Abstract: In accordance with various embodiments of the present disclosure, a method for confirming kickback is provided. In some embodiments, the method for confirming kickback comprises, in response to an indication of a kickback occurrence, comparing an input current to a predetermined current threshold; if the input current is greater than the predetermined current threshold for a first predetermined amount of time, generating a kickback interrupt signal; if the input current is not greater than the predetermined current threshold, comparing an input voltage to a predetermined voltage threshold; if the input voltage is less than the predetermined voltage threshold for a second predetermined amount of time; generating a kickback interrupt signal; and if the input voltage is not less than the predetermined voltage threshold and the input current is not greater than the predetermined current threshold, generating a false positive (FP) signal.

Abstract: A voltage regulation method for a multi-converter parallel connection system is provided. The multi-converter parallel connection system includes N converters. Alternating-current sides of the N converters are connected to an alternating-current bus. N is an integer greater than or equal to 2. M converters among the N converters are switched from a current-source operation mode to a voltage-source operation mode to form an alternating-current bus voltage, when the N converters are disconnected from a power grid or the power grid fails. M is an integer less than or equal to N. Remaining N-M converters among the N converters are switched from the current-source operation mode to the voltage-source operation mode after the alternating-current bus voltage is formed.

Abstract: A microgrid has a microgrid controller that controls power delivery from two or more energy sources to one or more microgrid loads. A prediction is made as to when a main power grid may lose power. The microgrid controller operates in a prepare for islanding mode when a future loss of power is predicted, during which power received from the main power grid source, a solar power source and/or a wind power source are prioritized over energy costs and CO2 emissions to charge the battery power source to a prepare for islanding charge level. The microgrid controller operates in an islanding mode when the main power grid source loses power, during which power received from the solar power source, the wind power source, the battery power source and/or a diesel generator power source are prioritized to maximize a time that the microgrid can remain powered.

Abstract: The present application discloses a power supply system and an electronic device. A first power supply unit includes a plurality of voltage converters, each voltage converter being communicated with a corresponding load unit. A second power supply unit includes a plurality of voltage division components, each voltage converter being connected to a corresponding next-level load unit by means of one voltage division component. A monitoring unit is used for acquiring state information of each load unit and transmitting the state information to a control unit. The control unit is separately connected to an electrical double-layer capacitor, the first power supply unit, and the second power supply unit, so as to control, when state information of a target load unit is abnormal, the voltage division component connected to the target load unit to be conducted, and supplement power for the target load unit by means of the electrical double-layer capacitor.

Abstract: A power supply equipment supplies power to a critical load and a non-critical load. The power supply equipment includes a plurality of power supplies coupled in parallel and a system controller. The system controller is coupled to the power supplies, and communicates with the power supplies to set a specific sequence. The system controller notifies the power supplies to adjust operating frequencies to be inconsistent according to the specific sequence.

Abstract: A photovoltaic inverter includes a conversion circuit, a collection circuit, and a controller. The collection circuit is configured to obtain a positive direct current bus voltage and a negative direct current bus voltage of the conversion circuit. The controller is configured to generate an even-order harmonic voltage regulation signal based on the positive direct current bus voltage and the negative direct current bus voltage of the conversion circuit and a phase of an output voltage of the photovoltaic inverter, generate a drive control signal based on the even-order harmonic voltage regulation signal, and control a switching transistor in the conversion circuit to be turned on or off to control the conversion circuit to output a target voltage and reduce a difference between the positive direct current bus voltage and the negative direct current bus voltage of the conversion circuit.

Abstract: A method of signaling between a photovoltaic module and an inverter module. The inverter module is connected to the photovoltaic module. In an initial mode of operation an initial code is modulated thereby producing an initial signal. The initial signal is transmitted from the inverter module to the photovoltaic module. The initial signal is received by the photovoltaic module. The operating mode is then changed to a normal mode of power conversion, and during the normal mode of operation a control signal is transmitted from the inverter to the photovoltaic module. A control code is demodulated and received from the control signal. The control code is compared with the initial code producing a comparison. The control command of the control signal is validated as a valid control command from the inverter module with the control command only acted upon when the comparison is a positive comparison.

Abstract: A high power (HP) generator includes a plurality of low power (LP) generators, a coupling in which the plurality of LP generators is electrically connected, and a control unit. During operation, a coupling-value at an output of the coupling is higher than an LP-generator-value at an output of one of the plurality of LP generators. The control unit is configured to select a contribution of each LP generator to an output value of the HP generator, in a way that one or a combination of following is accomplished: (i) the output of the coupling and/or the output of the HP generator is a step function, (ii) the plurality of LP generators is activated sequentially during a pulse, (iii) at least one amplitude step is lower than 1 kV, and (iv) the plurality of LP generators is connected by switching only.

Abstract: A battery self-heating system includes: a power battery pack, a first heating device, a second heating device and a controller. The power battery pack includes a first battery group and a second battery group connected in series; the first heating device includes a first heating sub-device and a second heating sub-device; the second heating device includes a third heating sub-device and a fourth heating sub-device; and the controller is configured to: control the first heating device and the first battery group to be alternately charged and discharged, control the second heating device and the second battery group to be alternately charged and discharged, and control, when a first one of the first battery group and the second battery group is in a discharged state, a second one of the first battery group and the second battery group to be in a charged state.

Abstract: A microgrid system includes a plurality of energy resource systems, including direct current (DC) energy resource systems and alternating current (AC) energy resource systems, configured to supply power to a microgrid; a plurality of local controllers respectively associated with an energy resource system for controlling the respective energy resource system; and a microgrid controller. Each local controller is configured to determine an available output power for a respective energy resource system based on one or more operational constraints, and transmit an indication of the available output power to the microgrid controller. The microgrid controller is configured to determine, based on the available output power indicated by each local controller, a net available DC output power available from the DC energy resource systems and a net available AC output power available from the AC energy resource systems.

Abstract: An MPPT control method and device, and a storage medium are provided. Power loss at the direct-current side of the photovoltaic inverter and conversion efficiency loss in an inverter circuit in the photovoltaic inverter affect efficiency of the photovoltaic inverter. The direct-current loss indicates power loss occurring at a direct-current side of the photovoltaic inverter. The conversion efficiency loss indicates power loss in the inverter circuit. The photovoltaic inverter is MPPT controlled based on the direct-current loss and/or the conversion efficiency loss. Therefore, the efficiency of the photovoltaic inverter can be improved based on the direct-current loss and/or the conversion efficiency loss, thereby increasing energy yield of the photovoltaic system.

Abstract: A transfer time for transferring power from a first power source to a second power source, and an inrush current not be exceeded during the transfer are obtained. A phase difference between the first power source and the second power source is determined based on electrical measurements from the first power source and the second power source. The first power source is disconnected from a load based on a detected disturbance with the first power source. One or more flux bands are determined based on the phase difference, the transfer time, and the inrush current. A first connection between the second power source and the load is initiated by instructing each switch of a corresponding semiconductor switch assembly of the second power source to turn on at certain times based on flux matching using the determined one or more flux bands.

Abstract: A power supply system for an electrically driven wellsite facility is provided. The power supply system includes a combined power supply module configured to be connected with the electrically driven wellsite facility, the combined power supply module comprising at least one generator (or energy storage unit) and at least one power distribution station, wherein the at least one generator (or energy storage unit) and the at least one power distribution station are connected in series, disposed in parallel, or combined to a power grid for supplying power to the electrically driven wellsite facility.

Abstract: The electric bicycle self-recharging system is intended to provide continuous generation of electricity from the rotation of an electric bicycle's wheel to recharge the electric battery. To accomplish this, a permanent magnet generator is rotatably connected to the corresponding wheel of the electric bicycle using a belt that transfers the torque from the wheel to the permanent magnet generator. The generated Alternating Current (AC) electricity is then converted into Direct Current (DC) electricity which can be used to recharge the electric bicycle's battery while the electric bicycle is in motion. The user can also opt to not recharge the electric bicycle's battery but to only recharge a secondary battery while the electric bicycle is in motion. The secondary battery enables the recharging of the electric bicycle's battery when the electric bicycle is not in motion. Furthermore, the system provides various safety features that protect the electric bicycle and the user.

Abstract: A high power (HP) generator includes a plurality of low power (LP) generators, a coupling in which the plurality of LP generators is electrically connected, and a control unit. During operation, at least in some states of the HP generator, a coupling-value at an output of the coupling is higher than an LP-generator-value at an output of one of the plurality of LP generators. The control unit is configured to select a respective contribution of each of the plurality of LP generators in order to generate a rise and/or a decay of a pulse at the output of the coupling, in a sequenced way through the plurality of LP generators. At least one pulse sequence uses a different contribution of the plurality of LP generators as a previous sequence or begins on a different LP generator as in the previous sequence.

Abstract: A system for frequency regulation in a AC power supply system is disclosed, wherein the system comprises an uninterruptible power supply being electrically connected to the AC power supply system and comprising a phase-locked loop and/or a frequency-locked loop for monitoring the frequency of an AC input voltage received from the AC power supply system, wherein the phase-locked loop and/or the frequency-locked loop is/are designed to be operated with an operation frequency being higher than a nominal grid frequency and being selected to detect a deviation of the monitored frequency from the nominal grid frequency within a predefined time span after a frequency drop-off of the monitored frequency occurred, wherein a control signal (19) is generated based on the detected deviation of the monitored frequency from the nominal grid frequency, and wherein the generated control signal is used to regulate the power flow between the uninterruptible power supply.

Abstract: The present application relates to a battery management and control system for a flow battery. An example battery management and control system includes an alternating current distribution box, a rectifying and inverting device, a flow battery including a battery pack that outputs direct current power, a positive electrode pump driver, and a negative electrode pump driver. The rectifying and inverting device connected to the battery pack inverts the direct current power into alternating current power and outputs the alternating current power. The alternating current distribution box is connected respectively to a power grid, the rectifying and inverting device, the positive electrode pump driver and the negative electrode pump driver. The box continuously supplies alternating current power to at least one of the positive electrode pump driver, the negative electrode pump driver or an additional system from either the power grid or the rectifying and inverting device.

Abstract: A universal power conversion system for a solar panel array includes a first solar panel generating a first power output; a second solar panel generating a second power output different from the first power output; a common DC bus in communication with the first and second solar panels; a first switching power converter between the first solar panel and the common DC bus, which receives the first power output, and outputs a third power output at a first MPP; a controller which receives, from the common DC bus, the third power output at the first MPP and the second power output in parallel with the third power output. The second power output is maintained at a second MPP to achieve an MPP-maintained fourth power output. The controller further combines the third power output with the MPP-maintained fourth power output, and produces a combined output for a destination sink.

Abstract: A system for balancing and converting voltage output from photovoltaic modules includes a set of solar substrings and a power conversion circuit. The power conversion circuit includes a balancing section configured to balance voltage output from the set of solar substrings. The power conversion circuit also includes a voltage control section including: a first transformer coupled to the set of solar substrings and configured to step-up voltage from the set of solar substrings; a second transformer arranged in series to the first transformer; and an output capacitor coupled to the second transformer. The system further includes a controller configured to: drive a set of modulation signals to the balancing section and the voltage control section; alternate voltage polarities across the first transformer and the second transformer; and modify output voltage of the power conversion circuit to a target output voltage.

Abstract: A wireless power transfer system is disclosed. The wireless power transfer system includes a first converting unit configured to convert a first DC voltage of an input power to a first AC voltage. Further, the wireless power transfer system includes a contactless power transfer unit configured to receive the input power having the first AC voltage from the first converting unit and transmit the input power. Also, the wireless power transfer system includes a second converting unit configured to receive the input power from the contactless power transfer unit and convert the first AC voltage of the input power to a second DC voltage. Furthermore, the wireless power transfer system includes a switching unit configured to regulate the second DC voltage across the electric load if the second DC voltage across the electric load is greater than a voltage reference value.