The Research On Harmonic Analysis And Cuppression Methed Of Medium Voltage DC Circuit Breaker Experiment System

Dc circuit breaker short circuit current open circuit test system is that,which is to test the breaking capacity of short-circuit currentimportant tool.It plays an important guiding role on the production design of dc circuit breaker.However,dc circuit breaker short circuit current open circuit test system in the process of operation will produce a large number of harmonics.Not only causing pollution to power network,then it will impact test system in the operation of equipment,but also affecting other daily load under the normal power grids.So the test system which of the dc circuit breaker short circuit current open circuit,is great significance for operation process of harmonic suppression.The background of dc circuit breaker based on the experiment system has carried out the following work:In this paper,with the test system of dc circuit breaker as the research object.Dc circuit breaker test builts the simulation model of the main module.And on the working process of the light,It carrys on the corresponding simulation validation in system transient condition.In this paper,the current methods of harmonic analysis method are introduced.The simulation analysis of the impact on generator running under different conditions the running situation of the whole system.Comparing the several kinds of commonly used methods of harmonic analysis.Because of the Hilbert huang algorithm(HHT)is imperfect,the corresponding improvement strategy is proposed.According to the characteristic of this topic transient and stability,In this system wavelet packet decomposition and reconstruction of signal is applied.To implement the wavelet algorithm of harmonic analysis.As the harmonic analysis results,In view of the power conversion device to produce harmoni,were dicussed and analyzed though simulation for Power conversion device harmonics.On the harmonic detection,Expounds the composite detection method based on the theory of theinstantaneous ip-iq,and verify the simulation of accurate.According to the test,The cut-off frequency and low pass filter order both in precision and dynamic follow in sexual relations,Further analysis and relevant conclusions about them.With the harmonic current detecting based on wavelet transform and HHT algorithm.then set up the simulation model.And the two methods are simulated.The two methods could detect harmonic,good detection effect is compared with the traditional method has significant advantages.Base on the compensation control method,the defect of feedforward control method and the closed loop control method is discussed.In view of the defects is optimized,the double closed-loop feedback control method are adopted.This method suppresses the harmonic well,filtering effect is obviously better than traditional control method.On the basis of theoretical analysis and simulation study.For a series hybrid active power filter installation location,Filter coupling transformer placement position and filter the layout of the main circuit of main circuit of the filter capacitor filter inductor parameters selection.Through the simulation experiment shows that the filtering performance of the filter is superior...