Study On High Precision Magnet Power Harmonic Suppression Method Based On Fuzzy Logic

Now, With the widespread application of power electronic technology in power system, A large number of nonlinear devices are used in the magnet power, make the power grid harmonic(thyristor phased rectifier on the DC side of 12 pulse potter ripple and due to the asymmetry of input voltage, rectifier trigger angle, device features not ideal of reasons such as the characteristics of the ripple) worsening pollution seriously affect the stability of the current of the magnet power, great harm the safety of power supply equipment. To solve the problem of the harmonic pollution,introduces the harmonic suppression tool active power filter(APF). Today, APF as the most ideal tool to suppress harmonic wave, widely attention.In this thesis, on the premise of existing power magnet power harmonic governance, based on the current state of research of harmonic analysis and scheme comparison of various harmonic research, put forward a kind of effective method to suppress harmonic governance. Firstly, article introduces the magnet of harmonic wave in the power source and the harm of the power generating, purpose of harmonic governance is put forward, and then through the research status at home and abroad and the details about the current harmonic treatment method, the principle of response devices and their advantages and disadvantages, put forward the suppression method--fuzzy adaptive PI control in the application of active filter in this paper, the method for simulation, comparison, and further optimization, The combination of zero phase-shift low-pass filter and active filter harmonic filtering, based on the zero phase-shift low-pass filter to eliminate the high frequency harmonic and the advantages of no delay output, through the various output of zero phase-shift low-pass filter, harmonic detection device and the active filter graphic simulation, observe the deficiency existing in every link and optimized respectively, eventually improve the suppression method. Waveform quality can be judged by observing the nonlinear load current used in this paper, harmonic suppression method can better suppress harmonic and prove the validity and superiority of the proposed method, can improve the stability of the nonlinear load current in the magnet power supply, make the magnet power supply can run normally, to ensure the efficient working of the particle accelerator(due to the stability of the magnet power supply current determines the trajectories of particles in particle accelerators) and better application in all walks of life.