Abstract: A power failure protection system is provided for a solid state drive. In an embodiment, the system includes: power converters; a stand-by power converter; a power switch array including power switch pairs; and a power control complex programmable logic device. The power control complex programmable logic device monitors power failures of the power converters; when a power failure of a particular power converter is detected, configures a power level for the stand-by power converter, the configured power level corresponding to the failed power converter; and controls a target power switch pair corresponding to the failed power converter such that an operation voltage generated by the stand-by power converter is applied to an internal component.

Abstract: This power system operation assisting device is provided with: a multiple signal frequency specifying unit that uses, as inputs, measured data of an object to be measured and a frequency specifying parameter for calculating a frequency component of the measured data to calculate an oscillation frequency; a generation source candidate calculation unit that uses, as an input, the calculated oscillation frequency to calculate a generation source candidate of an unstable oscillation occurring in a power system; a generation source guarantee test unit that calculates the guarantee test result of the generation source candidate; and a display unit that displays the oscillation frequency, the generation source candidate, and the guarantee test result.

Abstract: Modular power systems, smart battery modules, and monitoring and control systems are described herein. The modular power system comprises at least one mains converter connected between a mains supply and a DC bus, a monitoring and control system connected to the DC bus, and a plurality of smart battery modules configured to be removably connected in parallel to the DC bus. Each battery module comprises a decoupling unit configured to electrically disconnect, or connect the battery module to, or from, the DC bus. The monitoring and control system is configured to monitor supply of mains power to the mains converter, the voltage of the DC bus, the terminal voltage of each smart battery module, and the magnitude of the load is that is present on the DC bus. The monitoring and control system is configured to control the DC output voltage of the mains converter; and control the decoupling unit of each smart battery module to be in one of at least: a connected mode, and a disconnected mode.

Abstract: An artificial intelligence reactive power control system for low voltage ride-through in a grid connected distributed generation network includes a grid, a circuit breaker, a distributed generation circuit including 3-phase terminals, and a voltage and current measurement unit connected to the 3-phase terminals and configured to generate a set of measured variables. An intelligent low voltage ride-through detector receives the set of measured variables and identifies a low voltage ride-through status of the utility grid. An intelligent reactive power controller receives a low voltage ride-through status signal from the intelligent low voltage ride-through detector and controls a low voltage ride-through during a grid voltage sag and a voltage reduction by transmitting one or more of an active power reference and a reactive power reference value to the distributed generation circuit based on the low voltage ride-through status signal.

Abstract: A primary-sided arrangement of primary winding structures of a system, wherein the primary-sided arrangement includes at least three phase lines and at least one winding structure per phase line, wherein each winding structure includes at least one subwinding structure, wherein the winding structures extend along a longitudinal axis of the primary-sided arrangement, wherein a pitch between corresponding subwinding structures of a first winding structure and a second winding structure is chosen from an interval of a length of one subwinding structure, and wherein a pitch between corresponding subwinding structures of the first winding structure and the third winding structure is smaller than the pitch between corresponding first and second subwinding structures.

Abstract: The subject matter of the invention is a resonant DC-DC voltage converter, notably for an electric or hybrid vehicle, said converter including n interleaved main resonant circuits, n being a natural integer greater than or equal to two, and in which: the main resonant circuits are connected together at least one neutral point different from a ground of the converter, said neutral point being connected to a ground of the converter by an impedance configured to store energy and to enable zero voltage switching of the switches of the resonant DC-DC converter.

Abstract: During initiation under an isolated island condition, the amplitude of a voltage reference wave output generated by a flexible DC transmission control and protection system is in a segmented mode, wherein a first segment of the reference wave amplitude begins at zero or a fixed value Ux and rapidly increases to Ua kV at a rate of a kV/s, avoiding a low output voltage reference wave and high error and harmonic content of a sampled voltage and current. A second segment increases to Ub kV at a rate of ? kV/s, a third segment increases to Uc kV at a rate of ? kV/s, and the Nth segment increases to a rated voltage of UN kV at a rate of ? kV/s, thereby achieving non-disturbance and shockless initiation of a flexible DC transmission system under an isolated island condition.

Abstract: A method of controlling output of an ESS depending on droop control according to frequency variation range of a power grid in the present invention may comprise steps of: monitoring the frequency variation range of the power grid; predicting frequency correction range resulting from regulation of an engine generator during a predetermined unit regulation time if the frequency variation range is determined to exceed a first reference value; controlling the output of the ESS with an output value determined by a frequency of the power grid according to a droop control algorithm set as a default if the predicted frequency correction range does not exceed a second reference value; and fixing the output of the ESS during the unit regulation time if the predicted frequency correction range exceeds the second reference value.

Abstract: Methods and systems are provided for a starter motor system for cranking an engine. In one example, a starter motor system includes, a battery, two electric motors arranged in series, two main contactors, two auxiliary contactors, and two solenoid contactors. Each of the two electric starter motors may be simultaneously energized to crank the engine in tandem after the pinion gears of both the electric motors are coupled to the ring gear of the engine.

Abstract: Disclosed are a distribution transformer terminal and a method for monitoring a state of a distribution transformer court device. The distribution transformer terminal includes an ARM core processor, a carrier communication module connected to a court device, a sub-G wireless communication module connected to the court device and a GPS module connected to the court device. The ARM core processor is connected to the carrier communication module, the sub-G wireless communication module and the GPS module. The ARM core processor is configured to identify a phase of the court device and a court to which the court device belongs, acquire an operating state and fault information of the court device through the sub-G wireless communication module, and acquire geographical location information of the court device through the GPS module.

Abstract: A method and apparatus for setting an impedance of a power conditioning unit (PCU). In one embodiment, the method comprises applying a disturbance to a virtual AC voltage produced by a power conditioning unit (PCU) that is coupled to a power grid, where the disturbance has a first phase; measuring a second phase of the applied disturbance on the power grid; comparing the second phase of the applied disturbance to the first phase of the disturbance; and adjusting, when the second phase differs from the first phase by more than a threshold amount, an impedance of the PCU.

Abstract: A filter component such as an EMC filter and a method for using an filter component are disclosed. In an embodiment, a filter component includes a resonant circuit having an inductance and at least one capacitor that is connected in series with the inductance, wherein the resonant circuit is designed and arranged for attenuating harmonics in a longwave band.

Abstract: A method for generating charge for a service disconnect operation for an electric meter includes: charging a service disconnect capacitor for an electric meter to a voltage higher than a voltage provided by a power supply of the electric meter; monitoring the voltage on the service disconnect capacitor; receiving, by the electric meter, a service disconnect switch instruction signal; determining, based on the monitoring, whether the voltage on the service disconnect capacitor exceeds a specified voltage threshold value; and in response to receiving the service disconnect switch instruction signal and determining that the voltage on the service disconnect capacitor exceeds the specified voltage threshold value, discharging the service disconnect capacitor through windings of a service disconnect actuator. The service disconnect actuator may be configured to cause contacts of a service disconnect switch to change position to make or break a circuit connection between a line voltage and a load.

Abstract: A wireless power system has a wireless power transmitting device and a wireless power receiving device. The wireless power transmitting device may be a wireless charging mat with one or more coils or may be a wireless charging puck with one or more coils. In some embodiments, the wireless charging puck may have six coils or other number of coils arranged in a ring. The wireless power receiving device may have an elongated magnetic core such as a C-shaped core with pillars at opposing ends. First and second coils may be formed on the pillars and a third coil may be formed between the first and second coils. The coils of the wireless power receiving device such as the first and second coils on the magnetic core may be configured to receive magnetic flux emitted by a pair of the six coils in the wireless charging puck.

Abstract: Embodiments of the present application provide a wireless energy transmission method and device. A method includes: generating a visible light communication signal according to wireless energy transmission intensity between a wireless energy sending device and a wireless energy receiving device; and sending the visible light communication signal. A signal can be transmitted (or received) related to wireless energy transmission intensity through visible light communication, to enable a user to easily obtain information about wireless energy transmission intensity.

Abstract: The present disclosure relates to a recloser control that detects islanding based on a continuous analysis of frequency and rate of change of frequency. For example, a recloser control may include protection circuitry that is communicatively coupled to a recloser. The recloser control may receive measurements of an electrical characteristic in an electric power delivery system. The recloser control may determine frequency (F) and a rate of change of frequency (ROCOF) based on the received measurements. The recloser control may detect islanding of a microgrid in the electric power delivery system based at least in part on F and ROCOF. The recloser control may send a signal to the recloser to trip the recloser based on the islanding of the microgrid.

Abstract: The present disclosure relates to a capacitor bank control system that uses a combination of line post sensors and wireless current sensors for control operations. For example, a capacitor bank controller may include one or more inputs that electrically couple to a line post sensor to allow the capacitor bank controller to obtain line post sensor measurements. The capacitor bank controller may include a transceiver that receives wireless current sensor measurements from first and second wireless current sensors. The capacitor bank controller may include a processor that controls one or more switching devices of a capacitor bank based at least in part on a combination of line post sensor measurements and wireless current sensor measurements.

Abstract: A current balance circuit including a current sensing front end for sensing an output signal from each of a plurality of switching regulators and a current sensor for receiving the sensed output signal and converting the sensed signal into a sensed current signal. The current balance circuit further includes a current averaging circuit for receiving the sensed output signals and determining an average current output for the plurality of switching regulators and a current difference circuit for receiving the average current value and the sensed current signals and determining a current difference for each of the plurality of switching regulators. A calibration circuit is included for receiving the current differences and calculating a calibration value corresponding to each of the plurality of switching regulators which provides an indication of how to adjust a current output of the plurality of switching regulators to balance the current across the plurality of switching regulators.

Abstract: An operating circuit and a method for operating a synchronous machine on a voltage supply network is disclosed. The operating circuit has a converter circuit with controllable converter switches and a controllable switching arrangement to switch the converter circuit between a start converter configuration and a direct converter configuration. The power supply network is connected to a converter output and the synchronous machine is connected to a converter input of the converter circuit. In the direct converter configuration, an AC voltage is provided at the converter output with a preset AC voltage frequency. In the direct converter configuration, the switching of the AC voltage between the converter input and the converter output takes place without intermediate rectification.

Abstract: The invention relates to a method and system for electronic current control for a flexible DC battery pack, in which the battery pack has a plurality of flexibly interconnectable modules having a respective energy store and at least two respective controllable switches and the modules are electrically connected to one another to form a section having a first and a second section end and the two section ends are connected to a respective high-voltage connection, in which the at least two switches of a respective module interrupt a battery current I or interconnect the respective energy store at least in series or parallel with or to bypass the respective energy store of the respectively adjacent module, in which the flexible interconnection of the modules is controlled by a battery control unit and hence a prescribed DC voltage V is provided.