Steel and aluminum smelting are energy intensive processes. Smelting is carried out with disturbing loads, mostly Electric Arc Furnaces. Electric Arc and other types of furnaces frequently cause power quality problems, including voltage variations, flicker, poor power factor and harmonic distortions. Poor power quality means longer melt time, lower productivity, energy losses and higher operating costs. If steel plants are connected to weak grids and fail to operate at full power or in daytime, production capacity is affected. Rolling mills may face similar power quality issues. Moreover, where steel plants are connected to the public grid, their operation may disturb any customers connected to the same bus.
The key benefits of improving power quality in Steel and Metal industry include:
Mining and mineral plants are typically located in remote areas far from power generation plants. Power is distributed through long overhead lines, which may stretch up to hundreds of kilometers, weakening grids and lowering the fault levels. Power quality issues arise when a weak network is used to feed large winders, sag mills, or other heavy mining loads. When the heavy motors are started, arising flicker and voltage sags may disturb other loads in the plant. Voltage sag may also significantly reduce motor torque and thus affect productivity. Even if mining plants are operated on capacitive power plant, additional gensets are needed to keep the short-circuit level higher resulting in higher operational costs. Another major concern in mining plants are high harmonic distortions caused by DC, Cycloconverter and VSD drives. This kind of power quality problems will damage capital mining equipment and obstruct the continuity of mining processes.
The key benefits of improving power quality in Mining, Mineral and Cement industries include:
Isolated power grids are typically weak and commonly found in marine, oil & gas and mining applications. Large and dynamic loads on isolated power grids with low fault level cause numerous power quality issues, including higher harmonic distortion, flicker, rapid voltage variation and poor power factor. Such power quality problems lead to frequent breakdowns of sensitive electronic equipment, energy losses and even costly blackouts. To increase the short-circuit level, conventional solutions, such as running additional gensets, require additional investments and higher recurring costs in terms of fuel and engine maintenance. Also, conventional solutions do not reduce high harmonic distortion produced by non-linear loads on isolated grids.
The key benefits of improving power quality in isolated power grids include: