Research On Series Converter Of Unified Power Quality Conditioner

With the development of power electronic technology and emergency of much non-linear load in power system, the power quality has been more and more deterioration. At the same time, customers' requirements on the quality and reliability of electrical power supply grow higher and higher. Unified Power Quality Conditioner used in three-phase four-line system can effectively compensate multiple different power quality interferences originated either from the load side or from the line side, improve the reliability and quality of power supply.Unified Power Quality Controller as a promising Integrate Compensator has already attracted people's widespread attention. This dissertation is a part of the project of Flexible Alterative Current Distribution System which is belongs to School Fifteenth Special Science and Technology Fund. This dissertation is focus on the study of series converter of Unified Power Quality Controller for three-phase four-line distribution power system which capacity is 10kVA.This dissertation presents topological structure and control strategies of Unified Power Quality Controller, analyzed UPQC's Compensation Principle and amathematical model for UPQC's series part. This dissertation focus on the study of Detection Method of Voltage distortion for UPQC's series part and the Control Strategies. The dissertation finally chooses the Detection Method of Voltage distortion based on Park Transforms. analyze the advantage and disadvantage of different PWM control methods. developed whole system using Matlab/Simulink. Computer simulation results demonstrated that the proposed Detection Method of Voltage distortion is correct and valid.This dissertation also designs the parameters of UPQC's series part main circuit and combination with simulation to optimize the parameters. A full digital control system based on DSP is built with TMS320F2812 and the hardware circuit of UPQC's series part control system have been designed and tested. The control program is written by C language. Finally this dissertation does the experiments of UPQC's series part, shows the experiment wave and analyses the experiment result.