Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1993-03-25
1995-08-22
Dougherty, Thomas M.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
H02M 112, H02M 114
Patent
active
054446090
ABSTRACT:
A Variable Frequency Drive Power Center incorporating a new passive Harmonic Filter in an improved housing structure for Variable Frequency Drives (VFDs). The new harmonic filter improves the overall system performance by drastically reducing the line side current harmonics generated by all VFDs. The harmonic filter includes a series inductance, a parallel capacitance, and a buck transformer. The filter provides a low impedance path for the harmonic currents generated by VFD and therefore prevents them from flowing into the input ac power lines. The filter also improves the input power factor of the VFD system because of its increased inductive reactance under full-load conditions. Although the filter causes an overvoltage across the VFD terminals because of its increased capacitive reactance at the fundamental frequency this problem is overcome by using the buck transformer. The power center includes a separate section for the harmonic filter and a set of vertically-disposed compartments for mounting a plurality of VFDs on sliding assemblies. This provides a more efficient use of space and ease of maintenance, service and inspection of each individual unit.
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Bisel Gerald R.
Rossiter Steven L.
Swamy Mahesh M.
Dougherty Thomas M.
Energy Management Corporation
Hollaar Lee A.
McCarthy Daniel P.
To E.
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