Abstract:
In the field of High Voltage Direct Current (HVDC) power transmission there is a need for an improved control module. A control module (40), for controlling a chain-link component (26, 28) of a converter (10), comprises two controllers (42, 44). Each controller (42, 44) is configured to selectively control a chain-link component (26, 28) in accordance with a control program that is stored in the said controller (42, 44). The control module (40) is configured to replace the control program stored in one of the controllers (42, 44) with a replacement control program while the other of the controllers (42, 44) is controlling the chain-link component (26, 28).
Abstract:
An inverter system (100), e.g. for use in a solar power supply, has been disclosed. The inverter system (100) comprises an input inverter (120) including a positive (121) and a negative (122) DC input terminals and first (123) and second (124) AC output terminals; and a bidirectional inverter device (130), including a first bidirectional subinverter (138) and a second bidirectional subinverter (139). The first (138) and second (139) bidirectional subinverters have DC terminals (132, 133) that are interconnected in parallel with a DC power storage device (131). The first bidirectional subinverter (138) have first (134) and second (135) AC terminals. The first AC terminal (134) is connected to the first AC output terminal (123) of the input inverter (120). The second bidirectional subinverter (139) have first (136) and second (137) AC terminals. The first AC terminal (136) is connected to the second AC output terminal (124) of the input inverter (120). The second AC terminal (135) of the first bidirectional subinverter (138) and the second AC terminal (137) of the second bidirectional subinverter (139) are interconnected.
Abstract:
The invention comprises a system for electrical power transmission and distribution to a plurality of subsea loads (4a-d). The system includes a long high voltage DC transmission cable (12) on the power side connected to two or more power supplies (20a-c) each comprising a DC/AC converter (2a-c) connected in series. The DC/AC converters (2a-c) are each connected to a transformer (3a-c) connected to supply one or more subsea power loads (4a-d). The power supplies are arranged with a bypass switch (1a-c) on the power side. The transformers (3a-c) may be of a split core type with a primary winding in a first HV enclosure (5) inductively connected to at least one secondary winding (3sa-c) of the transformers arranged in a second enclosure (6a-c). In other aspects of the invention a method and a computer program for carrying out the method are described.
Abstract:
A multilevel converter (10) converting between AC and DC comprises phase arms with cells between a DC pole and an AC terminal, where the cells comprise single voltage contribution cells and double voltage contribution cells (DVCA), where a double voltage contribution cell comprises a first section (SEC1) with a first group of series connected switching units in parallel with a first energy storage element (C1), a second section (SEC2) with a second group of series connected switching units in parallel with a second energy storage element (C2)and an interconnecting switch (IS) interconnecting the first and the second sections and connected between a positive end of the first energy storage element (C1) and a negative end of the second energy storage element (C2).
Abstract:
Apparatus and methods in accordance with this invention provide a multi-cell power supply for receiving power from a source and delivering power at an output terminal to a load. The multi-cell power supply includes a first power cell coupled to the source, and a first current sensor circuit. The first power cell provides a first output current, and includes a first output terminal coupled to a reference node of the multi-cell power supply, and a second output terminal coupled to the output terminal. The first current sensor circuit includes a first current sensor and a power supply. The first current sensor is coupled to the first output terminal of the first power cell, and measures the first output current. The power supply is coupled to either the reference node or a floating ground node of the first power cell, and provides power to the first current sensor.
Abstract:
A power distribution system includes a plurality of load side power converters configured in a modular stacked DC (MSDC) converter architecture (fig.l). Each load side converter (12) includes a respective energy storage device (14) such that together the plurality of energy storage devices provides a distributed subsea energy storage system configured to maintain a common subsea busbar voltage substantially constant during intermittent load voltage excursions.
Abstract:
Die Erfindung betrifft eine Schaltungsanordnung (1) zur Erzeugung einer Prüfspannung für die Prüfung eines Prüflings (2) umfassend zwei Hochspannungsquellen (3, 4) zur Erzeugung einer positiven und einer negativen Hochspannung variabler Amplitude an ihren jeweiligen Ausgängen (5, 6) und eine zwischen den Ausgängen (5, 6) der zwei Hochspannungsquellen (3, 4) und dem Prüfling (2) angeordnete Hochspannungsschalteranordnung (7), die zur sukzessiven Auf- und Entladung des Prüflings (2) geeignet schaltbar ist, wobei ferner eine Regelung (8) vorgesehen ist, die die aktuelle Prüfspannung am Prüfling (2) misst und abhängig von der gemessenen Prüfspannung zur definierten Auf- und Entladung des Prüflings (2) auf die Hochspannungsschalteranordnung (7) einwirkt. Im Rahmen der Erfindung ist vorgesehen, dass die Regelung (8) nicht auf die beiden Hochspannungsquellen (3, 4) einwirkt und dass eine separate Steuerung (14) für die beiden Hochspannungsquellen (3, 4) vorgesehen ist, wobei die Steuerung (14) ein von der Spannung am Prüfling (2) unabhängiges Taktsignal (T) erzeugt, so dass von den Hochspannungsquellen (3, 4) eine synchronisierte, vordefinierte und nicht durch die Regelung (8) beeinflusste Hochspannung (U1, U2) bereitgestellt wird.
Abstract:
The invention relates to a rectifier circuit (4), comprising at least two sub-modules (22) in a series connection that draws electrical power via in inductance (20) from a power source (8) emitting a direct voltage (16). Each sub-module (22) has one single-phase half bridge (34) on the input side and one single-phase full bridge (36) on the load side and the half bridge (34) and the full bridge (36) are connected on the direct voltage side and an intermediate circuit capacitor (38) is connected parallel thereto. According to the invention, an additional capacitor (40) connected parallel to the intermediate circuit capacitor (38) is provided in every sub-module (22).
Abstract:
It is provided a phase converter (301a-c, 301) for converting between AC and DC. The phase converter comprises: a positive phase DC connection (50i) and a negative phase DC connection (50ii); a first converter cell (400a) and a second converter cell (400b) serially connected between the positive phase DC connection (50i) and the negative phase DC connection (50ii); and a transformer (17a-c, 17) comprising two component windings (62a-b) on a first side and a main winding (63) on a second side. A phase AC connection (69a-b) of the phase converter is provided connected to the main winding (63); wherein each one of the first converter cell (400a) and the second converter cell (400b) comprises a four quadrant converter; an energy storage element (68) and an AC connection (65a-b); the AC connections (62a-b) of the first converter cell (400a) and the second converter cell (400b) are respectively connected to the component windings (62a-b) of the transformer; and the first converter cell (400a) and the second converter cell (400b) are individually controllable in terms of phase angle on their respective AC sides.