Research On The Parallel Hybrid Active Power Filter Based On DSP

Active power filter is considered as the most effective method to harness the serious "power pollution", it is also an advanced power electronic device, which has many advantages and favorable prospects compared with some conventional measures. Research and application are widely studied.The compensation principle of the traditional shunt type active power filter is discussed, which can show that it is only used to compensate the harmonic current source. Considering the weakness, the investigated subject of the project is proposed, which is a simplified shunt type hybrid active power filter. The operating principle, mathematical modeling and the compensation characteristics of the subject are discussed in detail. In addition, the determination method of the main parameters is deduced, which can provide the theoretical basis for the design and implementation of the prototype. The thesis introduces two kinds of real time harmonic and reactive current detection methods, which are base on instantaneous reactive power theory. A new harmonic harmonic and reactive current detection method and a harmonic current detection method base on bandpass filter are introduced in this thesis. Shunt active power filter's control strategy including compensatory current control and DC voltage control is analyzed in detail. Compensatory current control adopts triangle wave compare control, and DC voltage control adopts PI closed loop control.The thesis introduces shunt active power filter system 's hardware and software design with TMS320LF2407 DSP. Hardware and software's structure and function are described in detail.The thesis makes the simulation for shunt active power filter system, The proposed harmonic and reactive current detection method and the control strategy of shunt active power filter are tested. And satisfactory result is drawn. The simulation results verify validity and effectiveness of the current detection method and the control strategy.