Merus Active harmonic filtering technology can be applied to wide range of industrial or commercial environments where good power quality is essential. Merus active harmonic filters have been used for the processes that use Variable Speed Drives (VSD), fast fluctuating loads such as welding machines, Uninterrupted Power Supply (UPS) systems and DC load, single phase loads such as lighting and computers as well as electric arc furnaces and rolling mills.
Merus active harmonic filters are connected in parallel with the loads to be compensated. They measure the current of the non-linear load and inject the same harmonics, but with opposite phase angle. The current of the active harmonic filter thus cancels out the harmonic currents of the load, and only fundamental frequency current component is left to be supplied from the power system.
In addition to current and voltage profile smoothing by harmonic current mitigation, the active filters also provide fast fundamental frequency reactive power compensation and balance loads in three-phase systems. Reactive power compensation stabilizes voltage, mitigates flicker, releases additional capacity for transferring more active power in the existing electrical network and improves the power factor. Fast response to reactive power changes is important, for example, in electric arc furnaces. A typical case where load balancing is needed is a phase-to-phase connected welding equipment that burdens only two of the three lines and can thus create voltage unbalance between the phases.
January 12, 2018