Research On The Application Of Fundamental Magnetic Flux Compensation-type Series Hybrid Harmonic Suppression Device

As traditional nonlinear electrical equipment and modern power electronics technology widely used, a lot of harmonics are produced in the power system. Series Hybrid Active Filter (SHAPF) is an effective harmonic suppression device. Based on Fundamental Magnetic Flux Compensation-type SHAPF is first derived from the theory of controlable magnetic flux reactor. Based on the research of predecessors on the fundamental magnetic flux compensation-type SHAPF, in-depth theoretical analysis about the fundamental current compensation coefficient of SHAPF is done and further perfected the theory of fundamental magnetic flux compensation in this thesis.An approximate mathematical formula to calculate the value range of fundamental current compensation coefficient of SHAPF is derived in this paper, which can reveal the intrinsic relationship among the fundamental current compensation coefficient, the system current, transformer magnetizing impedance and the voltage of DC bus. A large amount of simulation proves its correctness. This is a useful innovation.Meanwhile, some experiment is done to verify the conclusions of theoretical analysis. Experimental platform of SHAPF(20kVA) is built by using Mitsubishi IPM module (three-phase voltage type DC/AC inverter bridge) as the main circuit switching device, and using TMS320F2812 DSP as digital control core. The design of software and hardware is showed. Experimental result further proves the correctness of theoretical analysis, which can play good engineering practice guidance.After finishing a large amount of experiments, the current decoupling control strategy of SHAPF is analyzed emphatically. And the unified mathematical description of voltage space vector PWM control strategy (SVPWM) is summarized. The current decoupling method is used with a combination of SVPWM control strategy in SHAPF, then simulation analysis is done which shows this program have obvious advantages than the current decoupling of the SPWM control strategy, this is the second innovation in this thesis.