Impact of power quality on electricity consumption
in the steel industry
The electricity consumption of steel enterprises is characterized by large capacity, large load impact, frequent starting and braking, rapid operation and a high degree of automation. The operation of metallurgical equipment such as rolling mills, welding equipment, steelmaking arc furnaces, etc. will cause reactive power fluctuations, low power factors and excessive harmonic content, which will not only cause grid voltage distortion but also may cause resonance of the grid at certain frequencies. These problems must be solved. Xixing Technology provides professional power quality management solutions that can efficiently solve power quality problems in the steel industry and create a green, healthy, safe and stable power environment.
Where do harmonics in the steel industry come from?
Steel enterprises use a large number of DC motors and converter drives, AC motor frequency conversion speed drives, power electronic devices and other nonlinear loads, rolling mills, arc furnaces and other metallurgical equipment, which cause a three-phase imbalance in the power grid, low power factor of the power grid, excessive harmonic content and other problems, which seriously endanger the safe operation of the power system and the safe and economical operation of electrical equipment.
Pain points of power quality in the steel industry
Rolling mill: Harmful characteristic harmonics will be generated in the transmission device of the load, mainly odd harmonics represented by 5th, 7th, 11th and 13th harmonics. At the same time, frequent starting will cause the power factor to decrease. Due to the skin effect and proximity effect of harmonics, the cable heats up, the transformer noise increases, and the loss increases; harmonics may also cause oxygen production equipment to trip, switch malfunction, motor burnout, frequency conversion equipment to trip, protection device malfunction, generator rotor heating and other hazards.
Arc furnace: When the arc furnace is working, voltage fluctuation and flicker are generated, the reactive power generated by the load changes greatly, the power factor decreases, causing three-phase imbalance, and many harmonics, mainly the 5th, 7th, 11th, and 13th characteristic harmonics. It can cause torsional oscillation of nearby large units and voltage fluctuations in the power system grid.
Solutions for the steel industry
EasyPQ-APF series active filters of Xixing Technology can control 2nd-50th harmonics, and the harmonic filtering rate of low-order harmonics (harmonics within 13th order) can reach more than 95%; EasyPQ-SVG series static reactive generators are suitable for complex reactive compensation occasions, which can well compensate reactive power and adjust three-phase current imbalance problems, with a response time of less than 10ms, comprehensively improving the power quality of the system and ensuring the safety of users' electricity use.
