Patent application number | Description | Published |
20120069610 | CONVERTER - A multilevel voltage source converter for high voltage DC power transmission and reactive power compensation. The voltage source converter includes at least one phase element including a plurality of semiconductor switches to interconnect a DC voltage and an AC voltage. The voltage source converter also includes at least one auxiliary converter to act as a waveform synthesizer to modify the DC voltage presented to the DC side of the phase element. | 03-22-2012 |
20120182771 | CONVERTER WITH ACTIVE FAULT CURRENT LIMITATION - A voltage source converter for high voltage DC power transmission is disclosed. According to one aspect, the voltage source converter is connectable between a DC network and another electrical network to interconnect the DC network and the other electrical network. The voltage source converter includes a converter unit configured to convert power flowing between the DC network and the other electrical network and at least one fault unit. One or more of the fault units includes at least one fault module having a voltage source that is operable, in the event of a short circuit in a DC network connected to the voltage source converter, to produce a voltage that acts to reduce current flowing through the voltage source converter and the short circuit. | 07-19-2012 |
20130119970 | CONVERTER - A DC voltage source converter for use in high voltage DC power transmission comprising at least one chain-link converter connected between first and second DC terminals. The or each chain-link converter includes a chain of modules connected in series and each module including at least one pair of semiconductor switches connected in parallel with an energy storage device. The or each chain-link converter is operable when DC networks are connected to the first and second DC terminals to control switching of the modules to selectively charge or discharge the energy storage device of one or more of the modules, as required, to offset any difference in the DC voltage levels of the DC networks. | 05-16-2013 |
20130128629 | HYBRID 2-LEVEL AND MULTILEVEL HVDC CONVERTER - A voltage source converter is used in high voltage direct current power transmission and reactive power compensation. The voltage source converter comprises first and second DC terminals for connection in use to a DC network, three phase elements and at least one auxiliary converter connected between the first and second DC terminals, each phase element including a plurality of primary switching elements and at least one AC terminal for connection in use to a respective phase of a multi-phase AC network, the plurality of primary switching elements being controllable in use to facilitate power conversion between the AC and DC networks, the or each auxiliary converter being operable in use to act as a waveform synthesizer to modify a first DC voltage presented to the DC network so as to minimise ripple in the DC voltage. | 05-23-2013 |
20150116876 | METHOD OF FAULT CLEARANCE - There is a method of fault clearance for a DC power grid ( | 04-30-2015 |
20150180231 | CURRENT FLOW CONTROLLER - A current flow controller ( | 06-25-2015 |
20150349520 | ELECTRICAL APPARATUS - An electrical apparatus ( | 12-03-2015 |
20150372474 | CIRCUIT INTERRUPTION DEVICE - A circuit interruption device includes a main branch; a secondary branch having an electrical on-resistance which is higher than an electrical on-resistance of the main branch; and first and second terminals for connection to an electrical network, the main and secondary branches extending between the first and second terminals. The main branch includes a switching apparatus which is switchable to selectively allow current to flow in the main branch in a normal mode of operation or commutate current from the main branch to the secondary branch in a fault mode of operation. The secondary branch includes a switching device, the switching device including a normally-on switching element. The secondary branch further includes a control unit in communication with the normally-on switching element. The secondary branch further includes a power extraction circuit which is electrically coupled with the control unit. During the normal mode of operation the normally-on switching element is in an on-state to permit the secondary branch to conduct current, and during the fault mode of operation the control unit controls the switching of the or each normally-on switching element to an off-state to inhibit current flow in the secondary branch. | 12-24-2015 |