Research On Physical Modeling Of UPFC

The Unified Power Flow Controller (UPFC) is one of the most enterprising realizations of the idea of Flexible AC Transmission System (FACTS). Having the ability of controlling most of the basic power system parameters, UPFC can flexibly adjust the real and reactive power through the transmission line, damp the oscillation, and enhance the stability of power system and so on. These characters make UPFC the most desirable control device in AC transmission system.In this paper, the state of the art of UPFC is first presented, which include the control methodology and its influence on power system operation. After analyzing the basic principle, the series connection states and parallel connection states are both discussed and then the control methods are designed. Furthermore, a program flow chart and its implementation are given based on DSP. At the same time, this paper also designed and composed the main structure circuits and its auxiliarycircuits that are mainly constituted by Intelligent Power Model (IPM).With the circuits and software, a tentative UPFC device is build up and lots of experiments prove the feasibility of the device that establishes the rationality of the design idea and should direct the fabrication of the integrated UPFC device. In addition, these researches give bases for further study.