With the increasing investment of power grid enterprise, grid infrastructure projects, especially the main network project investment, has begun to play an increasingly important role. This paper studies the whole life cycle of the main network investment projects, from pre-evaluation, interim evaluation and post-evaluation of the project to set up a complete technical and economic evaluation index system for the investment of the main network projects and achieve the overall project evaluation, making the main grid network investment have a more reasonable basis and get rid of the previous single and imperfect evaluation system of main network investment. Simultaneously, establishing a scientific evaluation system and a database of evaluation index can help to track the main network project investment to achieve more reasonable assessment reporting projects.

Wind power, strong and smart grid (SSG), analysis model, coordinated development Abstract. Chinese wind power industry has been experiencing a booming development in recent years and will keep the strong momentum of development through 2020. Some key problems are facing China’s wind power industry, which requires the innovation in technology and management. Fortunately, China is constructing Strong and Smart Grid which addresses the development of renewables. In this scenario, after analyzing some major wind-power related bottlenecks in China, the paper gives an in-depth introduction to the Strong and Smart Grid strategy. Finally, the paper presents a novel model for studying the coordinated development of wind power and grid.