Abstract:
The invention relates to a driving mechanism for components of industrial installations, in particular for primary industry installations. The mechanism has at least one electric motor and at least one converter with driving mechanism variable-voltage link, via which the electric motor is connected to an alternating voltage energy supply network. The converter regulates the active power input and/or the torque and rotational speed of the electric motor from the alternating voltage energy supply network.
Abstract:
The invention relates to a driving mechanism for components of industrial installations, in particular for primary industry installations. The mechanism has at least one electric motor and at least one converter with driving mechanism variable-voltage link, via which the electric motor is connected to an alternating voltage energy supply network. The converter regulates the active power input and/or the torque and rotational speed of the electric motor from the alternating voltage energy supply network.
Abstract:
A semi-conductor system for controlling three phase motors by voltage and/or frequency variations. An input circuit (14) provides dc power, such as a three phase full wave input bridge (28) with silicon control rectifiers (24) to provide a voltage controlled dc power output. An output inverter bridge (20) having six silicon rectifiers (34) receives dc power and converts it to three phase ac power for operating motor (12). A diverter network (18) is connected between the dc power input circuit (14) and the output inverter (20) and is activated periodically for temporarily diverting the dc power from the inverter (20) in order that the inverter rectifiers (34) may be turned off. The diverter (18) may include a tank circuit (42, 44) having a capacitor (42) and an inductor (44) connected across the dc power output through a diode (46) and a silicon control rectifier (50) is connected to the tank circuit (42, 44) for shunting the dc power from the inverter (20) and applying a reverse voltage to the inverter (20). A harmonic suppression circuit (22) is connected across the output of the inverter (20) and may include a capacitor (72) connected between each of the three phase output lines (36, 38, 40) of the inverter (20).
Abstract:
A wind farm side voltage source converter (32; 94) comprises a DC terminal (40) for connection to a DC transmission link (38), an AC terminal (42) for connection to a wind farm (44) that includes at least one wind turbine (46), and a main controller (10; 20; 96). The main controller (10; 20; 96) is configured to modify an active power demand (P demand ) of the voltage source converter (32; 94) which is received from a higher level controller by introducing an artificial inertia factor and/or in response to a measured DC voltage (V dc_msr ) at the DC terminal (40).
Abstract:
In einem Verfahren zur Reduzierung von Las tabwurf -Überspannungen beim Betrieb eines Synchrongleichrichters (29) für einen mehrphasigen Wechselstrom mit einer Anzahl von Eingängen (60.1 bis 60.5), die der Anzahl von Wechselstromphasen (A bis E) des Wechselstroms entspricht, und wenigstens zwei Ausgängen (Β+, B-) zur Bereitstellung eines Gleichstroms, wobei an jeden Eingang (60.1 bis 60.5) jeweils eine Wechselstromphase (A bis E) angeschlossen und nach Maßgabe von Steuermitteln jeder der Eingänge (60.1 bis 60.5) elektrisch wahlweise durch aktive Schaltelemente (MOSFETs, IGBTs) entweder mit dem ersten (B+) oder dem zweiten (B-) Ausgang verbunden wird.
Abstract:
A three-phase regenerative drive (20) is operated based upon power from a single-phase AC source ( 12) and power from a DC source (14). The single-phase AC input power and the DC input power are converted to DC voltage on a DC bus (24) by a three-phase converter (22). DC power is provided from the DC bus (24) to a three-phase inverter having outputs connected to a motor (34). A controller (44) controls operation of the three-phase converter (22) based upon contribution factors of the AC and DC sources ( 12, 14) during motoring and regeneration. The controller (44) also controls an AC component of current from the DC source to reduce ripple current on the DC bus (24).
Abstract:
Systems and methods for improved Variable Speed Drives having active inverters include an input filter for filtering common mode and differential mode currents. A three-phase inductor has three windings, each winding of the three-phase inductor having a center tap dividing each winding into a pair of inductor sections; and a three-phase input capacitor bank connected in a wye configuration to the three center taps at one end, and to a common point at the opposite end. The three-phase input capacitor bank provides a short circuit for frequencies above a predetermined fundamental frequency for shunting such frequencies through the three phase capacitor bank, while passing the predetermined fundamental frequency to an input AC power source.