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In the field of mechanical installation and repairing, drawing devices are often used to disassemble or push up components of various types of axie and set. Differential thread usually consists of two sets of threads, which differ in the aspect of side pitch, the movement distance of differential thread when it runs a circle should be the deviation of the two spiral side pitches. Through the application of differential thread, it enables us to make changes in the transmission of these two screw pairs making relative movement. Based on this principle, when it is made into the application of manual drawing device, it optimized structure of drawing device, receiving a better result.

As a kind of new renewable energy, wind power has been used in power systems more and more. Wind power has a installed capacity more than 10% of the power grid’s where the wind resources are abundant in our country. Because the wind power has the characteristics of randomness, intermittence, uncontrollability and so on, we can’t be sure about the continuity and stability. With the increase of the wind power installed capacity, the influence of wind power is expanding. By applying the PSCSD, this paper analyse the power gird’s stability of different wind power proportion and different access points.