Research On Active Power Filter In Reactive Power Compensation And Harmonic Restraining

With the development of the electronic technology and the extensive apply of the power electronic device,Higher requirements about using and quality of power are put forward.Active Power filter(APF) is considered as the most effetive method to harness the serious "power pollution".It is a developmental tendency of utilizing APF compensating harmonic current and idle-current.In order to minimize the capability and production costs of APF,a novel topology of shunt-hybrid active power filter is put forward.The main research content are as followed:First,The paper researchs the impedance characteristics of LC Passive filter and its affect about reactive power compensation,and derives the method of calculation parameters.Analyze the basic principles of APF,including classification and impedance characteristics,the basic structure and working Principle about all kinds of APF(shunt,series,hybrid).In connection with the most widely used and most effective APF currently,the paper Focuses analysis and researchSecond,Rapid,accurate detection of harmonic current,harmonic voltage, reactive current signal of active power filter is to achieve one of the keys.Various methods in this chapter first to make a brief introduction,on base of the analysis of harmonic detection technique,focus based on instantaneous reactive power theory of current detection technology in the voltage when the detection of the existence of asymmetric error analysis,an improved harmonic current detection method.Third,Analyzes Harmonic source load of reactive and harmonic,expound on parallel hybrid active power filter operating principle.A three-phase shunt active power filter of the experimental device has been designed,TI chip companies TMS320LF2407A for the control of DSP core acts the control system,Based on instantaneous reactive power theory of harmonic detection methods and voltage space vector control method.Control circuitry includs digital control circuit(DSP),signal acquisition circuit and the drive control circuit,harmonic detection and control algorithms through software programming.Last,The paper also researchs a new hybrid active power filter.Such a fundamental series resonant filter,the compensation principle and the capacity to reduce some of the characteristics of active,has a good filtering properties,and dosen't bear the active part of the fundamental voltage,which reduces the capacity, cost savings and the use of simulation soft-ware to build simulation models and receives simulation results.The results prove that this topology of the hybrid system can effectively reduce the active part of the capacity,it is more suitable occasions in the high-power applications...