Analysis of a DC bus loss of power and its solutions in the power substation

To ensure the reliability of DC system,the insulation status of DC bus must be entirely monitored online.

However,the use of multi-inverter wiring with a common DC bus, make the power feeding back can be absorbed by other electric motor,and the excess electricity can also be feedback to the power grid through the feedback device,so that power can be fully utilized.

Firstly, triangular facet model is used to present a complex surface, and its quasi-rulings are computed.

In this paper,a new method for development of hull plate surface based on its quasi-rulings is presented.

The paper proves that the surface normal,which is followed by rectilinear generators on hyperboloid of on sheet,comstructs the hyperbolic paraboloid generated by two same parabola,when rectilinear generators go through the vertex of waist ellipse,and it also deduces that the hyperboloid of one sheet is constructed by surface normal through a certain rectilinear generator.

Some properties on rectilinear generators of hyperboloid of one sheet are researched.

It proves the three special natures of rector radius the vecfor of rectilinear generator and the two vectors on ruled surface derived cur

This article discussed the rationalization which ruled surface satisfied (a′(u),b(u),b′(u))=0 is developable surface r(u,v)=a(u)+vb(u) and verifies that only bunch of ruling of a ruled surface is essential condition but not full condition of developable surface.