Research on Starting Control Method of Well Electric Furnace Based on Electric Power Simulation Signal
The start-up process of a well type electric furnace requires a rapid increase in temperature to the set value to meet production needs.However,due to limitations such as furnace current and speed,the problem of large overshoot can occur.In order to reduce the over-shoot of the start-up control of a well type electric furnace,a start-up control method based on electric power simulation signals is proposed.The power regulator uses a signal collector to collect analog signals of shaft furnace speed and current,and converts them into digital signals through an A/D conversion unit;The microprocessor utilizes incremental proportional,integral,and derivative(PID)control technology,combined with digital signals,to output the start-up control signal of the well type electric furnace;After receiving the start control signal of the well type electric furnace,the thyristor driving unit drives the AC thyristor,adjusts the conduction angle of the thyristor,and starts the well type electric furnace;Utilize a current detection unit to detect the starting current of the well type electric furnace in real-time.When the starting current is too high,use an overload/short circuit protection unit to turn off the thyristor and prevent it from overheating and damage;When the starting current is normal,use it to restore the well type electric furnace starting control function of the power regulator.The experi-ment proves that this method can effectively achieve the start-up control of the well type electric furnace,and the start-up process of the well type electric furnace is stable;When a sudden load is applied,the overshoot of the starting control of the well type electric furnace in this method is small,and it has better starting control performance of the well type electric furnace.
power regulatorwell type electric furnacestart controlintelligent instrumentincremental PIDthyristor