矿热炉不平衡状态下的基波电流检测方法研究

Research on detecting method of fundamental currents for unbalance submerged arc furnace

矿热炉系统是典型的负载不对称三相系统,在运行时会产生负序电流同时伴有电流幅值的波动。本研究方法首先应用对称分量法,将采集到的三相电弧电流进行分解,然后对三相对称分量进行d,q变换,最后通过滤波器提取基波分量,达到对矿热炉系统基波电流检测的目的。通过建立的矿热炉电气模型在Simulink软件下仿真,验证了本方法可行,能够准确检测出矿热炉系统的基波正序和负序电流,为矿热炉谐波抑制与补偿系统的设计提供可靠参考。

Submerged arc furnace system is a typical three-phase system of asymmetric load, during the run-time negative sequence current will be produced by fluctuations in current amplitude. In this paper, firstly using symmetrical component method to decomposition of three-phase arc current being collected, then the three-phase symmetrical component which have obtained carries on the d, q transformation, finally through the filter extracts the fundamental component, achieves to the purpose of detecting fundamental current with submerged arc furnace system. Through the establishment of system simulation models in Simulink, it verified the method is feasible and can accurately detect the fundamental positive sequence and negative sequence current of the submerged arc furnace system, it provide a reliable reference for the submerged arc furnace harmonic suppression and the design of compensation system.