| Unified Power Quality Conditioner is the emerging device for custom powertechnology, it sets the voltage compensation devices, current compensation device andenergy storing device in a body, unified realizes multiple power quality adjustmentfunction, and one machine can be changed more, has a high cost performance, is thelatest trend and the key equipment of custom power technology development, soUnified Power Quality Conditioner has become the research hotspot in this field. Inrecent years, many advanced foreign countries has set up a file in the development ofthe device which can comprehensive solve a variety of power quality problems. Thecurrent UPQC using isolation method basically is the isolated transformer in series orparallel unit access system. Based on the traditional UPQC isolation method, here putforward a dc side of isolation UPQC based on the new single phase UPQC structure. Indc side UPQC isolation, series compensation unit and parallel compensation units of theactive power filter were no longer need to through the transformer to connect with thepower grid. The isolation between power grid and device is realized by dc side. So it notonly effectively realizes separation between the power grid and the device, but alsoavoids many negative factors because using transformer isolation in parallelcompensation or series compensation side. It has important theoretical and practicalsignificance.Taking bridge type structure bi-directional dc convertor as the foundation,this paper studied in isolation technology of UPQC dc link.The paper mainly work asfollowing:1By the comparation of different indemnifying measures of electricity quality,wecan see that UPQC is a favorable indemnifying measure of electricity qulity.2.Introduce the basic operating principle of UPQC and traditional isolatingmethods,expound the isolating requirements of UPQC,put forward the idea that directcurrent side should adopt a DC/DC isolating converter,and expound its feasibility.3.Introduce the basic concept and current situation of bothway directconverter,point put that bridge bothway direct current converter is suitble to serve as theDc side isolating circuit. 4.Discussion the basic working principles of phase shifting control bridge typetwo-way dc converter,Focuses on the analysis of the working princeples of the wholebridge two-way DC-DC DC converter and symmetric half bridge two-way DC-DCconverter,make a modeling analysis and put scheme of Using isolated symmetricaltype a half-bridge bi-directional dc converter UPQC realize dc side isolation aftercomparation.5,Design the parameters of a symmetrica half-bridge bi-directional dcconverter,Specific driver circuit.Design sampling circuit and the input signal regulatecircuit,and give the design of the hardware and software of the control system on thebasis of TMS320LF2407.6.Through the simulation and experimental analysis, verified that the symmetrichalf bridge two-way DC-DC converter UPQC realize DC unit effectiveness of isolation... |
