Passive harmonic filter for power distribution systems

摘要

A subsea power distribution system includes a three-phase AC power source; multiple variable frequency drives having inputs and outputs, with their inputs connected to the AC power source; an electric motor connected in series to the output of each variable frequency drive; and a passive harmonic filter system having its input connected, in parallel with the variable frequency drives, to the AC power source. The filter system includes multiple harmonic filters, each harmonic filter tuned to a specific harmonic frequency. Each harmonic filter includes a plurality of sub-filters. Each sub-filter includes a reactor connected in series to a main capacitor and one or more detuning capacitors. Each of the multiple harmonic filters is tuned to a different specific harmonic, and includes sub-filters also tuned to the same respective harmonic, and each sub-filter is sized to equally share the kVAR load of its respective harmonic filter.

主权项

1. A power distribution system comprising:
a power source; a switchgear in electrical communication with the power source; a passive harmonic filter system having its input connected, in parallel with at least one variable frequency drive, to the switchgear, the filter system comprising multiple harmonic filters, each harmonic filter tuned to a specific harmonic frequency, each harmonic filter comprising a plurality of sub-filters, each sub-filter comprising:
a circuit breaker/switch connected to the power source;a reactor connected to the circuit breaker/switch; anda main capacitor and one or more detuning capacitors connected in series to the reactor such that a current flowing through each sub-filter is reduced by the one or more detuning capacitors; and an electrical submersible pump system comprising an electric motor connected to at least one variable frequency drive.