| The series unit of unified power flow controller (UPFC) is the main object of study in this thesis.Starting with the perspective of the intelligent distribution network,use the unified flow controller inject series voltage to achieve the control of interlinked distribution system with dual sources.The development history and research status of the unified power flow controller as well as the meaning to the electric power industry development in our country is summarized. The system structure and basic principle of unified power flow controller is introduced, and the power flow control function of UPFC series unit is mainly analyzed. The control strategy of UPFC series units and its tracking control mode of command signal is discussed, providing theoretical basis for experimental study of this paper.The double closed-loop voltage control system which contains the instantaneous value of the inner ring and the average value of outer ring is designed, and the parameters selection of the PI controller is discussed. Studied the frequency response characteristic of system after PI correction by bode diagram. The series connection control system is theoretically proved stable and feasible.The minimum system circuit and system functional circuit based on TMS320LF2407A type of DSP chip is designed. According to the function of the control system, the control block diagram of the main program and related system software interrupt subroutine is drawn. The model of interlinked distribution system with dual sources based on UPFC is Build. Carried on experiments and data analysis, the expected goal of power flow controlling by using UPFC is achieved. |
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