Abstract
Because the harmonics in the production process of copper electrowinning have an important impact on the electrical energy consumption, it is necessary to suppress the harmonics effectively. In this paper, a copper electrowinning rectifier with double inverse star circuit is selected as a study object in which a large number of harmonics mainly including the 5th, 7th, 11th, and 13th harmonics are generated and injected back into the power grid. The total harmonic distortion rate of the power grid is up to 29.19% before filtering. Therefore, a method combining the induction filtering method and the active filtering method is proposed to carry out comprehensive filtering. Simulation results demonstrate that the total harmonic distortion rate of the system decreases to 4.20%, which indicates that the proposed method can track the corresponding changes of harmonics when the load changes in real time and filter them out. In order to ensure and improve the effect of active filter, a current harmonic tracking control method based on linear active disturbance rejection control is proposed. Simulation results show that the total harmonic distortion rate decreases to 3.34%, which is also lower than that of hysteresis control. Compared with the conventional single filtering method, the new filtering method combining induction filtering with active filtering based on linear active disturbance rejection control in the copper electrowinning rectifier has obvious advantages.
Highlights
In recent years, copper and its alloy materials are widely used in various fields, and the demand of copper is increasing in many enterprises
After a period of 0.16 s, the total distortion rate of the system decreases to 3.76%, which indicates that the filtering system can track the corresponding changes of harmonics when the load changes in real time and filter them out
Since the induction filtering method can meet the requirements of the total harmonic distortion rate after filtering and the active power filtering method can meet the requirements of tracking and filtering the harmonic changes in real time when the load changes, in order to effectively suppress a large number of harmonics mainly including the 5th, 7th, 11th, and 13th harmonics generated during operation of a copper electrowinning rectifier with double inverse star circuit, firstly, Firstly, this paper proposes a method combining the induction filtering method and the active filtering method to carry out comprehensive filtering
Summary
Copper and its alloy materials are widely used in various fields, and the demand of copper is increasing in many enterprises. A large number of harmonics are injected back into the power grid, which will directly affect the quality of copper production. Liu et al [13] proposed a novel controllable inductive power filtering (CIPF) method to effectively eliminate the harmonics flowing through the transformer in the industrial DC power supply system. In [16], an impedance reconstruction control method for the source PWM inverter was proposed, which improves the phase of the output sequence impedance of the source PWM inverter at high-frequency areas to effectively suppress the high-frequency oscillation of the island power system. Wiechmann et al [18] proposed an optimized sequential control technique to improve converter's reactive power consumption presentation for copper electrowinning high-current rectifiers. The LADRC technology is added to the active filter current tracking control in active filter, which further improves the harmonic suppression effect
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