Research On Harmonic Current Detection Of Active Power Filter In Rural Power Distribution Area

Power electronics technology has gone through the long-term development of increasingly mature,in which the representative application is the wide application of linear and nonlinear equipment,but in the process of using a large number of harmonics will lead to a decline in the quality of power supply,the decline in the quality of power supply will not only affect the city,but also pose a threat to the countryside,therefore,In this paper,the harmonic Problem of agricultural network is analyzed,and it can be concluded that the best way to solve the harmonic problem of agricultural network is to use active power filter,the function of active power filter is to detect and track harmonics effectively.As a powerful means to overcome harmonics,many scholars have aroused the upsurge of active power filter research.After the early investigation of relevant references at home and abroad,this paper focuses on the origin,development level and status of APF.This paper first expounds the relevant categories of APF,and then draws the topology diagram.and the working principle of APF is expounded.Then,the main circuit using parallel APF method is introduced emphatically,and the related control scheme is expounded.Finally,the LCL filter is analyzed and introduced in detail.Secondly,how to detect harmonic current quickly and accurately is the core of the research problem,based on this,this paper gives a brief introduction to various harmonic detection methods In this paper,the p-q detection algorithm based on instantaneous reactive power theory and the ip-iq detection algorithm are compared and analyzed.Thirdly,this paper uses the SIMULINK in MATLAB to build the simulation module,through the analysis of the simulation model,then tests the proposed harmonic detection method and control strategy,and finally in the case of different kinds of grid voltage analysis and discussion of these two detection methods.Finally,it is concluded that using the ip-iqdetection method mentioned in this paper can really play the goal of harmonic compensation.Finally,the experiment is carried out on the test platform of the parallel APF of the main control chip,and its related control strategy is expounded,and then the strategy is programmed,and the conclusion is finally drawn.