分布式系统背景谐波APF抑制

燕山大学工学硕士学位论文AbstractWith more and more attention on sustainable development and environmentalpollution,distributed generation,wind power and solar as representative,has been widelydeveloped.Aim to improve power quality,a certain number of inductive and capacitivedevices are installed in the distributed system and they affect the characteristic parametersof the transmission line which make the harmonic magnify easily in the situation of lightload or no-load.Based on the transmission line theory,it can be concluded that the reflected wave isthe fundamental reason of harmonic magnification and there is no reflected wave when thetransmission line is infinite and the impedance matching at the end of line.In the paperR-APF and discrete-frequency tuning method are based on the impedance matching andthe simulation and experiment are given.The paper propose the infinite long line harmonic suppression strategy which isinstalling an APF at the end of the line and control the output current of the APF to imitatethe infinite long transmission line.Compare to the R-APF,it is excellent in the variablecharacteristic impedance and including current harmonic load.To improve the reliability of the power system,the ring network is applied to supplypower to users.This paper researches into the harmonic propagation in the ring network,points out the optimal installation point and also give some advice to choose the APFcompensation gain.Experiments based on TMS320F2812 have been performed to verify the theoreticalanalysis and demonstrate the effectiveness of the proposed strategies.Keyword:harmonic magnification;R-APF;infinite long transrmission line;ring network;harmonic suppress