Abstract: Methods, apparatus, systems, and computer-readable media are set forth for providing a graphing database for exploration and/or production data, e.g., as used in the oil & gas industry. The graphing database can include multiple different entities that are defined by nodes, node edges, and properties that are generated from information collected by an exploration and/or production system. Entities can be designated as complete when the attribute data associated with those entities satisfy mapping rules for standardizing different types of entities. In this way, end users that access data from the graphing database can receive complete data that is consistently available through a variety of sources.

Abstract: Fault protection of a voltage source converter is provided. An apparatus has a chain-link circuit in series with a director switch. The chain-link circuit includes cells including an energy storage element and cell switching elements connected with anti-parallel diodes. Each cell switching element has a cell switching element controller. The director switch includes director switch units, each having a director switching element and a director switch unit controller. Each cell switching element controller monitors for a fault current and turns-off its associated cell switching element and reports a fault event to a fault controller. Each director switch unit controller monitors for a fault current and reports a fault event to the fault controller but the director switch unit control keeps its associated director switching element turned-on. The fault controller monitors for reports of fault events to order the cell switching elements of at least some of the cells to turn-off.

Abstract: A remote eye examination method includes initiating a remote chat session between a local computing device coupled to a phoropter, and a remote computer, and initializing the phoropter for remote control by the remote computer. Then, a multi-colored lamp is activated in a first color until a determination that a refractory examination utilizing the phoropter has commenced. Thereafter, responsive to a determination that the examination has commenced, the multi-colored lamp changes to a second color, and movement of portions of the phoropter are commanded as directed by the remote computer, data is recorded into a patient record and a progression of the examination monitored. Finally, on condition that a threshold period of time before a conclusion of the refractory examination is detected, the multi-colored lamp changes to a third color and upon conclusion of the examination, a message transmitted to a remote account indicating access to the patient record.

Abstract: One embodiment of the present invention sets forth a technique for translating textual content. The technique includes receiving a request to translate an element of source text from an origin language to a target language and searching a database for an element of matching text in the origin language that at least partially matches the element of source text. The technique further includes, if an element of matching text is found in the database, then reading from the database an element of previously translated text that is mapped to the element of matching text and includes at least one word that is translated into the target language, and transmitting the element of source text, the element of matching text, and the element of previously translated text to a location for translation, or if an element of matching text is not found in the database, then transmitting the element of source text to the location for translation.

Abstract: A far-end power converter within a DC transmission network that includes a near-end power converter and at least one far-end power converter interconnected by portions of transmission medium. A method includes: establishing a linear time-invariant model of the transmission medium; determining a response characteristic of the time-invariant model; measuring an output operating property of the transmission medium at the near-end power converter; identifying one far-end power converter as being of interest; deriving a corresponding input operating property of the transmission medium at the far-end power converter of interest by applying an inverse of the response characteristic of the time-invariant model to the measured output operating property of the transmission medium at the near-end power converter; and comparing the derived input operating property with a fault characteristic to determine whether there is a fault on the far-end power converter of interest.

Abstract: A technique for translating text strings includes receiving a source language text string from an application, determining that a translated text string that includes a translation in a target language of the source language text string is not available for use by the application, transmitting the source language text string to a translation service for translation, receiving the translated text string from the translation service, and causing the translated text string to be available for use by the application.

Abstract: Fault protection of a voltage source converter is provided. An apparatus has a chain-link circuit in series with a director switch. The chain-link circuit includes cells including an energy storage element and cell switching elements connected with anti-parallel diodes. Each cell switching element has a cell switching element controller. The director switch includes director switch units, each having a director switching element and a director switch unit controller. Each cell switching element controller monitors for a fault current and turns-off its associated cell switching element and reports a fault event to a fault controller. Each director switch unit controller monitors for a fault current and reports a fault event to the fault controller but the director switch unit control keeps its associated director switching element turned-on. The fault controller monitors for reports of fault events to order the cell switching elements of at least some of the cells to turn-off.

Abstract: A voltage source converter includes DC terminals for connection to a DC network, a plurality of converter limbs between the DC terminals, and a controller. Each converter limb includes first and second limb portions separated by a respective AC terminal, the AC terminal of each converter limb connecting to a multi-phase AC network. Each limb portion extends between a corresponding DC terminal and AC terminal. Each limb portion including a valve having switching element(s) and energy storage device(s), the switching element being switchable to selectively insert the energy storage device into the limb portion and bypass the energy storage device to control a voltage across that valve. The controller is programmed to control the switching of valves to form a current circulation path including the limb portions corresponding to the selected valves, the AC phases connected to the limb portions corresponding to the selected valves, and the DC network.

Abstract: A technique for translating text strings includes receiving a source language text string from an application, determining that a translated text string that includes a translation in a target language of the source language text string is not available for use by the application, transmitting the source language text string to a translation service for translation, receiving the translated text string from the translation service, and causing the translated text string to be available for use by the application.

Abstract: A voltage source converter including a plurality of terminals, a plurality of switching elements, a plurality of energy storage devices connected between the plurality of terminals, and a controller. Each energy storage device stores and releases energy to provide a voltage, and the plurality of switching elements are arranged to be switchable to control flow of current through each energy storage device. The controller is programmed to operate in an energy regulation mode to regulate energy.

Abstract: In the field of high voltage direct current power transmission networks, a method of controlling a converter that includes at least one converter limb which corresponds to a respective phase of the converter, is described. The method includes obtaining a respective AC current demand phase waveform for each converter limb which the corresponding converter limb is required to track, and a DC current demand which each converter limb is also required to track. The method further determining a limb portion current for each limb portion that the limb portion must contribute to track the corresponding required AC current demand phase waveform and the required DC current demand, and providing a limb portion voltage source for each limb portion to achieve the corresponding limb portion current. The method carrying out mathematical optimization to determine one or more optimal limb portion currents and/or provide optimal limb portion voltage sources.

Abstract: A method of controlling a voltage source converter including a converter limb corresponding to a respective phase of the converter, each converter limb extending between first and second DC terminals and including first and second limb portions separated by an AC terminal and each limb portion including a chain-link converter which is operable to provide a stepped variable voltage source, includes the steps of obtaining a AC current demand phase waveform and a DC current demand for each corresponding converter limb is configured to track, and carrying out mathematical optimization to determine an optimal limb portion current for each limb portion must contribute to track the corresponding required AC current demand phase waveform and the required DC current demand while minimising current conduction losses within each limb portion and additionally managing the energy stored by each chain-link converter.

Abstract: A voltage source converter comprises a converter limb including first and second DC terminals for connection to a DC network. Each converter limb includes first and second limb portions which are separated by an AC terminal for connection to an AC network. Each limb portion includes a switching element connected with a chain-link converter that is operable to provide variable voltage. The voltage source converter includes a control unit to switch the switching element in each of the first and second limb portions between conducting and non-conducting configurations to selectively switch the corresponding chain-link converter, each switching element while in its non-conducting configuration transitions between a non-voltage supporting state and a voltage supporting state; and operate each chain-link converter while switched out of circuit to generate a varying voltage waveform to reduce the voltage range the corresponding switching element is exposed to in its voltage supporting state.

Abstract: A technique for translating text strings includes receiving a source language text string from an application, determining that a translated text string that includes a translation in a target language of the source language text string is not available for use by the application, transmitting the source language text string to a translation service for translation, receiving the translated text string from the translation service, and causing the translated text string to be available for use by the application.

Abstract: One embodiment of the present invention sets forth a technique for translating textual content. The technique includes receiving a request to translate an element of source text from an origin language to a target language and searching a database for an element of matching text in the origin language that at least partially matches the element of source text. The technique further includes, if an element of matching text is found in the database, then reading from the database an element of previously translated text that is mapped to the element of matching text and includes at least one word that is translated into the target language, and transmitting the element of source text, the element of matching text, and the element of previously translated text to a location for translation, or if an element of matching text is not found in the database, then transmitting the element of source text to the location for translation.

Abstract: A method of identifying a faulty sub-module of a chain-link converter is provided, wherein the chain-link converter includes a plurality of sub-modules with each sub-module including at least one switching element and an energy storage device which together are selectively operable to provide a voltage source. The method comprises the steps of: measuring a switching characteristic of each sub-module of the chain-link converter; establishing a switching characteristic signature of the chain-link converter; and identifying the or each sub-module with a switching characteristic that deviates from the switching characteristic signature as being a faulty sub-module.

Abstract: A voltage source converter for interconnecting first and second electrical networks, including first and second terminals for connection to the first electrical network, and a primary converter limb extending between the first and second terminals including first and second primary limb portions separated by a third terminal connectable to the second electrical network. The converter further including a second chain-link converter connected to the third terminal and a control unit configured to selectively operate one or more chain-link modules to generate a discontinuous pulse width modulation voltage waveform. The converter further including a controller configured to selectively operate each chain-link converter to control the configuration of a discontinuous pulse width modulation voltage waveform at the third terminal.

Abstract: An offline semantic processor of a resource-constrained voice-enabled device such as a mobile device utilizes an offline grammar model with reduced resource requirements to parse voice-based queries. In various implementations, a query issued at a resource-constrained device may be semantically processed to identify candidate responsive actions that are performable by the resource-constrained device. Candidate responsive action performance statistics may be analyzed to select, from the one or more candidate responsive actions, a qualifying responsive action. In various implementations, the candidate responsive action performance statistics may relate to performance of the one or more candidate responsive actions by the resource-constrained device following issuance of the query.

Abstract: A synthetic test circuit, comprising: a device under test including a chain-link converter under test, comprising a plurality of test modules, each test module including module switches connected with an energy storage device; a terminal connected to the device under test; at least one injection circuit operably connected to the terminal, the injection circuit including a source, the source including a source chain-link converter, which includes a plurality of source modules, each source module including a plurality of module switches connected with at least one energy storage device; a controller being configured to operate each source module to selectively bypass the corresponding energy storage device and insert the corresponding energy storage device into the corresponding source chain-link converter so as to generate a voltage across the source chain-link converter and thereby operate the injection circuit to inject a current waveform and/or a voltage waveform into the chain-link converter under test.

Abstract: A synthetic test circuit, for performing an electrical test on a device under test, is provided. The circuit includes a terminal connectable to the device under test; a voltage injection circuit-operably connected to the terminal, the voltage injection circuit including a voltage source, the voltage source including a chain-link converter, the chain-link converter including a plurality of modules, each module including a plurality of module switches connected with at least one energy storage device; and a controller-configured to operate each module of the voltage injection circuit to selectively bypass the or each corresponding energy storage device and insert the or each corresponding energy storage device into the chain-link converter so as to generate a voltage across the chain-link converter and thereby operate the voltage injection circuit to inject a unidirectional voltage waveform into the device under test.