envelop

说明：  海森频率格纸的绘制、绘制P-III频率曲线(Drawing P-III frequency curve with Hessian frequency grid paper)

PSCAD做的12模块H桥SVG模型，电流矢量控制，运行良好。(PSCAD do SVG module 12 H bridge model, the current vector control, work well.)

三次bezier曲线的绘制（其中调用pow（））。(The drawing of cubic Bezier curve (where pow ()).)

基于Bresenham算法的四步画直线算法,加快画直线速度(draw line based Bresenham update alogrith)

基于PSCAD/EMTDC搭建的双向dcdc，可做参考(Bidirectional dcdc based on PSCAD/EMTDC，provide you a strategy to build DCDC)

本文以电场的三大定理、连续超张弛迭代算法、拉格朗日插值算法等原理知识作为理论基础，以 C 语言为编程工具，将由根据以上物理和数学原理所推导出来的模型转化为可以计算像管内电势的 CAD 程序软件。所编写的程序可以在给定像管参数和电极电位的情况下，计算圆柱形像管内任意一点的电位大小，并绘制出像管内的等势线；拉格朗日插值得到对称轴上任一点的电位值。 (In this paper, we base on the three theorems of the electric field, continuous ultra-relaxation iterative algorithm, and Lagrange interpolation algorithm. We use the C language as a programming tools, and transform the model derived above into a CAD software to calculate the electric potential in the image tube. In case the image tube parameters and electrode potential are known, the program written can get the potential of every point in the image tube, and plot equipotential lines inside the image tube. It can also get the potential of every point on the axis of symmetry by Lagrange interpolation. )

用Bresenham画圆算法绘制椭圆(with Bresenham algorithm mapping Circle Oval)

三角形判断问题。可用于黑盒测试用例设计。(Triangle judgment. Can be used for black-box test case design.)

直接将坐标展在cad中和南方cass中的一功能相似，只是直接在cad中就直接能实现该功能。(Directly coordinate the event in cad and in the South cass of a function similar to, but directly in the cad on directly to achieve this feature.)

PSCAD基于两端两电平的柔性直流输电模型，对于研究直流输电建模是一个非常好的参考！(HVDC flexible model based on the two ends of PSCAD level, the study HVDC modeling is a very good reference!)