A power source system, which comprises a converter for converting AC power on an AC bus into DC power, a damped filter connected between the AC bus and ground and including a capacitor and an inductor, a diode-rectifying circuit for taking out and rectifying fundamental and harmonic waves produced across the inductor in the damped filter and a circuit for connecting a DC output circuit in the diode-rectifying circuit in series with a DC output circuit in said converter, and in which the rectified output is regeneratively added to the output of the converter.

Power source system

A power distribution system includes an ac power source; a power bus connected to the ac power source; a capacitor bank shunt-connected to the power bus; and an active filter shunt-connected to the power bus. The active filter includes current sensors, an inverter and an inverter control. Each current sensor senses current flowing through a corresponding capacitor of the capacitor bank. The inverter control, in response to the current sensors, controls the inverter to inject harmonic currents into the power bus.

Active filter for power distribution system with selectable harmonic elimination

AC to DC converters used in high-voltage direct-current power transmission lines produce objectionable harmonics. The composite filter herein described is actively tuned for the eleventh and thirteenth harmonics in addition to providing a low impedance path for the higher order harmonics, thereby eliminating such undesired harmonics so that they will not be transmitted over power lines where they can cause telephone interference, undesired heating of electrical equipment and other difficulties.

Composite filter for suppressing harmonic frequencies on electric power transmission lines

Circuit for the compensation of harmonic currents in a network, including a wideband highpass filter having a choke connected in parallel with a damping resistor and a capacitor connected in series therewith, and a harmonic converter connected to the highpass filter.

Circuit arrangement and method for the compensation of harmonic currents

The invention relates to a ship with electrical propulsion, whereby a reduction in the distortion factor in the medium voltage network is achieved. The above is achieved by means of connecting two power converters or groups of power converters together such as to appear to behave like a 24-pulse power converter to the network. The power converters, or groups of power converters as above are loaded differently or have differing dimensions in the DC intermediate circuit thereof.

Marine propulsion system with reduced on-board network distortion factor

An improved filtering arrangement for a converter circuit in which a highpass filter, tuned to have a cutoff frequency which is less than the lowest harmonic to be filtered is provided instead of the customary plurality of filters tuned to individual harmonic currents. In a 12 pulse converter circuit, at least one highpass filter which is tuned to filter out harmonics starting with the fifth harmonic and which has a resonant frequency above the 11th harmonic is used.

Schraudolph M

Papers

Filter arrangement for a converter circuit

Filterkreisanordnung fuer eine stromrichterschaltung