In order to capture the maximum wind energy and improve the efficiency of wind turbine,the yaw control system was researched.This system takes the initiative to windward.The relative wind direction is measured by the wind sensor.According to the relative wind direction,yaw angle is calculated by the DSP and generate the drive pulse.Then the stepping motor is controlled to turn or turn over by the subdivision control technology to make the turbine windward.Through this way,the yaw control system can track the wind direction automatically.Experimental results show that using DSP control,the real-time performance of yaw system is good and operation precision of stepping motor is high by the subdivision control technology.Therefore,the yaw system tracks the wind direction quickly and exactly.

The operation principle of the wind turbine is analyzed,the characteristics of wind turbine and induction motor are contrasted,a simple and effective control scheme is proposed based on speed,a wind turbine emulation platform including industrial computer,date acquisition card,transducer and induction motor is set up,and the supervisor system is designed using LabVIEW.This wind turbine emulation system is used in a new type of dual stator-winding induction wind power system,and achieves to run at different wind speeds and different loads in according with the characteristics of the real wind turbine,which satisfies the need of the research on the maximum wind energy tracking of dual stator-winding induction wind power system.The experiment shows that this control scheme is realized easily and exactly,which can be used in the laboratory conveniently.

With the increasingly deep and wide research on wind power technology,the wind turbine emulation technology has been developing fast in the recent ten years.The wind turbine emulator can be used in a similar way as a real wind turbine,which provides a effective way for the research of wind power in the lab.Based on the characteristic of wind turbine,some concrete schemes of the wind turbine emulation at home and abroad was presented and a summarize of each scheme was given.

The usual dual-stator winding induction generator (DWIG) is composed of three-phase power windings and three-phase control windings, named as 3/3-phase DWIG. The power winding has only three phases, and also connects to a rectifier load, which results in larger harmonic magnetomotive force (MMF) in the generator. In order to overcome these problems, the power winding of 3/3-phase DWIG is converted from three phases to six phases. A novel 6/3-phase DWIG with six-phase power windings and three-phase control windings is proposed. The six-phase power windings of it are divided into two Y windings shifted by 30° electrical angle. In this paper, the control technology of this novel 6/3-phase DWIG system operating on variable speeds is studied. Based on the control winding flux oriented scheme, for a 600 V/18 kW 6/3-phase DWIG system running at variable speeds, a series of simulations and experiments are researched. The results demonstrate that the system has the good performance over a wide speed range of 500~1000 rpm, and it is suitable for the application of wind power generation.

The usual dual-stator winding induction generator (DWIG) is composed of 3-phase power winding and 3-phase control winding, defined as 3/3-phase DWIG. The power winding has only three phases, and connects to a rectifier load, which results in larger harmonic magnetomotive force (MMF) in the generator. In order to overcome this problem and improve the performance of the DWIG system, the power winding of 3/3-phase DWIG is converted from three phases to six phases. A novel 6/3-phase DWIG with six phase power windings and three phase control windings is proposed. The six power windings of it are divided to two Y windings shifted by 30deg electrical angle. In this paper, in order to further study the static and dynamic characteristics of 6/3-phase DWIG system with a rectifier load, harmonic MMF in generator are analyzed in detail. The corresponding relationship between the harmonic current and harmonic MMF is achieved. Based on these, the model of a 600 V/18 kW 6/3-phase DWIG system is built-up. The simulation and experiment results indicate that the 6/3-phase DWIG system has excellent performance over the wide speed rang and is suitable for the application of wind generation.

In order to capture the maximum wind energy and improve the efficiency of wind generation system, the yaw control system is researched. This system takes the initiative to windward. According to the control algorithm proposed in this paper, yaw angle is calculated by the DSP, and the drive signals of stepping motor are generated. The stepping motor is controlled by the micro-stepping control to drive the yaw mechanical device to make the wind turbine windward. Through this way, the yaw control system can track the wind direction automatically. Experimental results show that based on the proposed control algorithm and DSP control, the performance of yaw system is great and the operation precision of stepping motor is high. Therefore, the yaw system has the ability to track the wind direction quickly and exactly.