The reactive power regulation method uses a reactive power compensation device inserted between a generator driven by a wind-turbine and the electrical energy network and regulated for supplying electrical power to a load which has a reactive load componen...

A method in connection with a network inverter, an LCL network filter (3) being connected between the network inverter (1) and network (2), and the network inverter being arranged to operate as an active converter of harmonic components of electricity, and...

The invention provides techniques for reducing or altering the magnetic noise of an AC rotary electric machine. A magnetic noise reducing harmonic current of order n, whose frequency is n times the frequency of the fundamental frequency component of a poly...

The device has a drive unit coupled to a generator and connected via a rectifier to a d.c. intermediate circuit, a static converter connected to the intermediate circuit with multiple a.c. output connections and a filter arrangement connected to the a.c. o...

A power converter circuit for voltage maintenance in an alternating voltage supply network (1) is specified, wherein the alternating voltage supply network (1) has for each phase (R; S; T) an associated voltage source (UR; US; UT) for supplying an electric...

The circuit has a capacitance in parallel with the load, a single- or multi-phase transformer with a secondary in series with the capacitance and a main inductance selected to form a passive filter circuit for at least one harmonic, a current regulated sin...

A "PN junction element ta which produces the Peltier effect and Seebeck effect within the same element and imparts a noise reducing effect," which prevents an adverse influence of white noise included in an AC waveform to be supplied from a commercially av...

A tuned filter for connection to a busbar in a high voltage electric power system. The filter incorporates a variable inductor (2); the variable inductor (2) comprising a main winding (4), auxiliary windings (6-12) and switching means (14-20) associated wi...

The filter comprises a current-compensated choke (32), wound with three-phase conductors (L1, L2, L3); and a capacitive network (33, 34, 38). The neutral conductor (PEN) is not brought in through a choke, i.e. DC and AC earthing are maintained. Choke and c...