In recent years the wind energy has been reconsidered because it is clean and the many studies for the effective use of the wind energy have been done. However, it is difficult to study the control method of speed and output power of the windmill generator system, because the wind speed is influenced by geographical feature and weather condition. Therefore a windmill simulator is required in order to study the wind power system constantly.
In this paper, the design and the characteristics of windmill simulator are described. The simulator is mainly composed of three devises, that is, a d.c. separately excited motor, a d.c. high power amplifier and a personal computer and is able to simulate the windmills by changing the coefficients in software. As examples, the stock multibladed windmill and the propeller type windmill are simulated. The steady state characteristics obtained by simulator are compared with the practical and the theoretical characteristics. Moreover the transient responses and the dynamic characteristics for natural of the windmill systems are investigated by using the simulator. As a result, it becomes clear that the proposed windmill simulator is useful to study the control methods of the windmill generator systems.