دانلود رایگان مقاله انگلیسی استراتژی کنترل سیستم تبدیل انرژی باد مبتنی بر PMSG تحت شرایط باد شدید - الزویر 2018

ABSTRACT

This paper presents a control approach for the Permanent Magnet Synchronous Generator (PMSG) based Wind Energy Conversion Systems (WECS) under a wide range of wind speeds. Generally, most of the wind turbines are turned-off and disconnected from the power grid, in case wind velocity is gone over 25 m/s. It may cause wind power supply shortage from wind farms. This research introduces a pitch angle controller as well as a rotational speed control system so that the PMSG based WECS can generate power if the wind speeds are above 25 m/s. The proposed method reduces the mechanical stress of the wind turbine by preferential reducing of the rotational speed rather than the mechanical torque during strong wind condition. As a result, the chance of turning-off the is reduced compared to the conventional control system because the PMSG based WECS can temporarily tolerate the wind speed up to 35 m/s. A 2 MW WECS with the electrical and mechanical characteristics is modeled in the MATLAB/SimPowerSystems® to verify the proposed research.

Conclusion

This paper describes a control method for the PMSG based WECS under strong wind conditions. Conventional control method is compared with the proposed control method considering same conditions and system parameters. In the MPPT control area, both conventional and proposed systems have shown similar performances. When the wind turbine is controlled at the rated power, the power fluctuation occurs with the conventional method. This is because, it is controlled by only the pitch angle control system with some delays. In the proposed method, both pitch angle and rotational speed control methods are designed for the wide-windrange of wind velocity. As a result, the output power is controlled with high accuracy by using the proposed method. In addition, the proposed method preferentially reduces the rotational speed rather than the mechanical torque in order to reduce the power coefficient and the centrifugal force during the strong wind conditions. For this reason, the allowable condition of power generation can temporarily reach up to the wind speed of 35 m/s. Therefore, it can be said that the PMSG based WECS with the proposed control method can avoid a sudden cut-off from the power grid during strong wind conditions as well as can continue to generate power in the typhoon prone area. However, if the wind speed goes above the 35 m/s the wind turbine needs to be shut down. In doing so it will give some time to bring appropriate load-frequency control action rather than sudden generation curtailment.