Abstract: The disclosure describes a voltage source inverter having an internal control loop with a setpoint input for a setpoint signal for an active power component of the inverter, and an actual value input for a current actual value of the active power component of the inverter. The inner control loop is a controller with a proportional component and an integral component and is configured to determine a frequency shift as a controller output variable from the difference between the setpoint signal and the current actual value. The inverter is configured to provide an AC voltage that deviates from a predefined fundamental frequency by the determined frequency shift. An outer control loop of the inverter is configured to supply a setpoint signal to the setpoint input as a function of the determined frequency shift in islanded operation. A power generation system can comprise two such inverters.

Abstract: The present invention discloses a reactive power sharing method for parallel inverters based on virtual impedance and a dynamic droop coefficient. The virtual impedance is constructed through the parameter design of voltage and current double-closed loop controllers and a line impedance observer, to realize power decoupling. A dynamic droop coefficient is constructed to adjust the output voltage of a virtual synchronous generator adaptively, and the output reactive power of inverters is controlled indirectly to achieve reactive power sharing according to capacities. The present invention does not need a communication network between the inverters, and only needs the local variable information of each inverter, so that a microgrid has the function of “plug and play”.

Abstract: A portable measuring instrument is a portable measuring instrument that receives power transferred from a wireless power transfer apparatus for transferring power wirelessly, the measuring instrument includes a plurality of power receiving antennas that receive power transmitted from the wireless power transfer apparatus, a posture detection part that detects a posture of the measuring instrument, and a signal transmission part that transmits a beacon signal including information indicating the posture detected by the posture detection part, wherein after the signal transmission part transmits the beacon signal, any of the plurality of power receiving antennas receives power from the wireless power transfer apparatus.

Abstract: A system to manage power consumption from a grid includes a building switchgear; an energy storage system (ESS) coupled to the building switchgear to selectively provide power in response to a customer power demand to prevent a customer grid power consumption from spiking and peaking at grid imbalance highest cost on peak times.

Abstract: The inventive technology, in certain embodiments, may be generally described as a solar power generation system with a converter, which may potentially include two or more sub-converters, established intermediately of one or more strings of solar panels. Particular embodiments may involve sweet spot operation in order to achieve improvements in efficiency, and bucking of open circuit voltages by the converter in order that more panels may be placed on an individual string or substring, reducing the number of strings required for a given design, and achieving overall system and array manufacture savings.

Abstract: Embodiments of the invention provide IGBT circuit modules with increased efficiencies. These efficiencies can be realized in a number of ways. In some embodiments, the gate resistance and/or voltage can be minimized. In some embodiments, the IGBT circuit module can be switched using an isolated receiver such as a fiber optic receiver. In some embodiments, a single driver can drive a single IGBT. And in some embodiments, a current bypass circuit can be included. Various other embodiments of the invention are disclosed.

Abstract: A microinverter for use with a single photovoltaic (PV) panel. The self-contained unitary package includes a low voltage power module (LVPM), a high voltage power module (HVPM), a transformer passing power between the two modules, a DC filter to filter incoming DC power from the PV panel, and an AC power to filter 3-phase power to be provided to an AC power bus connected to an AC power grid. The microinverter package couples to a single PV panel and converts incoming DC power from the PV panel to 3 phase AC power suitable for the AC power grid. All necessary electronics and conversion circuitry and components are contained in the package and provides a plug and play solution between the PV panel and the AC grid.

Abstract: A power transmitting apparatus measures a waveform attenuation rate of a transmission power waveform, at a transmission antenna, in a state in which the power transmission by the power transmitting is restricted, sets a threshold used for detecting a foreign object between the power transmitting apparatus and the power receiving apparatus on the basis of the measured waveform attenuation rate, and determines whether or not the foreign object is present on the basis of the waveform attenuation rate measure after the threshold is set and the threshold.

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.