变速控制法实现DFIG风电机组的功率备用适用于额定风速以下的运行工况，

The variable speed control method realizes the power reserve of DFIG wind turbines. It is suitable for operating conditions below the rated wind speed. Its change speed is fast. It can be well combined with the comprehensive inertia control described later. It is suitable for wind turbines to participate in the primary frequency adjustment of the power grid. , This chapter will focus on the discussion. Since the pitch angle control is of a mechanical nature, because the frequency of the power system changes very frequently, if the pitch angle directly responds to the frequency of the system, frequent actions may cause mechanical wear, and the pitch angle action is slow, so it is mainly used for secondary frequency adjustment. Use, this article will be discussed in Chapter 4.

The variable speed control method realizes that the power backup of DFIG wind turbine group is suitable for operating conditions below the rated wind speed, and its speed of change is fast, which can be combined well with the comprehensive inertia control described later, and is suitable for wind turbine group to participate in the frequency regulation of the power grid at once, this chapter is discussed as a focus. Pitch angle control is mechanical in nature, because the frequency of the power system changes very frequently, so if the pitch angle directly responds to the frequency frequent movements of the system may cause mechanical wear, and the pitch angle movement is slow and therefore mainly used as secondary frequency regulation, this paper will be discussed in chapter four.

The variable speed control method realizes the power reserve of DFIG wind turbine set, which is suitable for the operation condition below rated wind speed, and its change speed is fast. It can be combined with the integrated inertia control described in the later article. It is applicable to the wind turbine participating in the primary frequency regulation of the power grid. This chapter is discussed as a key point. Because of the mechanical property of pitch angle control, because the frequency of power system changes frequently, if the pitch angle directly responds to the frequent frequency of the system, it may cause mechanical wear, and the pitch angle is slow, so it is mainly used as the secondary frequency adjustment. This paper will discuss in chapter four.<br>