Research On Harmonic Suppression Of Shunt Hybrid Active Power Filter

With the development of modern industrial technology, a large number of non-linear power electronic equipments are applied widely in power system, which causes too much harmonic pollution. At the same time the power quality and the safe operation become worse sharply. Hence, harmonics suppression is imperative under the situation. The both Active Power Filter (APF) and Passive Filter (PF) have disadvantages. But the Hybrid Active Power Filter (HAPF) composed of Passive Filter and Active Power Filter can have their advantages and eliminate their disadvantages. It possesses the characteristics low price of Passive Filter and good performance of Active Power Filter. So it is practical significance to research on the Hybrid Active Power Filter.In this paper, the object of study is three phase Shunt Hybrid Active Power Filter (SHAPF).First, the dissertation introduced the related concept, production mechanism, researching significance of harmonics and the present researching situation of the hybrid active power filter, analyzed in detail the basic principles, compositions and classifications of passive filters and active power filter, compared the advantages and disadvantages for each kind of filter, and hybrid active power filter has been analyzed.Second, the dissertation mainly analyzed ip-iq harmonic detection method based on the instantaneous reactive power theory, and proposed an adaptive detection of instantaneous reactive power theory. Introduces some compensation current control method, and presents a composite DC voltage control method to improve the control precision of the hybrid active power filter and improve the performance considerably. In this paper, the design method of passive filter is discussed in depth. And based on the traditional methods, proposing improved genetic algorithm, the design of passive power filter is solved by multi-objective optimization. It develops software about the design of passive power filter parameters, so that makes the parameters of passive power filter design easier.Finally, the components of the shunt hybrid active power filter system are modeled and simulated with MATLAB software. The simulation results show that the shunt hybrid active power filter can detect the harmonic current, and effectively compensate harmonic current for the power system waveforms with serious distortion. The system remains sinusoidal current waveform to achieve satisfactory harmonic suppression. Theoretical analysis and simulation results verify that the study of the shunt hybrid active power filter is effective and feasible. The studies in the dissertation have some guidance in the field of the exploitation of the shunt hybrid active power filter system.