【正文】 torage device. Targets: propose the system planning methods and the technologies that can meet the demands when the large renewable energy integration to the power grid. 13 D. Distributed Generation and Coordinated Development of Transmission and Distribution Network Research content: Study the operating characteristics of different distributed power generation and power supply system, study the interaction mechanism between the distributed power supply system and the power grid. Study the coordinated development at all levels of power transmission and distribution under the smart grid goals, and propose the design principles about the coordinated development of the 5 power transmission and distribution planning at all levels。s Smart Grid Chinese smart grid framework could be different from the rest of the world. This is due to the relatively primitive structure at the distribution ends, the extensive development ofUHV transmission in recent years, and also the unique asset ownership and management structure in China. China39。800kV, 177。s Smart grid The general development goals of China smart grid is speed up construction of a strong power grid with UHV power 9 grid as backbone, coordinated development of power grid at all voltage levels, with information technology, digitization, automation, interactive features into independent innovation, the world39。s Smart grid The basic development goal of power grid is to form a security and economical power grid. Constructing smart grid firstly depend on strong physical power grid. China speeding up the construction the power grid with UHV grid as backbone and subordinate grids coordinated development at all levels. In the technical and institutional, equipment manufacturing and project put into practice aspects has laid down solid basis for the development of smart grid [16]. 8 China pays more attention to research and project implementation, many achievements in smart grid have been acplished in China. To be specific, China has already research and implementation in following technical aspects: Generation link: In the power generation link includes distributed generation, renewable energy generation, generator and power system coordinate operation, and energysaving oriented dispatching technology and autogeneration control. Transformation link: In the power transformation link includes UHV AC and UHV DC transmission, FACTS, digital substation technology, PMUbased W AMS, DMS, stateoriented maintenance and so on. Distribution and supply link: In the power distribution and supply link includes distribution automation system and feeder automation system, custom power, autometering, Automation measurement technology and electric automobile charge power station construction and so on. Dispatching link: In the Dispatching link, much research and application have been carried out, such as next generation dispatch technology supporting system, four main dispatch application platforms, dispatch technology of energysaving generation, online early warning and coordinated security and defense technology, integrated model management, massive information process technology, intelligent visualization, dispatch defense technology for extreme disaster. Information building link: In the information building link includes construction of system information collection, load management system, automatic meter reading system and other related systems. After promoting of marketing information work for many years, the coverage of users with electricity collected automatically improves every year, scope and effect of the system is in gradual expansion, it has played an active role in the pany39。s necessary to transmit the electricity through longdistance grid to load center. Generally, due to the intermittence and fluctuation of renewable energy, formulation and implementation of accurate power generation plan is impossible, which challenge the request the present ability on power acceptance and optimizing resource allocation. (3) Various generation options require to construct open and transparent, friendly and interactive power grid 7 With the improving of future Chinese electrification level, power generation enterprises and customers will have higher requirements for service quality and principles. In order to guarantee the power production and transmission, power generation enterprises require power grid to provide reliable, efficient and flexible power integration. Electrical power customers will be able to flexibly choose power supply modes, need interaction between power grid to realize high efficient economical power utilization, and be capable to send distributed energy power to power grid in the right time to realize clean and efficient energy utilization. (4 ) The development of power and relative industry require to construct power grid with leading technology and equipment Depending on technology innovation, constructing unified strong smart grid is the development direction of power grid of china. Many advanced technologies and advanced equipment will be applied in constructing smart grid, a substantial platform can be established for the stable and secure operation of grids and improve the strength of the grids39。s power is generated by dirty coal plants. The government has stated that it wants to clean up its act by boosting renewable power generation to 15 percent of the total power supply by 2020. Chinese smart grid proposals call for the integration of renewable power sources, including wind and solar. The current power grid isn39。s Smart grid (1) Rapid growth of economy and society require to construct strong and reliable, efficient and economical 6 power grid Power grid is the important infrastructure of energy. Chinese ec