| The problems of harmonic pollution are worsening with the wide application of building automation technology in the intelligent building. The effects of harmonic pollution can lead to the decline of power quality and power factor. Therefore, the problem of electrical harmonic suppression in intelligent building has become one of focus of attention. The electrical harmonic suppression of intelligent building is studied deep in this paper. Firstly, the basic knowledge of harmonic is introduced briefly. The passive filters and active filter are compared on the basis of harmonic knowledge in order to explain its advantages and disadvantages. Secondly, the harmonic current detection method is determined based on the current average according to the characteristics of the existed harmonic current detection method. And the harmonic current detection method is simulated by the corresponding module in MATLAB. Thirdly, the controlling modes of harmonic current are studied comparatively. The controlling modes include the two aspects of the power current controlling mode and the load current controlling mode. The composite controlling mode is used by comparative characteristics of the above controlling modes. Simulation results show that the composite controlling mode has the better effect of harmonic suppression and good compensation characteristics. Lastly, the visual harmonic analysis software of the building supply and distribution system is built by Visual Basic language. The software has a friendly user interface. It is combined with MATLAB simulation. The software can provide theory reference and learn from to improve power quality for the management and users. |
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