Abstract: A power supply circuit includes PCU switches provided in respective positive wires of a first power source conduction path and a second power source conduction path which connect a first generator respectively to a first power transmission bus and a second power transmission bus, and further includes power transmission bus switches provided in respective negative wires of a first load conduction path and a second load conduction path which connect respectively the first power transmission bus and the second power transmission bus to a first load.

Abstract: An embodiment provides a DC-DC converter for sensing a grounded state and a method for controlling same in a photovoltaic energy storage system. Specifically, the converter can sense a grounded state on the basis of the magnitude of voltage applied to a resistor and provide a notification.

Abstract: A system for detecting current magnitudes in a circuit breaker panel includes multiple 3-sensor magnometers placed over the main breaker and branch circuits in the circuit breaker enclosure. The sensors communicate with a local processing node, which analyzes the raw data to compensate for external and local interference, and provides an estimated current measurement. The estimated current measurement is then communicated back to a user system which can then use the information to better manage current input and output.

Abstract: The invention relates to a method, electrical circuit arrangements and insulation monitoring devices for an interference-resistant insulation monitoring of an ungrounded power supply system having a converter. Switching-frequent interfering signals, which are caused by operating the converter, are identified and assessed in a measured displacement voltage independently of the detection of a measuring signal in order to derive a switching (off) signal if required. Complementary thereto, an interfering resistance with respect to low-frequency interfering portions generated by the converter is attained by these low-frequency interfering portions being generated from a replica of a pulse width modulation signal of the converter and being suppressed sufficiently via subtraction that a monitoring without gaps (frequency) of the insulation resistance becomes possible.

Abstract: The invention relates to a hybrid power plant for producing power to the electrical grid, the hybrid power plant comprising a plurality of energy assets; a first renewable power generating unit, such as wind turbine generators, and an energy storage unit, preferably a battery energy storage system. The hybrid power plant has a power plant controller arranged to communicate with the plurality of energy assets, and, when an under-frequency event occurs, the energy storage unit provides frequency support during the under-frequency event by providing additional power as a function of a state of charge of the energy storage unit at the time when the under-frequency event occurs. Thus, during an under-frequency event, it is possible to obtain a more stable power output from the hybrid power plant.

Abstract: The invention relates to a method for controlling an electricity feed to an electricity grid (12) from a load side of an electric circuit (5), comprising the steps of: a) Providing a electricity feed with an associated feed duration to a controller (13) of an electric power converter (7); b) The controller (13) commissioning the electric power converter (7) to provide the electricity feed, until the electricity feed and feed duration is provided anew or until the feed duration expires. The invention further relates to a system for controlling an electricity feed of an electric source.

Abstract: An electrical energy storage system includes a battery configured to store electrical energy and discharge the stored electrical energy to an external system, a switch electrically connected to the battery and operable to connect the battery to the external system and disconnect the battery from the external system, a sensor configured to measure an open circuit voltage of the battery while the battery is disconnected from the external system, and a controller. The controller is configured to predict usage of the battery at a plurality of future times, schedule a time to disconnect the battery from the external system based on the predicted usage of the battery at the plurality of future times, operate the switch to disconnect the battery at the scheduled time, and obtain a measurement of the open circuit voltage of the battery while the battery is disconnected.

Abstract: A power supply device disposed on an aircraft to provide a power to the aircraft is provided. The aircraft has an average required power value. The power supply device includes a secondary battery, a transformer and a fuel cell. The transformer is coupled between the secondary battery and the aircraft. The fuel cell is coupled to the aircraft and is adapted to provide a first output current to the aircraft. The transformer has an output voltage set value. When the first output end voltage of the fuel cell is lower than the output voltage set value, the transformer provides a second output current of the secondary battery to the aircraft. The output voltage set value is in a voltage range with a fuel cell output power between the maximum power value of characteristic curve of the fuel cell and the average required power value of the aircraft.

Abstract: A power device capable of displaying various statuses and a displaying method are provided. The power device includes: a central microprocessor, a power conversion circuit, an LED bar (or a light bar) circuit, and a battery pack. The central microprocessor intrinsically has color setting and control logic and is internally provided with a color setting and control logic circuit. The power device is externally connected to a utility power source, a solar photovoltaic power source, a backup battery pack, and a load. The color setting and control logic circuit enables the LED bar circuit to correspondingly emit LED light of at least two colors according to different power sources supplied to the load or a battery capacity, and the LED light is displayed in a breathing-like manner. The central microprocessor adjusts a breathing rate of the LED light according to a power consumption of the load.

Abstract: A method for controlling a wind turbine is disclosed. During full load operation, a power reference value, Pref, representing a power level to be supplied to the power grid by the wind turbine, is received, and the wind turbine is controlled in order to produce an output power which is at or near the power reference value, Pref, while maintaining a constant torque on the generator. In the case that the produced output power of the wind turbine exceeds the power reference value, Pref, excess produced energy is stored in the energy storage system, and in the case that the produced output power of the wind turbine is below the power reference value, Pref, stored energy is retrieved from the energy storage system. A power level being equal to the power reference value, Pref, is supplied to the power grid.

Abstract: A method and a system for controlling a distributed power generation system are disclosed. The distributed power generation system includes N sub isolated three-port converters and N independent distributed DC power sources in a one-to-one correspondence to the N sub isolated three-port converters, N is a natural number greater than 1; an input-port of each of the sub isolated three-port converters is connected to the corresponding distributed DC power source, bidirectional-ports of the sub isolated three-port converters are connected in parallel to build a low voltage DC bus, and output-ports of the sub isolated three-port converters are connected in series and connected to a medium voltage DC distribution network.

Abstract: Renewable electrical energy is provided with aspects and circuitry that can harvest maximum power from an alternative electrical energy source (1) such as a string of solar panels (11) for a power grid (10). Aspects include: i) controlling electrical power creation from photovoltaic DC-AC inverter (5), ii) operating photovoltaic DC-AC inverter (5) at maximal efficiency even when MPP would not be, iii) protecting DC-AC inverter (5) so input can vary over a range of insolation and temperature, and iv) providing dynamically reactive capability to react and assure operation, to permit differing components, to achieve code compliant dynamically reactive photovoltaic power control circuitry (41). With previously explained converters, inverter control circuitry (38) or photovoltaic power converter functionality control circuitry (8) configured as inverter sweet spot converter control circuitry (46) can achieve extraordinary efficiencies with substantially power isomorphic photovoltaic capability at 99.

Abstract: Systems and methods for controlling power flow to and from an energy storage system are provided. One energy storage system includes an energy storage device and a bidirectional inverter configured to control a flow of power into or out of the energy storage device via a plurality of phases. The energy storage system further includes a controller configured to control the bidirectional inverter based on a load condition on one or more phases. The controller is configured to control the bidirectional inverter to store power generated by a generator set in the energy storage device and transmit power from the energy storage device to a load driven by the generator set in response to detecting a load imbalance between the phases.

Abstract: An on-line uninterruptible power system and an operation method thereof are provided. The on-line uninterruptible power system comprises a first switch unit, a second switch unit, a charging circuit, a DC-AC conversion circuit, a power factor correction circuit and a control circuit. When the on-line uninterruptible power system is in a line mode, the control circuit controls the operation of the power factor correction circuit to limit the magnitude of its input current to not exceed a first predetermined value.

Abstract: Systems and methods are provided, which facilitate operations planning, dispatch, regulation control, and autonomous control performance. The disclosure also facilitates systems and methods for utilization of synthetic primary frequency response, synthetic inertia, regulation and load following/ramping reserve capabilities from Demand Response and Distributed Energy Resources for balancing demand and supply and maintaining frequency levels across a power grid.

Abstract: A power conditioning unit includes unit a rectifier having an input terminal coupled to a power transfer unit output terminal and a regulator having an input terminal coupled to an output terminal of the rectifier. The power conditioning unit also includes an energy buffer coupled to an output terminal of the regulator. The power conditioning unit includes an inverter having an input terminal coupled to the energy buffer and having an output terminal configured to couple to a load.

Abstract: An energy harvesting sensor node includes an energy harvesting sensor, an energy storage device, and a transceiver. The energy harvesting sensor is configured to extract energy from an external source at a rate proportional to a value of a first parameter of the external source. The energy storage device is configured to store the extracted energy from the energy harvesting sensor at the rate proportional to the value of the first parameter. The transceiver is configured to transmit a plurality of data transmission frames at a frequency proportional to the value of the first parameter.

Abstract: In one embodiment, a power apparatus, includes at least one first and second power supply to receive power from a main power supply, the at least one first power supply including at least one first input capacitor to smooth voltage ripples, a voltage monitor to monitor voltage provided by the main power supply, and cause enablement and/or disablement of at least one part of the at least one first power supply according to the voltage provided by the main power supply, and at least one first blocking and passing component configured to selectively channel energy from the main power supply to charge the at least one first input capacitor during a time when the at least one part is enabled, and channel energy from the at least one first input capacitor to the at least one second power supply during a time when the at least one part is disabled.

Abstract: A power supply comprises an inverter leg adapted to generate a first pulse width modulation signal by modulating an input signal, a phase shifter, which is adapted to generate a provisional second pulse width modulation signal by phase shifting a signal from which the first pulse width modulation signal is derived, a compensator, which is adapted to determine a second pulse width modulation signal from the provisional second pulse width modulation signal and add a compensation signal during the generating of the second pulse width modulation signal, and a coupled inductor, which is adapted to combine the first pulse width modulation signal and the second pulse width modulation signal to form the output signal.

Abstract: A dual-output port charging circuit includes a primary switching circuit, a secondary first switching circuit, a secondary second switching circuit, a transformer connected to the three circuits, and a controller. The controller receives and samples an output voltage and an output current of the secondary second switching circuit, the output voltage and the output current are compared with a reference value, and a compensation is made, so as to eventually control an on-off time of a switch in the primary switching circuit; and the controller receives and samples an output current of the primary switching circuit, a zero-cross delay is calculated through a zero detection, so as to control an on-off time of a rectification switch in the secondary second switching circuit. One controller is used to flexibly control voltages of two direct current output ports with accurate voltage regulation and strong antijamming capability.

Abstract: A battery control device controlling an operation of a battery connected to a power system includes detection means that detects battery-related information showing a state of the battery, or a state of an interconnection point of the power system and the battery, first communication means that transmits a detection result of the detection means to an external device, and executes reception processing to receive operation control information to control the operation of the battery from the external device at a predetermined time interval, and control means that executes battery operation control processing to control the operation of the battery based on a state of the power system and based on the operation control information received by the first communication means, at a time interval shorter than the predetermined time interval.

Abstract: Devices, systems, and methods may use a low current power source to charge an intermediate storage unit, providing sufficient electric power to perform various device functions. A voltage of the intermediate storage unit may be monitored using a voltage monitoring circuit, and a primary storage unit may be charged using current from the intermediate storage unit when the voltage of the intermediate storage unit meets a threshold.

Abstract: Methods and systems are provided for adjusting engine idle-stop based on operation of an on-board generator. In one example, during operation of the generator to power an external load, a method may include inhibiting engine shut-down based on input from a user.

Abstract: Method and apparatus for generating power. In one embodiment the method comprises determining a value of a DC parameter pertaining to a DC power source providing DC power to an inverter; comparing the value to a threshold; and operating the inverter to generate positive power or negative power based on a result of comparing the value to the threshold.

Abstract: Inrush current to a load at the time of a power outage is reduced. A power control apparatus includes an inverter and a controller. When the controller detects a power outage in a power grid, the controller performs control so that output voltage supplied from the inverter to a switching device rises to an operating voltage. The operating voltage is the voltage at which the switching device operates to switch from electric power supplied to load devices from the power grid to electric power from the inverter. The controller also performs control to maintain the output voltage at or below the operating voltage when the output voltage reaches the operating voltage and then performs control so that the output voltage rises to a predetermined voltage exceeding the operating voltage.

Abstract: Sensor apparatus (14) is provided, comprising a receiving device (20) by way of which the sensor apparatus (14) is wirelessly suppliable with electrical energy, a transmission device (44) by way of which data are wirelessly transmittable, a sensitive device (26), at least one data processing device (30) which is signal-operatively coupled to the sensitive device (26) and the transmission device (44) and which processes data of the sensitive device (26) and provides edited data as transmission data to the transmission device (44), and a device (52) for an interruption-tolerant operation of the sensor apparatus (14) with respect to the electrical energy supply, wherein the device (52) for an interruption-tolerant operation is realized by hardware and/or software of the sensor apparatus (14).

Abstract: The present invention is a plurality of solar power cells that each employs thermogenerators that are centered in a primary pool of silver metal surrounded by a secondary pool of silver metal in order to sense and absorb sunlight, directly and indirectly, and to absorb heat in order to produce electrical energy. The electrical current produced by the thermogenerators is then combined, balanced, converted to AC power, stepped up in voltage, and conditioned before being available for admission into the power grid.

Abstract: The present application relates to a service battery charging management device and method for power supply of a recreational vehicle, wherein, the service battery charging management device for power supply of recreational vehicle includes: a vehicle generator, a solar cell panel, a MCU main control unit, an input automatic switching unit, a charging main converting DC/DC circuit, a service battery, a PWM mode charging unit, and a load. The MCU main control unit controls the input automatic switching unit according to an output voltage of the solar cell panel and an output voltage of the vehicle generator, which enables the solar cell panel and the vehicle generator to selectively serve as a charging power supply of the service battery to enable the service battery to be kept in an alternative-charging state, so that normal power supply of household electricity consumption of the recreational vehicle can be guaranteed.

Abstract: Attributes of a power system having one or more distributed energy resources are characterized by continuously receiving data comprising a power data stream having at least two components and derived from at least one distributed energy resource. A control data stream comprising at least two components is generated. An error data stream is determined based on a difference between respective components of the power data stream to components of a reference data stream comprising at least two components. The error data stream and the reference data stream are processed to generate the control data stream. The control data stream is continuously output to enable control and/or monitoring of the power flow of at least one distributed energy resource.

Abstract: Systems and methods for controlling power flow to and from an energy storage system are provided. One energy storage system includes an energy storage device and a bidirectional inverter configured to control a flow of power into or out of the energy storage device via a plurality of phases. The energy storage system further includes a controller configured to control the bidirectional inverter based on a load condition on one or more phases. The controller is configured to control the bidirectional inverter to store power generated by a generator set in the energy storage device and transmit power from the energy storage device to a load driven by the generator set in response to detecting a load imbalance between the phases.

Abstract: According to at least one aspect, embodiments herein provide a traffic light power management system comprising a power source, a first output, a service bypass unit and a power management unit. The service bypass unit is configured to receive AC power from the power source, convert the AC power to a first DC power in a first mode of operation, provide the first DC power to the first output in the first mode of operation, and provide the AC power to a power management unit in a second mode of operation. The power management unit is coupled to the service bypass unit, and is configured to receive the AC power from the service bypass unit in the second mode of operation, convert the AC power to a second DC power in the second mode of operation, and provide the DC power to the first output in the second mode of operation.

Abstract: A vehicle control apparatus includes a switch, a first control unit, and a second control unit. The switch is switchable between an electrically conductive state that allows a first electricity storage device to be coupled to a power supply circuit and a cutoff state that allows the first electricity storage device to be isolated from the power supply circuit. The first control unit includes a first cutoff controller configured to transmit a cutoff signal to the switch and a self-diagnostic unit configured to detect a malfunction of the first cutoff controller. The second control unit is coupled to the first control unit through a communication network, and includes a second cutoff controller configured to transmit the cutoff signal to the switch. The second control unit is configured to transmit the cutoff signal from the second cutoff controller to the switch when the self-diagnostic unit detects the malfunction.

Abstract: Provided is a control device of a home energy management system (HEMS). The control device includes a communication unit configured to connect to a HEMS gateway and a terminal, a storage unit configured to store information on a power consumption per hour of each of home appliances connected to the HEMS gateway, and a control unit configured to receive usage information including a power usage amount of each of the home appliances and power generation information including a power generation amount of a photovoltaic (PV) module, match the power usage amount of each of the home appliances with the power generation amount of the PV module on the basis of the received usage information and power generation information, and generate usage information of PV power for each home appliance on the basis of the matching result.

Abstract: An object is to reduce influence of erroneous operation in a monitoring system provided with a sensor. Lighting equipment is to be turned on by means of main power. A remote control device turns off the lighting equipment. A battery supplies reserve power. A sensor performs predetermined measurement by means of the main power. A detector detects whether or not supply of the main power has been stopped by operation of a predetermined switch, and generates a detection result. A communicator transmits the detection result by means of the reserve power in a case where the supply of the main power has been stopped.

Abstract: A system includes a DC to DC converter coupled with a load, a power source bus coupled with an input of the DC to DC converter, and an energy storage device. The energy storage device and an output of the DC to DC converter are coupled with a load bus, which supplies the load. The power source bus is supplied power by a generator being driven by a gas turbine. During operation, an operational temperature of the gas turbine may be received by the controller. The controller may dynamically adjust a demand output of the DC to DC converter in response to the operational temperature of the gas turbine exceeding a predetermined threshold temperature value for a predetermined period of time.

Abstract: Provided is a control device of a home energy management system (HEMS). The control device includes a communication unit connected to an HEMS gateway, a storage unit configured to store information on power consumption of each of home appliances connected to the HEMS gateway, and a control unit configured to predict a power generation amount of a photovoltaic (PV) module connected to the HEMS gateway and generate information on usable time of each of the home appliances on the basis of the predicted result and the information on the power consumption.

Abstract: An electric apparatus according to an embodiment includes a plurality of connection devices connectable to a plurality of external power supplies; a battery; a charge circuit to charge the battery using electric power supplied from the external power supplies; a plurality of switch sections each connected between the connection devices and the charge circuit; a storage section to store therein a priority degree for supplying power to the battery for each power supply type of the external power supplies; and a controller to control power supply from the external power supplies to the charge circuit. The controller detects power supply types of the external power supplies connected to the connection devices, and compares priority degrees corresponding to the power supply types detected and switches off the switch sections of the connection devices that are connected to the external power supplies except an external power supply having a highest priority degree.

Abstract: A method reduces inrush currents in a transformer-less rectifier UPS system when an input circuit breaker of the UPS system is closed from an open position. The circuit breaker is coupled between an AC power input and an AC input of a rectifier of the UPS system and a DC output of the rectifier is coupled to a DC bus of the UPS system. Before the circuit breaker is closed, the DC bus is charged to a DC voltage having a level that is equal to a peak AC voltage level of a line-line AC voltage of AC input power to the UPS system. The rectifier is operated as an inverter to provide an AC output voltage at the AC input of the rectifier that is equal to an AC voltage at the AC power input and when it is equal, the circuit breaker is closed.

Abstract: A large capacity battery system for managing a large capacity battery used for power system frequency regulation and a large capacity battery operation method are provided. The method may include the steps of: calculating an estimated frequency regulation signal for the next day using history information of past frequency regulation signals; calculating a bidding capacity and a basic value for the large capacity battery, matched to the estimated frequency regulation signal; and determining an operation plan using the calculated bidding capacity and basic value; bidding the bidding capacity and basic value for the large capacity battery according to the operation plan on the day-ahead frequency regulation market.

Abstract: A method, an arrangement and a computer program for controlling an energy flow to a grid, from an electrical alternating current machine with unbalanced impedance, in particular an electrical alternating current generator of a wind turbine, the method comprising: obtaining a first power signal representing a first power command.

Abstract: A charging system (C-SYS) for charging at least one energy storage device (ESD) of a power grid (PG) according to a response curve (RC) indicating a power supplied by said energy storage device (ESD) to said power grid (PG) or absorbed by said energy storage device (ESD) from said power grid (PG) depending on at least one grid parameter of said power grid (PG), wherein in a dead band (DB) around a target value of said grid parameter a selected response curve (RC) is applied.

Abstract: An energy storage device for a photovoltaic system includes: at least one first energy store which has a first cycle stability; at least one second energy store which has a second cycle stability, the first cycle stability being higher than the second cycle stability; and a control device which is designed to discharge the first energy store in a first operating mode and to discharge the second energy store in a second operating mode.

Abstract: A battery control device controlling an operation of a battery connected to a power system includes detection means that detects battery-related information that shows a state of the battery, or a voltage of an interconnection point of the power system and the battery, first communication means that transmits a detection result of the detection means to an external device, and receives operation control information to control the operation of the battery from the external device, and control means that controls the operation of the battery, based on a state of the power system and the operation control information received by the first communication means.

Abstract: A vehicle including an engine, a generator, a motor, a driving member and a control device. The generator includes a rotor, a stator having a stator core with a winding wound thereon, and an inductance adjustment device that changes an inductance of the winding by changing magnetic resistance of a magnetic circuit for the winding that passes through the stator core. The current adjustment device adjusts a current outputted from the generator to the motor, which drives the driving member. The control device, upon receiving a request for increasing the current to be supplied to the motor, directs the inductance adjustment device to adjust the generator to operate in a state in which the inductance of the winding is low, directs the engine to increase a rotation speed thereof to increase the rotational power, and directs the current adjustment device to increase the output current of the generator.

Abstract: A battery system comprising multiple battery packs. A battery pack of the battery packs includes a battery, voltage sense circuitry, a control circuit, a control switch and current regulation circuitry. The voltage sense circuitry senses a battery voltage of the battery and an input voltage of the battery pack. The control circuit is coupled to the sense circuitry and is operable for adjusting a level of a reference signal based on attribute data associated with the battery pack and a difference between the battery voltage and the input voltage. The control switch is operable for passing a battery current flowing through the battery. The current regulation circuitry is coupled to the control circuit and the control switch, and is operable for controlling the control switch to regulate the battery current according to the reference signal.

Abstract: Renewable electrical energy is provided with aspects and circuitry that can harvest maximum power from an alternative electrical energy source (1) such as a string of solar panels (11) for a power grid (10). Aspects include: i) controlling electrical power creation from photovoltaic DC-AC inverter (5), ii) operating photovoltaic DC-AC inverter (5) at maximal efficiency even when MPP would not be, iii) protecting DC-AC inverter (5) so input can vary over a range of insolation and temperature, and iv) providing dynamically reactive capability to react and assure operation, to permit differing components, to achieve code compliant dynamically reactive photovoltaic power control circuitry (41). With previously explained converters, inverter control circuitry (38) or photovoltaic power converter functionality control circuitry (8) configured as inverter sweet spot converter control circuitry (46) can achieve extraordinary efficiencies with substantially power isomorphic photovoltaic capability at 99.

Abstract: Embodiments are described for a hybrid amplification architecture that separates individual audio amplifier stages from the power supply and a simple two- or three-conductor bus that transmits both power and audio signal to a plurality of daisy-chained speakers to playback adaptive audio content in an expanded surround-sound environment including surround and overhead speakers or for use within professional live sound applications and/or distributed audio systems. A control unit generates digital audio and power and transmits both simultaneously over the bus to individual speaker units associated with each speaker. The speaker units recover the power decode the channel assignment to route the audio to the appropriate speakers.

Abstract: Provided are a power control apparatus, a power supply system, and a method for controlling a power supply system that can reduce the power loss when charging a storage battery from a power generation apparatus. A power control apparatus (power conditioner) controls connection between a storage battery and a power generation apparatus and includes a controller capable of selecting between a first electrical path in which the storage battery is connected to an inverter via a first power converter and the power generation apparatus is connected to the inverter via a second power converter, and a second electrical path in which the power generation apparatus is connected to the inverter via the second power converter and the storage battery is connected to an intermediate point between the power generation apparatus and the second power converter via the first power converter.

Abstract: An electrical energy storage system includes a battery configured to store electrical energy and discharge the stored electrical energy to an external system, a switch electrically connected to the battery and operable to connect the battery to the external system and disconnect the battery from the external system, a sensor configured to measure an open circuit voltage of the battery while the battery is disconnected from the external system, and a controller. The controller is configured to predict usage of the battery at a plurality of future times, schedule a time to disconnect the battery from the external system based on the predicted usage of the battery at the plurality of future times, operate the switch to disconnect the battery at the scheduled time, and obtain a measurement of the open circuit voltage of the battery while the battery is disconnected.

Abstract: A motor drive device that inputs AC power from a power supply to drive a motor includes: a converter that converts the AC power from the power supply into DC power; a DC/DC converter that generates DC power produced by stepping-up, stepping-down, or stepping-up and stepping-down the DC power from the converter; an inverter that converts the DC power from the DC/DC converter into AC power and supplies to the motor; and an electrical storage capacitor that is provided between the DC/DC converter and the inverter.