A wind power plant control system (15; 15'; 15") arranged for controlling one or more wind turbine generators (WTG 1, WTG 2,..,WTG n) in a wind power plant, - wherein the wind power plant control system (15; 15'; 15") comprises a power plant controller and a modeling unit (26; 26'), the modeling unit (26; 26') being operatively coupled to the power plant controller, - wherein the modeling unit (26; 26') uses a model for estimating values of electrical output parameters from the one or more wind turbine generators (WTG 1, WTG 2,..,WTG n), the modeling unit (26; 26') being arranged to calculate estimated values (ŷ 1, ŷ n2,...ŷ n) of the electrical output parameters from the one or more wind turbine generators (WTG 1, WTG 2,..,WTG n), and to output said estimated values (ŷ 1, ŷ n2,...ŷ n) to the power plant controller, - wherein the modeling unit (26; 26') is arranged to receive measured values (y dm1, y dm2,..,y dmn) of said electrical output parameters from the one or more wind turbine generators (WTG 1, WTG 2,..,WTG n) of the wind power plant, - wherein the modeling unit comprises a comparator arranged to generate an estimation error signal (ε; ε') indicative of the difference between said measured values (y dm1, y dm2,..,y dmn) and said estimated values (ŷ 1, ŷ n2,...ŷ n), - wherein the estimation error signal (ε; ε') is used by the modeling unit (26; 26') to update the model, - wherein the measured values (y dm1, y dm2,..,y dmn) are transmitted to the modeling unit (26; 26') at a first sampling rate, and the modeling unit (26; 26') is arranged for outputting the estimated values (ŷ 1, ŷ n2,...ŷ n) to the power plant controller at a second sampling rate, the second sampling rate being higher than the first sampling rate, and - wherein the power plant controller is arranged for determining reference signals (ũ 1,..., ũ n) for dispatching to the one or more wind turbine generators (WTG 1, WTG 2,..,WTG n), and wherein said estimated values (ŷ 1, ŷ n2,...ŷ n) of said electrical output parameters are used by the power plant controller in the determination of said reference signals (u 1, u 2,.., u n). - wherein the wind power plant control system (15; 15'; 15") comprises a power plant controller and a modeling unit (26; 26'), the modeling unit (26; 26') being operatively coupled to the power plant controller, - wherein the modeling unit (26; 26') uses a model for estimating values of electrical output parameters from the one or more wind turbine generators (WTG 1, WTG 2,..,WTG n), the modeling unit (26; 26') being arranged to calculate estimated values (ŷ 1, ŷ n2,...ŷ n) of the electrical output parameters from the one or more wind turbine generators (WTG 1, WTG 2,..,WTG n), and to output said estimated values (ŷ 1, ŷ n2,...ŷ n) to the power plant controller, - wherein the modeling unit (26; 26') is arranged to receive measured values (y dm1, y dm2,..,y dmn) of said electrical output parameters from the one or more wind turbine generators (WTG 1, WTG 2,..,WTG n) of the wind power plant, - wherein the modeling unit comprises a comparator arranged to generate an estimation error signal (ε; ε') indicative of the difference between said measured values (y dm1, y dm2,..,y dmn) and said estimated values (ŷ 1, ŷ n2,...ŷ n), - wherein the estimation error signal (ε; ε') is used by the modeling unit (26; 26') to update the model, - wherein the measured values (y dm1, y dm2,..,y dmn) are transmitted to the modeling unit (26; 26') at a first sampling rate, and the modeling unit (26; 26') is arranged for outputting the estimated values (ŷ 1, ŷ n2,...ŷ n) to the power plant controller at a second sampling rate, the second sampling rate being higher than the first sampling rate, and - wherein the power plant controller is arranged for determining reference signals (ũ 1,..., ũ n) for dispatching to the one or more wind turbine generators (WTG 1, WTG 2,..,WTG n), and wherein said estimated values (ŷ 1, ŷ n2,...ŷ n) of said electrical output parameters are used by the power plant controller in the determination of said reference signals (u 1, u 2,.., u n).