Abstract: A coordinated optimization method for VSC-HVDC Frequency Synchronization Control and primary frequency regulation of hydropower includes: obtaining optimal PI parameters of the VSC-HVDC Frequency Synchronization controller from a first layer output of a dual-layer optimization model for coordinated parameters of VSC-HVDC Frequency Synchronization and primary frequency regulation; and obtaining a target PID control parameters from a second layer output of the dual-layer optimization model. The coordinated optimization method further includes adjusting the optimal PI parameters of the synchronization controller based on the target selection range and updating the PID control parameters of the primary frequency regulation system of hydropower based on the target PID control parameters. This approach aims to address the challenge of balancing the frequency response speed between the VSC-HVDC synchronization system and the primary frequency regulation system of hydropower.

Abstract: The present specification provides a wireless power transmission device comprising: a power conversion unit configured so as to transmit, in a power transfer phase, wireless power generated on the basis of magnetic coupling to a wireless power receiving device; and a communication/control unit configured so as to perform an initial calibration for a power parameter prior to the power transfer phase, receive, from the wireless power receiving device, a first received power packet indicating the power received by the wireless power receiving device during the power transfer phase, and detect a foreign object by using the received power and a first power loss determined on the basis of the initial calibration.

Abstract: A safety module, which is applied to a processing machine including a processing member and a power source connected with the processing member, includes a visual element, a brake and a controller. The visual element defines safety and danger zones for the processing scope of the processing member. The brake is connected with the power source for providing a brake effect to the power source. The controller is connected with the power source, the visual element and the brake. When capturing that an object is located in the danger zone or determining that an object is about to enter the danger zone according to the movement trajectory of the object, the visual element transmits a brake signal to the controller to make the controller drive the brake to control the power source to stop operating. The safety module improves the safety of the operator operating the processing machine.

Abstract: This disclosure describes systems, methods, and apparatuses for preventing over-voltage conditions, the method comprising: monitoring, using a freewheeling circuit, a load voltage across a load, wherein the load is configured to receive power from a power supply; monitoring a freewheeling current in the freewheeling circuit; and controlling a state of the freewheeling circuit, based at least in part on one or more of comparing the load voltage to a voltage threshold, and comparing the freewheeling current to at least one current threshold.

Abstract: Controlling a load includes sensing a characteristic of a circuit. A device loads the circuit. It further includes, based at least in part on the sensed characteristic, determining whether the circuit is in a state in which load shedding should be performed. It further includes controlling a switch to control power from the circuit to the device.

Abstract: An in-vehicle network system includes control devices connected to a communication bus and configured to communicate with each other. The control devices includes startup control target control devices, each of which stores cluster configuration information. Each startup control target control device enters to a startup state or maintains the startup state. The control devices further include a management control device configured to change the cluster configuration information of the startup control target control devices. The startup control target control devices have cluster configuration information for normal operation and cluster configuration information for abnormal occurrence.

Abstract: An energy storage cabinet includes a battery rack and a power conversion system. A switch unit is connected between a battery unit and the power conversion system. A first end of the power conversion system is connected to a bus. When an energy storage cabinet in the energy storage system is started, a voltage at the first end of the power conversion system is greater than a first preset voltage. The power conversion system in the to-be-started energy storage cabinet may obtain, through the first end, a voltage output by the started energy storage cabinet, convert the voltage into a target voltage, and then supply power to the start unit. After obtaining the power, the start unit controls the switch unit to be turned on. The battery unit may output stored electric energy through the power conversion system, to start the energy storage cabinet.

Abstract: Systems may include an electrical load for a vehicle; a power provider for the electrical load, comprising a plurality of components including a battery pack, a vehicle electrical system, and a DC/DC converter electrically interposed between the electrical load and others of the plurality of components of the power provider. The systems may further include a power management controller, including a load power management circuit structured to: interpret a load power request; and provide at least one of a power modulation command or a voltage modulation command in response to the load power request, wherein the DC/DC converter is responsive to the at least one of the power modulation command or the voltage modulation command to provide at least one of a boost voltage or a buck voltage to a voltage provided by at least one of the battery pack or the vehicle electrical system.

Abstract: Methods and devices for wireless power transmission are described. An example wireless-power-transmitting device includes a programmable-splitter component configured to be switchable between a linear polarization setting and a circular polarization setting. The example device also includes a plurality of polarization-switching components coupled to a plurality of outputs of the programmable-splitter component, and a plurality of amplifiers coupled to respective outputs of the plurality of polarization-switching components. The example device further includes a plurality of antennas coupled to respective outputs of the plurality of amplifiers.

Abstract: A fault-responsive power system and method using asynchronous load current switching. A first supply-side current that flows from a power supply into a first conductor, which electrically couples the power supply to a load, is measured. Power is delivered to the load by modulating a first remote-side current on and off, with the remote-side current entering the load from the first conductor. Once it is determined that the first supply-side current has met or exceeded a magnitude threshold for at least a duration threshold, the first supply-side current is reduced such that the first supply-side current is less than the magnitude threshold. A data signal may also be transmitted by embedding a data signal in the first remote-side current through the modulation of the first remote-side current, and demodulating the data signal in the first supply-side current.

Abstract: A surge suppression protection circuit is provided. The surge suppression protection circuit includes an input voltage detector circuit, a reference voltage generator circuit, an operational amplifier and a first switch component. A first terminal of the first switch component is coupled with an input voltage. A second terminal of the first switch component is grounded. A control terminal of the first switch component is connected to an output terminal of the operational amplifier. The input voltage detector circuit detects the input voltage to output a first input detected voltage. The reference voltage generator circuit outputs a first reference voltage. The operational amplifier amplifies a difference between the first input detected voltage and the first reference voltage by a gain to output an operational amplified signal. The first switch component operates according to the operational amplified signal from the operational amplifier.

Abstract: The present invention relates to an injection device for wireless power transfer comprising an RF signal generator configured to generate a Radio Frequency (RF) signal of a predetermined frequency; an injection probe connected to the RF signal generator, wherein the injection probe is configured to be coupled to an electrical cable comprising at least one conductor; wherein the injection probe comprises circuitry for injecting the RF signal as a surface electromagnetic wave into said electrical cable. The invention also relates to a system for wireless power transfer.

Abstract: An irrigation system comprises an irrigation controller that receives user input and provides a power signal and command and message data to an encoder. The encoder encodes the command and message data onto the power signal to provide a data encoded power waveform that is sent over a two-wire path. The irrigation system further comprises one or more decoders in communication with the two-wire path to receive the data encoded power waveform and one or more irrigation valves in communication with the one or more decoders. The data encoded power waveform provides power to the decoders and the decoders decode the command and message data from the data encoded power waveform to control the irrigation valves according to the user input.

Abstract: The present disclosure is directed to self-synchronizing devices that can connect and self-synchronizes voltage, frequency and phase of two or more power sources. The disclosed embodiments enable a modular power system to serve as the primary or secondary source of power for applications requiring loads from a few kilowatts (kW) to the scale of megawatts (MW). The modular system is generalized to use either a single or multiple power generation sources at once, with the ability to connect and self-synchronize voltage, frequency, and phase of a variety of different types of power sources. Power control systems designed to function with self-synchronizing technology enable a modular power system to satisfy a wide variety of needs, simplifying the existing method of achieving synchronization and enabling new features of resiliency and expandability. The self-synchronization can be implemented into a wide variety of electronics including but not limited to inverters and generator controllers.

Abstract: A redundant power supply control device controls a sub-battery capable of backing up the main battery. The control device includes an acquisition unit, an estimation unit, and a determination unit. The acquisition unit obtains a voltage value and a current value of the sub-battery. The estimation unit estimates the storage rate of the sub-battery by current integration. The determination unit determines whether the sub-battery can be backed up. The determination unit calculates a first resistance value that is an internal resistance value of the sub-battery estimated based on the measured voltage value and the measured current value, and calculates a second resistance value that is an internal resistance value of the sub-battery estimated based on the estimated voltage value and the measured current value. The determination unit determines whether the sub-battery can be backed up based on the larger one of the first resistance value and the second resistance value.

Abstract: Provided is a power feeding unit mounted on a swivel joint, the power feeding unit including: a rotary transformer that is coupled to an upper swing body and a lower traveling body of a work vehicle, respectively; an oscillation circuit that is coupled to the upper swing body, converts electric power into an alternating current, and supplies the alternating current to the rotary transformer; and a smoothing circuit that is coupled to the lower traveling body and converts electric power output from the rotary transformer into a direct current, in which an electrode on a negative side of the smoothing circuit is electrically coupled to a housing of the lower traveling body, and an electrode on a positive side of the smoothing circuit is taken out from a lower portion of the swivel joint via a cable inserted through a pipe provided inside the swivel joint along an axial direction.

Abstract: A transfer switch for transferring power to a building is disclosed. The transfer switch may include a detection unit configured to monitor a utility power supply from a power grid. The transfer switch may further include a processor configured to determine that a power supply communication between the transfer switch and a vehicle is established, and determine that a predefined condition is met based on inputs associated with the utility power supply obtained from the detection unit, when the power supply communication is established. The processor may be further configured to enable the vehicle to supply power to the building responsive to a determination that the predefined condition is met.

Abstract: A system includes a breaker set, an inverter operatively connected to the breaker set, and at least one direct current (DC) voltage converter operatively connected to the inverter. A microgrid interconnection device (MID) can be operatively connected to the breaker set. A controller provides smart functionality for energy production, distribution, and control among residential sources and loads connected to the system. The controller, the breaker set, the MID, the inverter, and the at least one DC voltage converter can be housed within an enclosure.

Abstract: A micro inverter and a control method therefor, an uninterruptible power supply, and a power supply system. The micro inverter includes a primary-side winding, a first secondary-side winding, a second secondary-side winding, a first power conversion, a second power conversion circuit and an energy storage buffer circuit. When the micro inverter generates double frequency ripple power, a controller controls the energy storage buffer circuit to perform charging in a first time period, so that energy from the first power conversion circuit is absorbed by using the transformer to perform energy buffering, and controls the energy storage buffer circuit to perform discharging in a second time period, so that energy is transferred to the second power conversion circuit by using the transformer. According to the embodiments, a volume of the micro inverter can be reduced, costs are reduced, and reliability of a power converter is improved.

Abstract: An ESD protection circuit using GaN devices, with a ESD block including a first 2 DEG resistor with one terminal coupled to a gate of a power HEMT, a first trigger with one terminal coupled to another terminal of the first 2 DEG resistor and with another terminal coupled to a reference voltage, a first LV-HEMT with a first gate coupled to the another terminal of the first 2 DEG resistor and a first drain couple to the gate, a second trigger with one terminal coupled to the gate, a second 2 DEG resistor with one terminal coupled to another terminal of the second trigger and another terminal coupled to the reference voltage, and a second LV-HEMT with a second gate coupled to the another terminal of the second trigger and a second drain coupled to the first source and a second source coupled to the reference voltage.