| High-quality power supply has become a necessary condition for normal production and life in modern society. Many power quality problems, including transient over-voltage, voltage sags, harmonics and other power problems are becoming more serious than before. This thesis proposes a new parallel-type voltage sag recovery multi-objective control device main circuit topology to this problem. In analyzing the device principle, typical system voltage quality problems such as voltage sag compensation algorithm and control is provided. The continuous voltage sag compensation, the effective use of DC voltage, low-pass filtering and other issues is solved. The parallel-type dynamic voltage multi-objective control device simulation model is established based on PSCAD/EMTDC simulation software. The simulation waveform of voltage rise temporarily and sag, current harmonics, reactive power compensation and short current limited is given. This thesis proposes a full compensation method, zero active power injection method and the minimum apparent power injection method. Finally full compensation method is adopted for parallel compensation, Physical experiment waveform of the harmonic suppression and reactive power compensation is given. Simulation waveform and results verify the correctness and validity of the proposed main circuit topology and control strategy. |
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