电弧炉电气系统的谐波及波动的检测方法研究

Research on detecting method of harmonic and undulate for electric arc furnace

电弧炉系统是三相不对称系统 ,在电弧炉运行时会产生负序电流 ,同时伴有电流幅值的波动。因此 ,在对电弧炉系统进行谐波抑制时 ,也要考虑对负序电流的抵消和对电流波动的抑制。采用对称分量分解法先将电弧电流进行分解 ,然后再经过一系列的变换并利用滤波器提取基波分量进行检测的方法 ,对电弧炉系统的电流进行检测。通过理论分析及仿真实验表明 ,该方法能准确地检测出电弧炉系统的谐波。

The electric arc furnace is asymmetrical three_phase configurations,it can produce negative current and undulate in its current amplification.So,counteracting negative current and restraining current′s undulate should be considered. A method is adopted to decompose current and pick_up the fundamental current by using filter.The method is depicted detail_edly. The result indicates that the method can check_ out the harmonic, undulate and negative current of electric arc furnace.