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DC link reactor are http://www.controldesign.com/assets/_images///CD-VACON-Pros-Cons.jpg
DC link reactor are the connectors between the diodes and the DC bus and can be slightly effective at removing harmonics than AC line reactors depending on the order of harmonic being observed. DC link reactors are typically smaller than AC chokes and they add the necessary impedance for harmonic reduction without a drop in voltage.
The purpose of a DC-link reactor is to reduce the harmonic currents on the DC side of the converter and to reduce the risk of commutation failures by limiting the rate of rise of the DC line current at transient disturbances in the AC or DC systems. Small losses and small size and weight in relation to capacity are typical features for smoothing reactors.
