| According to the fact that power factor of low voltage power networks is very low in China and Field bus technology is developing in the world, in order to enhance power factor of low voltage power networks, on the basis of central transmitting and controlling information among every compensation equipment, the author of this dissertation studies systematically the design principles of power factor dynamic compensation system. Based on analyzing structure of control system at present, the author of the dissertation puts forward a distributed completely and multi-layer structure framework based on field bus technology and builds a power factor intelligent dynamic compensation system. The functions of compensation unit, intelligent node, host computer, are presented. Appling closed loop control strategy in the power factor dynamic compensation system. Then the key techniques, for example, the fashion of real time sampling idle current and the fashion of compensation capacitor connected with, the time when the compensation capacitor are thrown up, are researched. CAN technology traits are analyzed, and CAN technology is applied on the power factor dynamic compensation system. On the basis of analyzing thoroughly the theories and techniques, software module of power factor dynamic compensation system are classed and their time-period is analyzed. The techniques of real time sampling idle current and generating compensation current are simulated with software. On the basis of theory analyzed, a circuit card used in intelligent node subsystem has been developed by means of development tools, such as C96, Protel99SE,PCB99, SJA1000, and 80C196KC. The power factor dynamic compensation system host subsystem has been developed by means of database, artificial intelligent technology, and DLL technology. Host subsystem is made up of man-interface module, intelligent analyzing module, and database module. The main conclusions are made and the future study areas are expounded at last.
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