电力系统分析的作业，研究生考试的重点内容。讲解的非常详细，可以参考。-Power system analysis jobs, postgraduate exams focus on content. To explain in great detail, you can refer to.

国家电网考试学习资料——电力系统分析（研究生专用）(The state grid test learning materials——Power System Analysis（Graduate student is special）)