Research On Parallel Hybrid Active Power Filter

With the development of science and technology,electrical power has become more closely related to our daily lives.With continuous introduction of new energy vehicle,rail transportation system and various manufacturers,corresponding electrical and electronic high-power switch instruments have been widely used,which has resulted in significant increase of nonlinear load.It would generate massive harmonics injected into the utility grid,which may endanger the grid operation and equipment safety.Therefore,the grid harmonics have become a major problem that needs to be addressed.With a mixed resonant active power filter(HRTAPF)as the research object,this paper studies the design approach in specific project to improve the filter performance and actual application value of system.Based on related parameters of reactive compensation capacity and harmonic content in specific project,through analysis of the problems of poor dynamic performance and narrow applicability of static filter in the original scheme,this paper proposes a new HRTAPF filter to replace the original scheme,in this way to achieve both great dynamic and static performance.First of all,build the main circuit structure of HRTAPF,analyze the circuit characteristics,and obtain equivalent circuit and mathematical model;secondly,design and analyze the parameters of various components in HRTAPF;then,based on the two critical points of harmonic detection and control strategy in the HRTAPF system,design the harmonic detectionmethod and its control strategy of system.By combininggeneralized integraland discrete sliding mode variable structure control algorithm,establish compounddiscrete sliding mode variable structure control strategy to conduct real-time control of HRTAPF.Conduct theoretical analysis and simulation experiment of various parts and links to prove the feasibility and reasonability of this scheme.Finally,use the MATLAB simulation software to conduct simulation experiment of the overall filter performance of HRTAPF system.Conduct simulation experiment under the two conditions of stable impedanceand volatile impedance of grid system respectively,and compare the simulation results of HRTAPF system and the static filter PF,which proves that HRTAPF has better dynamic and static filter performance with broader scope of application.