Systems and methods are provided for braking a translator of a linear multiphase electromagnetic machine. The system detects a fault event, and in response to detecting the fault event, causes the translator to brake using an electromagnetic technique. Braking includes causing the translator to stop reciprocating, by applying a force opposing an axial motion, which may occur within one cycle, or over many cycles. The fault event may include, for example, a fault associated with an encoder, a controller, an electrical component, a communications link, a phase, or a subsystem. The system includes a power electronics system configured to apply current to the phases. The system may use position information, current information, operating parameters, or a combination thereof to brake. Alternatively, the system need not use position information, current information, and operating parameters, and may brake the translator independent of such information.

A hybrid electric aircraft propulsion system and method of operation are described. The system comprises a thermal engine, a generator coupled to the thermal engine, a first electric propulsor operatively connected to the generator to receive alternating current (AC) electric power therefrom, a second electric propulsor, a generator inverter operatively connected to the generator to convert AC electric power to direct current (DC) electric power, and a first motor inverter operatively connected to the generator inverter and selectively connected to one of the first electric propulsor and the second electric propulsor and configured to receive the DC electric power and provide the first electric propulsor and the second electric propulsor with AC electric power, respectively.

A method of operating a wind turbine is provided. A controller is configured to activate or deactivate each of two or more distinct control features, each control feature changing the operating characteristic of the wind turbine and having an impact on at least one of lifetime and energy production . The method includes determining a type of optimization parameter and an optimization target for the optimization parameter, wherein the optimization parameter is related to at least one of lifetime or energy production of the wind turbine. The method further performs one or more optimization steps, wherein each optimization step is performed for a different combination of activation states of the two or more control features. Based on the one or more optimization steps, an optimal combination of activation states of the two or more control features for which the estimated optimization parameter achieves the optimization target is determined.

A wind turbine having an electrical power generation assembly and a control device for controlling the power generation assembly is provided, the electrical power generation assembly including a generator, at least one converter connected to the generator, and an overheating detection device, wherein the overheating detection device includes—at least two temperature sensing elements at different positions of the power generation assembly, wherein the temperature sensing elements are connected in series along a signal line to provide a common sensor signal and are each adapted to indicate the exceeding of a respective critical temperature at their position in the common sensor signal, and—a detection unit for evaluating the common sensor signal, which is connected to the signal line.

A power system for an electrical system with highly fluctuating loads is powered by one or more power sources that are slow to react to load changes. The power sources are connected to electrical equipment used on the drill rig which provide active load to the generate. One or more load banks may be positioned to provide passive load to the generators to maintain generally constant generator load, while allowing for instant access to power as active load increases. Generators may be run at 100% capacity, a maximum efficient capacity, or at a high enough level to allow for a sufficiently rapid increase in power output. At least one parameter of a drilling operation may be utilized to anticipate load demand changes.

A power system for an electrical system with highly fluctuating loads is powered by one or more power sources that are slow to react to load changes. The power sources are connected to electrical equipment used on the drill rig which provide active load to the generate. One or more load banks may be positioned to provide passive load to the generators to maintain generally constant generator load, while allowing for instant access to power as active load increases. Generators may be run at 100% capacity, a maximum efficient capacity, or at a high enough level to allow for a sufficiently rapid increase in power output. At least one parameter of a drilling operation may be utilized to anticipate load demand changes.

The application relates to a method and device for locating equipment-level oscillation sources of DFIG grid-connected system, which belongs to the technical field of wind generation, and solves the problem of stable operation of the wind power grid-connected system at the current stage. The method comprises: constructing the energy correlation topology network of the components in DFIG; analyzing the dynamic energy flows between the components during the oscillation process; calculating magnitudes of the causality between the dynamic energy flows; building a causality diagram of oscillation transmission in the DFIG; analyzing the distribution of the magnitude of the causality in the diagram, determining the oscillation transmission routes and locating the oscillation sources.

When a state where a power-generation voltage of a vehicle AC power generator is the same as or lower than a predetermined voltage has continued for a predetermined time or longer, a power generation controller stops or disables a low-voltage protection circuit from performing its operation so that an unintentional voltage rise caused by the low-voltage protection circuit is prevented.

A system includes a power distribution bus configured to distribute power from an electrical power source. The system also includes a plurality of electrical loads configured to receive portions of the power from the electrical power source. The system further includes a doubly-fed induction machine (DFIM) configured to reduce transmission impedance on the power distribution bus in response to a change in real or reactive power at one or more of the electrical loads, and reduce low frequency power oscillations at the source.

This disclosure is directed to a method for operating a wind turbine which includes a speed-variable drive system. The system includes an electrical machine and a pulsewidth modulation-controlled converter. The speed-variable drive system is connected to an electrical grid. In the event of a transient grid fault, a frequency of the pulsewidth modulation is determined in response to a current in an electrical circuit connected to the converter.