A method of controlling a wind turbine, the method comprising: over-rating the wind turbine above the wind turbine's rated power in response to a control signal ; applying an over-rating control algorithm (803-806) that restricts the amount of additional power produced by over-rating the wind turbine, due to the control signal, based upon one or more turbine parameters including a first turbine maximum power level parameter and a second turbine maximum power level, the first turbine maximum power level being the individual maximum power level for the turbine at its respective micro-site; the second turbine maximum power level being the turbine type maximum power level for the given turbine type constrained by the ultimate load limits of the wind turbine mechanical components, and the design limits of the electrical components, and wherein the over-rating control algorithm restricts power output to a value at or below the first maximum power level, characterised in that the method further comprises: receiving an over-ride signal; and in response to the over-ride signal, over-riding the over-rating control algorithm to temporarily increase the amount of power output by the wind turbine for a period of time, by applying the second maximum power level, that is greater than the first maximum power level, wherein the over-ride signal is generated in response to the power output of the wind turbine falling below a target value, or in response to an action taken by a grid operator, or in response to the detection of an unexpected event. over-rating the wind turbine above the wind turbine's rated power in response to a control signal ; applying an over-rating control algorithm (803-806) that restricts the amount of additional power produced by over-rating the wind turbine, due to the control signal, based upon one or more turbine parameters including a first turbine maximum power level parameter and a second turbine maximum power level, the first turbine maximum power level being the individual maximum power level for the turbine at its respective micro-site; the second turbine maximum power level being the turbine type maximum power level for the given turbine type constrained by the ultimate load limits of the wind turbine mechanical components, and the design limits of the electrical components, and wherein the over-rating control algorithm restricts power output to a value at or below the first maximum power level, characterised in that the method further comprises: receiving an over-ride signal; and in response to the over-ride signal, over-riding the over-rating control algorithm to temporarily increase the amount of power output by the wind turbine for a period of time, by applying the second maximum power level, that is greater than the first maximum power level, wherein the over-ride signal is generated in response to the power output of the wind turbine falling below a target value, or in response to an action taken by a grid operator, or in response to the detection of an unexpected event. in response to the over-ride signal, over-riding the over-rating control algorithm to temporarily increase the amount of power output by the wind turbine for a period of time, by applying the second maximum power level, that is greater than the first maximum power level, wherein the over-ride signal is generated in response to the power output of the wind turbine falling below a target value, or in response to an action taken by a grid operator, or in response to the detection of an unexpected event. <EOS>