Research And Design Of Intelligent Composite Electrical Equipment

Along with the electric power applications continue to expand in various fields, represented by electrified railway, new types of electric facilities develop rapidly, this put forward higher requirement to the construction of the power grid. Composite electrical equipment has some advantages, such as compact structure, high reliability, good coordination and maintainability, it has become the important developing direction of grid equipment. This paper mainly studies the design of composite electrical equipment with transformer as the main body. On the one hand, the reactive power compensation device forms a combination with the transformer. On the other hand, the N+1 redundancy theory is applied to the design of combination, thus realizes modular combination of the transformer.The application of transformer is facing many problems:high operating loss, poor reliability and low degree of integration. Energy-saving amorphous transformer has its limitations in the design of the large capacity model, and it also need to increase the reliability. The method of transformer parallel operation solves the problem of reliability in a certain extent, but it is not an economical way. The type of distribution equipment is constantly increasing, maintenance becomes more complex, the space becomes larger, it has important practical significance to increase the degree of integration.First of all, the paper analyzes the application of reactive power compensation technology. Reactive power compensation is very important, in particular, the role of reactive power compensation for transformer side. It studies the scheme of integration between transformer and parallel capacitor or SVG. The combination of the two did not form a real composite structure. So, the paper puts forward a integration of the iron core structure on the basis of the magnetic controlled reactor and transformer. Then on the basis of analyzing the reliability of transformer and existing solutions, the paper puts forward the N+1 redundancy technology applied in transformer modular combination, and studies the requirements of technical parameters for transformer, analyzes the judgment of advantages and disadvantages of transformer module technology.Second, the paper studies the magnetic circuit of new integrated structure. In order to analysis the influence of composite magnetic flux to transformer, the magnetic circuit of the magnetic controllable reactor is analyzed, its magnetic flux dynamics equation is obtained. With the purpose of realizing the normal function of the transformer, the paper analyzes the changes of magnetic flux and obtain the design scheme of transformer. And then from the perspective of overall cooperation combination, this paper discusses the implementation of reactive power compensation control and the strategy of the economic operation. The reliability of the N+1 redundancy modular system is analyzed and calculated, proved that the technology of the intelligent composite electrical equipment can improve its reliability. According to the control strategy of economic operation, its energy saving effect is analyzed and calculated, and its cost is discussed. All of these prove its comprehensive advantages.Finally, based on a series of analysis of functions and features, the controls of the intelligent composite electrical equipment is designed from two aspects. Considering the reactive power regulation and economic cutting, two softwares are formed. And this paper analyzes the algorithms of thyristor trigger angle. The switching circuit of combination module, the control circuit of loop current and the circuit of signal acquisition are designed.