| With the rapid development of the economy and technology, the modern society relies more and more on the electrical power, which provides higher requirement on the development of smart grid. The smart grid has become the focus in the electrical engineering field, because it has the ability of real-time monitoring, protecting and control the elements in power system and optimize the operating mode, which can satisfy the requirement of security and stability, and the development of harmonious community. Among the constructions of the smart grid, the intelligence of smart distribution grid system is an important part, which can seriously influence the function of the smart grid. Several researches shows that smart distribution grid can effectively enhance the management, reliability, capability and economy of the distribution grid, and can also decrease the losses in the lines. However, the realization of smart distribution gird is still a problem that the operators should deal with. This paper mainly studies the problems that occur in constructing smart distribution grid platform, which is highly valuable in actual engineering application.This paper analyzes the planning target of smart distribution. The assessment system is constructed based on the demand of smart distribution grid, and the construction principles are also discussed as well. Based on the details of different subsystems, the following parts are discussed:the primal grid and equipment, distribution automation central system, feeder line automation, distribution termination, distribution communication network, information exchange bus, distribution operation and management platform, and the planning target that dispatches and controls the distribution as a whole. Through rationally planning different subsystems, the information exchange in the core transaction of the distribution grid is improved, and different modules cooperate and are integrated as well, which effectively increase the efficiency of the utilization of the distribution grid. The entropy value method is used to determine the investment weight in the construction of each subsystem, which can be used to guide the distribution of the investment in smart distribution grid.The construction schemes of smart distribution grid are analyzed based on the planning schemes. The construction principles and schemes are analyzed on distribution automation central system, feeder line automation system, the construction and improvement of distribution equipment and termination, integration of distribution dispatch and control, and so forth. Several typical cases in constructing each subsystem are discussed in detail. The construction scheme of secondary system protection is discussed, in order to guide the construction of smart distribution grid.Finally, the construction scheme proposed in this paper is realized in the distribution grid in a city. The equipment maintenance application system, dispatch/control risk management, and management system of distribution dispatch and control integration are analyzed, as well as the effect of the proposed schemes. The analysis shows that the distribution grid is enhanced in reliability, integration, management, information exchange, data accuracy, supply reliability, voltage quality, and decrease in line losses. The construction of central station and termination, as well as that of communication system, satisfy the requirement of smart grid.Through the experience of construction of smart distribution grid, combining the actual situation, the smart distribution grid platform is constructed, which is very effective in realization of distribution automation. This application also paves the way for further researches on analysis and optimization, and deep cooperation with user information collection, operation PMS system, dispatch PMS system and so on. |
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