Abstract:
The present disclosure relates to a boost active bridge converter, which has particular, but not sole, relevance to a converter for an inductive or capacitive (wireless) power transfer system. According to an embodiment An AC-AC converter is presented. The AC-AC converter comprises a bridge circuit including at least two half-bridge converters, each half bridge converter comprising a first switch at an upper end and a second switch at a lower end, a capacitor connected to each half-bridge converter, the half bridge converters being connected to each other between the respective first switches and second switches thereof, the upper ends of each half bridge converters being connectable to a primary energy source, wherein the converter is operable to provide a controllable AC output.
Abstract:
An electrical power distribution network, including a plurality of electrical power control apparatuses, each including : Signal conversion components in order to convert the received signal to have a desirable signal having a second fundamental frequency and characteristic voltage; and a controller that controls operation of the signal conversion components to determine an output voltage and output frequency of the electrical power control apparatus; electrical power generation components acting as sources of electrical power and electrical power consumption components acting as sinks of electrical power to at least some of the electrical power control apparatuses; and wherein the electrical power control apparatuses operate autonomously but are interconnected such that an output of each of the electrical power control apparatuses is connected to an input of at least one corresponding electrical power control apparatus and to one or more of the sinks and/or sources of electrical power so that the electrical power control apparatuses collectively maintain the voltages and frequencies of electrical power signals.
Abstract:
A power converter comprising a converter for converting an AC power supply voltage into a DC voltage by rectifying the power supply voltage, a smoothing capacitor connected to the DC side of the converter, an inverter for converting the direct current of the capacitor into an alternating current and supplies the alternating current to an AC motor, and a means for controlling the voltage and frequency or phase of the AC output of the inverter, characterized in that the converter further comprises a means for adjusting at least one of the voltage, frequency, and phase of the AC output of the inverter based on a pulsating frequency component which is contained in the AC output of the inverter and produced when the converter rectifies the AC power supply voltage. Therefore, the beating phenomenon which is caused by the rectification pulsation is suppressed.
Abstract:
Die Erfindung betrifft ein Verfahren zum Betreiben einer Windenergieanlage (100) oder eines Windparks (112) mit mehreren Windenergieanlagen (100) zum Austauschen elektrischer Leistung zwischen dem Windpark und einem elektrischen Versorgungsnetz, wobei jede der Windenergieanlagen (100) eine oder mehrere Einspeisevorrichtungen (808, 810) aufweist, und die Windenergieanlage (100) bzw. der Windpark (112) über einen Netzanschlusspunkt (118) mit dem elektrischen Versorgungsnetz (120) verbunden ist und die Leistung über den Netzanschlusspunkt (118) ausgetauscht wird, wobei eine oder mehrere der Einspeisevorrichtungen (808, 810) als spannungsprägende Einheiten (808) arbeiten und eine oder mehrere der Einspeisevorrichtungen (808, 810) als stromprägende Einheiten (810) arbeiten, wobei insbesondere vorgesehen ist, dass die spannungsprägenden Einheiten (808) und die stromprägenden Einheiten (810) auch in einem ungestörten Betrieb des elektrischen Versorgungsnetzes (120) spannungsprägend bzw. stromprägend arbeiten.
Abstract:
Short circuit safe rectifier stage for a subsea power grid It is described a rectifier stage (251) for converting an input AC voltage to an output voltage, the rectifier stage comprising: a first AC input terminal (255); a second AC input terminal (257), wherein the input AC voltage is applicable between the first input terminal and the second input terminal; a first DC output terminal (267); a second DC output terminal (268); a first thyristor (261) connected between the first DC output terminal (267) and the first AC input terminal (255); a second thyristor (263) connected between the first DC output terminal (267) and the second AC input terminal (257); a gate control circuit (272) adapted and connected to control a first conductance state of the first thyristor (261) and to control a second conductance state of the second thyristor (263) such that the first thyristor and the second thyristor provide a rectified AC voltage between the first DC output terminal (267) and the second DC output terminal (268) as the output voltage, wherein the gate control circuit has a current signal input terminal for receiving a current signal indicative of a current flowing from the first AC input terminal (255) through the first thyristor (261) to the first DC output terminal (267), wherein the control circuit is arranged and connected to control, based on the current signal, the first conductance state of the first thyristor.
Abstract:
Die Erfindung betrifft ein Verfahren zum Überwachen einer Abstimmung eines in einem Zwischenkreis eines Stromrichtersystems (4) angeordneten Saugkreises (16), wobei der Zwischenkreis (12) zwischen einen Eingangs-Stromrichter (8) und einen Ausgangs- Stromrichter (10) des Stromrichtersystems (4) zwischengeschaltet ist. Um ein verbessertes Verfahren zum Überprüfen einer Abstimmung eines in einem Zwischenkreis angeordneten Saugkreises zu erreichen, welches im laufenden Betrieb des Stromrichtersystems angewandt werden kann, wird vorgeschlagen, dass ein in den Zwischenkreis eingespeister Zwischenkreisstrom (Iz) zeitabhängig ermittelt wird. Weiter wird nach dem vorgeschlagenen Verfahren anhand des Zwischenkreisstroms zumindest derjenige doppelt-netzfrequente Zwischenkreisstrom (lz,2fAC1), welcher bei einem vorgegebenen Betriebszustand des Stromrichtersystems (4) fließt, ermittelt. Ferner wird derdoppelt-netzfrequente Zwischenkreisstrom und/oder eine aus diesem abgeleitete Größe mit einer Referenz verglichen und die Saugkreisabstimmung unter Verwendung des Vergleichs überwacht.
Abstract:
An electric assembly is described herein. The electric assembly can include a housing having at least one wall that forms a cavity, where the housing is rated for subsea conditions. The electric assembly can also include at least one motor disposed within the cavity. The electric assembly can further include at least one controller disposed with the cavity and coupled to the at least one motor, where the at least one controller controls the at least one motor.
Abstract:
A switch signal is produced in order to form a switching time t2 in order to adapt the switch frequency in a converter, such that the waited zero crossing of the load circuit (13) for the point in time t3 is determined and the switching time is derived therefrom. The switching point in time t2 and the waited zero crossing of the load circuit (13) advances about the load circuit. The converter is controlled in such a manner that switching loss is minimised.
Abstract:
A system and method for controlling an adjustable speed drive (ASD) to decelerate an AC load during a generating mode of operation is disclosed. The ASD includes a capacitor and an inverter coupled to a DC link. A current sensor system is coupled to an output of the inverter. The ASD further includes a control system programmed to calculate an energy of the capacitor, generate a reference power using the calculated capacitor energy, and calculate a feedback power from realtime current signals received from the current sensor system. The control system compares the feedback power to the reference power, defines a frequency offset based on the comparison, generates a speed command using the frequency offset, and outputs the speed command to the inverter to maintain a smooth DC link voltage during deceleration.