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 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: 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: 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: 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: 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 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.

Abstract: A system for providing power control for power transmission equipment may include multiple solid state on-load tap changers (SSOLTCs) electrically coupled to a phase of the power transmission equipment. The system may also include a sensor device configured to measure a parameter associated with power flowing through the phase of the power transmission equipment. The system may further include a controller communicably coupled to the SSOLTCs and the sensor device, where the controller is configured to obtain a measurement of the parameter from the sensor device at a point in time; determine that the parameter falls outside an acceptable operating range based on a current state of the SSOLTCs; determine a configuration of the SSOLTCs that, when implemented, results in the parameter returning to the acceptable operating range; and operate one or more of the SSOLTCs to achieve the configuration at the point in time.

Abstract: The present disclosure provides systems and methods for managing electrical energy generated by a renewable microgrid. One or more processors of a system may store priorities for one or more consumer loads; forecast an amount of available electrical energy for a time period; allocate a first electrical energy amount to a first consumer load to a first energy limit for the time period; determine more electrical energy is forecast to be available from the RES or the ESS for the time period; identify a second consumer load of the one or more consumer loads; allocate a second electrical energy amount to the second consumer load for the time period; and direct electrical energy from the RES or the ESS to the first and second consumer loads according to the allocations.

Abstract: A DC-coupled photovoltaic power generation system, an operating state switching method and device of the DC-coupled photovoltaic power generation system are provided according to the present disclosure. The method includes: obtaining photovoltaic energy of the DC-coupled photovoltaic power generation system and determining whether the photovoltaic energy is sufficient, in a case that the DC-coupled photovoltaic power generation system operates in a grid-connected battery priority state; and if it is determined that the photovoltaic energy is insufficient, performing an online switchover operation, where the online switchover operation is used to switch the operating state of the DC-coupled photovoltaic power generation system from the grid-connected battery priority state to a nighttime battery discharge state.

Abstract: A power supply system includes a solar light power generation device; a power storage apparatus; a charge/discharge device connected with the solar light power generation device and the power storage apparatus and connectable with power loads, the charge/discharge device storing power generated by the solar light power generation device on the power storage apparatus and discharging the power stored on the power storage apparatus to the power loads; a first setter setting a standard power storage amount as an amount of power to be stored on the power storage apparatus, the standard power storage amount being smaller than a power storage amount thereof in a fully charged state; and a first charge/discharge controller controlling the charge/discharge device to store the power generated by the solar light power generation device on the power storage apparatus at a level of the standard power storage amount or smaller.

Abstract: A common reference signal is used by a plurality of serially-connected power optimizers to manage a plurality of photovoltaic panels. It is determined whether an individual voltage output exceeds an individual limit. If so, a corresponding photovoltaic panel in the plurality of photovoltaic panels is adjusted to reduce the individual voltage output and the combined voltage output, where the combined voltage output is based at least in part on (a) the individual voltage output and (2) at least one other individual voltage output associated with another power optimizer. It is determined whether the combined voltage output relative to the common reference signal exceeds a maximum offset. If so, the corresponding photovoltaic panel in the plurality of photovoltaic panels is adjusted to reduce the individual voltage output and the combined voltage output.

Abstract: A method which is improved relative to the prior art for controlling electrical network variables in a feed network, in which the correlation between at least one feed variable measured at an input of the feed network and at least one network variable measured at an output of the feed network is described in a model-like manner using a model of the feed network. In the event of an incorrect description of the correlation, an adaptation of the model of the feed network is carried out, a feed variable target value for the at least one feed variable is determined from a predefined network variable target value for the at least one network variable using the model of the feed network, and the at least one feed variable is set to the determined feed variable target value by of a current converter.

Abstract: A method operates a power grid, which has a DC voltage circuit and an AC voltage circuit, which are electrically connected by a converter. The AC voltage circuit has a supply connection for connecting to a supply network, and an energy store and a generator are connected to the DC voltage circuit. A predicted power of an electrical power provided by the generator is ascertained for a time window, and an energy value that corresponds to the proportion of the predicted power above a power value of the converter is ascertained. A desired state of charge of the energy store that corresponds to a maximum energy that is able to be stored by the energy store minus the energy value is ascertained. The energy store is charged up to a maximum of the desired state of charge if an actual power of the generator is less than the power value.