and/or stopped and/or restrained from restarting in order to prevent a power transfer between the generating units and the grid, and wherein, when a signal indicative of a regular grid condition is received by the at least two generating units, the at least two generating units restart and/or reconnect in order to restart a delivery of electric power towards the grid; and wherein the at least one control signal is further configured to allow a detection of a lost or invalid communication such that the generating units are capable of detecting whether the at least one control signal is lost or invalid; and wherein the generating units are disconnected and/or stopped and/or prevented from restarting whenever a lost or invalid at least one control signal is detected.