Research On Shunt Active Power Filter Based On Control Strategy Of Source Side Current

Because of the rapid development of the power electronic technology,the power electronic equipment quickly spread in many areas,which can produce a large number of harmonic and reactive current in the grid.At present,the problem of quality of power is becoming focus of research.This paper firstly introduces the subject research background,and it expounds the urgency and necessity of eliminating harmonic current.Then it introduces the principle structure and classification of active power filter.And the commonly used methods of harmonic detection and control methods are also introduced.On this basis,it also compares the merits and demerits between Passive Power Filter and active power filter.In connection with three phase-three wire balance load system,this paper uses the method of the source current detection because of the complexity of detecting ip-iq with the instantaneous reactive power theory.The simulation results prove the feasibility and validity of the method.In connection with three phase-four wire unbalance load system,this paper uses the method above.The structure of split capacitance is used in the main circuit.It also adopts the capacitor voltages controller based on the adaptive fuzzy PI control.In addition,this paper provides the capacitor voltage by the side of DC,IGBT parameters,radiator and inductance by the side of AC choice calculation method.At the same time,it designs the master control circuit,including the multiplying unit,Triangle wave modulation circuit,the filter circuit of supply voltage and the dead zone control circuit,etc.The designed circuit is also simulated and debugged.This paper builds active power filter model based on the power system software module from the MATLAB/SIMULINK,and simulates dynamically.The simulation results show that the active power filter has good effect on the harmonic suppression and reactive power compensation.Especially in the compensation of unbalanced load system,this APF eliminates the zero sequence current.In the way of three-phase balanced current,the control is easier.The degree of three-phase balance is better compared with conventional methods of active power filter.This paper makes a preliminary experiment for active power filter based on the theory analysis and simulation research.Experimental results verify the availability of the source side current control method in the application of active power filter.