Dynamic performances of a practical scale wind power plant consisting of series-connected ten wind turbine generators and a current-source thyristor inverter are discussed. It is shown that tip speed ratios of the individual turbines can be controlled almost constant at an optimum value with the tip speed ratio control, making an effective operation of the system possible. Also the effects of control parameter in the control system on the dynamic performances of the whole system are investigated, and a way of selecting for the control parameters is given.