Research On Harmonic Detection And Control Strategy Based On DSP Active Power Filter

With the mature development of DC transmission and flexible transmission,the application of power electronics technology is more common.At the same time,the application of various nonlinear loads has caused harmonic problems to become an important and common research topic in transmission technology.Therefore,the harmonic problems has been soved with the Active Power Filter(Active Power Filter,APF),which has become a key measure.The active power filter can suppress and eliminate various harmonics generated in the power grid and improve the current waveform in the power line.This thesis starts with the harm of harmonics,describes the concept,generation and treatment methods of harmonic problems,and then elaborates the working principle and classification of active power filters,and introduces the research status at home and abroad.This article focuses on the study of hannonic current detection methods and control strategies for active power filters,and introduces current harmonic detection theories and current tracking pulse width modulation methods.Comparing various kinds of harmonic detection methods and control strategies,this project through the ip-iq instantaneous reactive current detection method and p-q detection method in-depth analysis,built a matlab/simulink simulation model and obtained the corresponding simulation Waveforms,the lack of p-q detection method in the case of distortion voltage.In this paper,the active power filter composed of Space Vector Pulse Width Modulation(SVPWM)is studied in detail,and a simulation model is also set up.Together with the detection simulation model,the overall structure of the active power filter is formed.The simulation analysis shows that The influence of the main circuit inductance size and load resistance magnitude on harmonic compensation.Through the digital signal processor TMS320F28335 as the main controller,hardware design and software design were carried out,including main circuit design,current and voltage sampling circuit design,drive and protection circuit design,phase-locked loop circuit design,and power supply circuit design.Using CCS6.0 development environment and YXDSP-XDS100V3 USB emulator for data processing and development,using the theoretical method of ip-iq harmonic current detection to detect power grid harmonics and using the obtained data using the principle of space vector pulse width modulation(SVPWM)to obtain the waveform Compensate to restore the sine wave that the system normally needs.A Simulink simulation model was built to complete the simulation of the method,thus confirming the feasibility of this method.Combining the simulation results,a simple laboratory experiment was conducted to basically verify the filtering effect.