Research Of The Key Technologies For The Distribution Automation System And Development Of Transformer Terminal Unit

The Distribution Automation System (DAS) is a control system with information management, which involves in computer technology, automatic control technology, data communication technology as well as related electric power technology. It is a hot topic for electric power management to develop DAS. Considering the development level of computer technology and communication technology, this thesis makes a detail study on system construction strategies and proposes concrete construction strategy for Guangzhou Power Supply Bureau, in which hierarchical structure model, communication mode, power cable fault location technology as well as implementation of Transformer Terminal Unit (TTU) are studied deeply in support of this strategy. This thesis then puts forward technical scheme of power cable fault location and the designed idea and implementation approach of using SCILAB to analyze errors of various kinds of ac sampling algorithms. At last, this thesis presents design scheme of software and hardware and key modules for TTU. Main research innovations in this thesis are as follows:1. Two- tier structure of distribution network. Constrained by historical development level of computer technology and communication technology, generally, three-tier structure is used in the classical DAS, which, however, shows enormous redundancy and waste of resources. To solve this problem, it has proposed that DAS for Guangzhou Power Supply Bureau should choose two-tier structure by proving the feasibility. The practice has proved that the method proposed by this thesis not only meets the project need, but also conforms to the modern technology characteristic and the trend of development.2. Communication technology strategy based on the wireless public network. The traditional strategy is realized by private network and the cost is very high. According to the development of the wireless communication technology, it has proposed that using wireless public network technology to build the wireless virtual private network to realize DA. Breaking with the traditional thinking mode based on the virtual private network, this method succeeds in reducing the communication network construction expense and maintenance cost.3. Power cable fault location scheme based on cable fault indicator and main station with fault detection and location. The power cable fault location scheme is given in which power cable fault indicator is used to automatically upload information and main station with fault detection and location is adopted. As a result, the construction expense and running maintenance cost are greatly reduced.