Abstract: A hybrid circuit breaker for interrupting a fault current in an electrical circuit line having a line impedance, the hybrid circuit breaker including a mechanical circuit breaker adapted to interrupt the line upon detecting the fault current, a semiconductor device arranged in parallel with the mechanical circuit breaker to conduct the fault current when the mechanical circuit breaker is disconnected, a branch connected between the electrical circuit line and ground, the branch including an impedance unit and a control unit configured, upon detecting the fault current, to connect the impedance unit in parallel with the line impedance.

Abstract: The invention concerns a method, voltage source converter and computer program product for supporting an associate AC system and comprising: a number of cells (CA1, CA2, CA3, CA4, CA5, CA6, CB1, CB2, CB3, CB4, CB5, CB6, CC1, CC2, CC3, CC4, CC5, CC6), each cell comprising a string of switching elements in parallel with a cell capacitor, at least some cells further including a battery module group comprising at least one battery module connectable in parallel with the cell capacitor and a control unit (20) configured to selectively connect the battery module groups of a number of cells in parallel with corresponding cell capacitors for exchanging power with the associated AC system.

Abstract: The invention relates to power networks, and in particular to a battery energy source arrangement and voltage source converter system in such network. The battery energy source arrangement includes battery energy storage, having one or more parallel-connected battery strings and a mechanism for connecting a voltage of the battery strings to a load. The battery energy source arrangement further includes battery string voltage adapter devices connected in series with respective ones of the one or more battery strings wherein the battery string voltage adapter devices are designed to handle only a fraction of the voltage handled by the battery strings.

Abstract: A power module (10), which is operated serially with other similar power modules in a converter valve, comprises a plurality of submodules (13a-d) connected in parallel, wherein each of the submodules includes one or several semiconductor elements connected in parallel and the power kind module is of the kind wherein if one of the submodules starts malfunctioning, the remaining ones of the submodules assume a closed circuit. The power module further comprises, for each of the submodules, a separate driver unit (14a-d) for driving the one or several semiconductor elements of that submodule, and a separate control unit (11a-d) for controlling the driver unit of that submodule. The power module may be used in HVDC or SVC apparatuses.

Abstract: A photovoltaic system for generating an output voltage that is uninfluenced by varying irradiation, includes a photovoltaic source having an input terminal and an output terminal. The photovoltaic system includes a voltage adding arrangement having a first input terminal and an output terminal. The voltage adding arrangement is connected in series with the photovoltaic source, and includes a first route having a voltage source and a second route as a voltage source bypass. The first and second routes extend between the first input terminal and the output terminal of the voltage adding arrangement. The first and second routes being alternately activateable.

Abstract: The invention concerns a method, voltage source converter and computer program product for supporting an associate AC system and comprising: a number of cells (CA1, CA2, CA3, CA4, CA5, CA6, CB1, CB2, CB3, CB4, CBS, CB6, CC1, CC2, CC3, CC4, CCS, CC6), each cell comprising a string of switching elements in parallel with a cell capacitor, at least some cells further including a battery module group comprising at least one battery module connectable in parallel with the cell capacitor and a control unit (20) configured to selectively connect the battery module groups of a number of cells in parallel with corresponding cell capacitors for exchanging power with the associated AC system.

Abstract: Storage device for a high voltage electrical power including at least two modules connected in series, each module including at least one dc power-source in a container with positive and negative terminals. The device including positive and negative poles, first and second conductors arranged to form a current path between the poles, the first conductor including a plurality of conductor parts connected to the terminals of the modules to provide a series connection, a first module of the series being connected to one of the poles, and the second conductor is connected between a last module in the series and the other pole, wherein the conductors are arranged to pass through the containers in parallel such that a current flows through the first conductor in a first direction and through the second conductor in an opposite second direction.

Abstract: A system for supplying electric power from an AC power source to ships, each of the ships moored at a respective berth of a quay, the system including a rectifier, having an AC and DC side, for converting AC electric power from the AC power source to DC power, the AC side arranged to be connected to the AC power source, and a plurality of ship connection arrangements for supplying electric power to a respective ship, each of the ship connection arrangements placed at one of the berths and including an inverter configurable to output AC power at a first or a second frequency and a ship connector for connecting the ship. A DC distribution network connected to the DC side of the rectifier and the rectifier is placed at a distance from the quay and each of the inverters is connected to the DC distribution network is also contemplated.

Abstract: A dc power source for a high voltage power apparatus, the dc power source including one or more strings including a plurality of dc power source units connected in series, and switches configured to connect and disconnect said strings. The switches are solid-state switches distributed among the power source units of each string, and all solid-state switches in the string are arranged so that they are turned on and off simultaneously. Each switch is connected in parallel with a first controllable semiconductor in a first direction and connected in parallel with a second controllable semiconductor in a second direction which is opposite to the first direction, and the dc power source includes a control unit configured to bypass a failed switch by triggering the forward biased of the first or second controllable semiconductor connected to the failed switch in case a fault in the switch is detected.

Abstract: A hybrid circuit breaker, including a first circuit that includes: a main current path which includes a mechanical switch element, a commutation path arranged in parallel with the main current path and including a controllable semi-conductor switch element. The breaker also includes a first capacitor provided in the commutation path in series with the controllable semi-conductor switch element, and a second circuit, arranged in series with the first circuit and including a second capacitor and an inductance-generating element arranged in series with each other.

Abstract: A hybrid circuit breaker for interrupting a fault current in an electrical circuit line having a line impedance, the hybrid circuit breaker including a mechanical circuit breaker adapted to interrupt the line upon detecting the fault current, a semiconductor device arranged in parallel with the mechanical circuit breaker to conduct the fault current when the mechanical circuit breaker is disconnected, a branch connected between the electrical circuit line and ground, the branch including an impedance unit and a control unit configured, upon detecting the fault current, to connect the impedance unit in parallel with the line impedance.

Abstract: An electric plant with a capacity to charge electric batteries is a plant for transmitting electric power including a Voltage Source Converter, an alternating voltage network connecting an alternating voltage side of the converter and a direct voltage part connected to the direct voltage side of the converter. The converter has a series connection of switching cells having each at least one energy storing capacitor. Electric batteries may be connected in parallel with the capacitor, and the charging state thereof may be influenced by controlling the switching cells of the Voltage Source Converter through a control arrangement.

Abstract: A system for supplying electric power from a main power grid to a plurality of ships moored at a respective berth of a quay. The system includes a connection point for connecting to the grid supplying electrical power at a first frequency, a frequency converter arrangement for converting electric power from the grid at the first frequency to electric power at a second frequency, a first connector, arranged to provide power from the grid at the first frequency, a second connector, arranged to provide power at the second frequency from the frequency converter arrangement, a plurality of switches, each switch being configured to supply of power from either of the two connector to a respective berth, the system further includes a plurality of ship connection arrangements connected to a respective switch, each ship connection arrangement being adapted for connection to an electric system of a ship. A corresponding arrangement and method are also presented.

Abstract: A power apparatus for a high voltage electrical power system, that includes a voltage source converter and a high voltage dc power source including one or more strings having a plurality of dc power source members connected in series, and switches configured to connect and disconnect the strings, where the switches are solid-state switches, each string is subdivided into a plurality of dc power source units each dc power source unit including a plurality of dc power source members connected in series and each dc power source unit is provided with one of the solid-state switches configured to connect and disconnect the dc power source unit, and that all solid-state switches in the string are arranged so that they are turned on and off simultaneously.

Abstract: A dc power source for a high voltage power apparatus, the dc power source including one or more strings including a plurality of dc power source units connected in series, and switches configured to connect and disconnect said strings. The switches are solid-state switches distributed among the power source units of each string, and all solid-state switches in the string are arranged so that they are turned on and off simultaneously. Each switch is connected in parallel with a first controllable semiconductor in a first direction and connected in parallel with a second controllable semiconductor in a second direction which is opposite to the first direction, and the dc power source includes a control unit configured to bypass a failed switch by triggering the forward biased of the first or second controllable semiconductor connected to the failed switch in case a fault in the switch is detected.

Abstract: A hybrid circuit breaker, including a first circuit that includes: a main current path which includes a mechanical switch element, a commutation path arranged in parallel with the main current path and including a controllable semi-conductor switch element. The breaker also includes a first capacitor provided in the commutation path in series with the controllable semi-conductor switch element, and a second circuit, arranged in series with the first circuit and including a second capacitor and an inductance-generating element arranged in series with each other.

Abstract: A photovoltaic system for generating an output voltage that is uninfluenced by varying irradiation, includes a photovoltaic source having an input terminal and an output terminal. The photovoltaic system includes a voltage adding arrangement having a first input terminal and an output terminal. The voltage adding arrangement is connected in series with the photovoltaic source, and includes a first route having a voltage source and a second route as a voltage source bypass. The first and second routes extend between the first input terminal and the output terminal of the voltage adding arrangement. The first and second routes being alternately activateable.

Abstract: A system for supplying electric power from an AC power source to ships, each of the ships moored at a respective berth of a quay, the system including a rectifier, having an AC and DC side, for converting AC electric power from the AC power source to DC power, the AC side arranged to be connected to the AC power source, and a plurality of ship connection arrangements for supplying electric power to a respective ship, each of the ship connection arrangements placed at one of the berths and including an inverter configurable to output AC power at a first or a second frequency and a ship connector for connecting the ship. A DC distribution network connected to the DC side of the rectifier and the rectifier is placed at a distance from the quay and each of the inverters is connected to the DC distribution network is also contemplated.

Abstract: Storage device for a high voltage electrical power including at least two modules connected in series, each module including at least one dc power-source in a container with positive and negative terminals. The device including positive and negative poles, first and second conductors arranged to form a current path between the poles, the first conductor including a plurality of conductor parts connected to the terminals of the modules to provide a series connection, a first module of the series being connected to one of the poles, and the second conductor is connected between a last module in the series and the other pole, wherein the conductors are arranged to pass through the containers in parallel such that a current flows through the first conductor in a first direction and through the second conductor in an opposite second direction.

Abstract: A power apparatus for a high voltage electrical power system, that includes a voltage source converter and a high voltage dc power source including one or more strings having a plurality of dc power source members connected in series, and switches configured to connect and disconnect the strings, where the switches are solid-state switches, each string is subdivided into a plurality of dc power source units each dc power source unit including a plurality of dc power source members connected in series and each dc power source unit is provided with one of the solid-state switches configured to connect and disconnect the dc power source unit, and that all solid-state switches in the string are arranged so that they are turned on and off simultaneously.