matpower4.0b4

代码说明：

  MATPOWER 是一个基于matlab m 文件的组建包，用来解决电力潮流和优化潮流的问 题。它致力于为研究人员和教育从业者提供一种易于使用和可更新的仿真工具。Matpower 的设计理念是用尽可能简单、易懂，可更新的代码来实现最优秀的功能(Matpower is a package of Matlab M-les for solving power ow and optimal power ow problems. It is intended as a simulation tool for researchers and educators that is easy to use and modify. Matpower is designed to give the best performance possible while keeping the code simple to understand and modify.)