Abstract: A vehicle includes a battery, an electric machine, an electrical outlet, and a controller. The electric machine is configured to charge the battery. The electrical outlet is configured to draw power from the battery to power an external device. The controller is programmed to adjust a rate at which the electric machine charges the battery based on a power consumption at the electrical outlet exceeding a threshold and a battery degradation value.

Abstract: Embodiments of this application disclose a control method for a photovoltaic power generation system and a photovoltaic power generation system, to reduce a photovoltaic energy loss. The method includes: presetting, by the photovoltaic power generation system, an upper limit value for each converter in the photovoltaic power generation system, where the upper limit value is a maximum voltage value of an output voltage to ground of the converter, and the output voltage to ground is a voltage difference between a positive output end of the converter and a ground point of the photovoltaic power generation system; and limiting, by the photovoltaic power generation system, an output voltage to ground of a target converter based on an upper limit value corresponding to the target converter, where the target converter may be any converter in the photovoltaic power generation system.

Abstract: A method for feeding electric power into an electrical supply grid by means of a local feed unit. The feed unit is connected to a grid link point connected to a transformer point directly or via a supply connection. The transformer point is connected to a grid section via a transformer. The method includes feeding electrical real power into the electrical supply grid at the grid link point, feeding electrical reactive power into the electrical supply grid at the grid link point, detecting a change to be made in the real power to be fed in, and changing the fed-in real power in accordance with the detected change to be made. The method includes limiting a change in the fed-in reactive power over time when changing the fed-in real power and/or immediately thereafter or temporarily activating voltage control on the basis of the change in the fed-in real power.

Abstract: The disclosed wireless transmitter estimates a client location in space and transmits power in the form of electromagnetic (EM) waves to that location. In response to receiving the power, a client sends a power request signal. In some implementations, the power request signal includes a request that the wireless transmitter transmit more power to the client. In response to the power request signal, the wireless transmitter can modify the power transmitted to the client to increase/decrease the amount of power the client is receiving. For example, the wireless transmitter can modify the emitted EM waves to increase coherent addition or decrease coherent addition at the location of the client to increase the amount of power the client receives. In some implementations, the wireless transmitter modifies the phase distribution of EM waves to increase the amount of power a client receives.

Abstract: A power system includes an integrated energy storage system (ESS). It further includes a photovoltaic (PV) source. It further includes an integrated inverter having power connections to both the energy storage system and the photovoltaic source. The inverter includes an integrated PV disconnect switch.

Abstract: A system for controlling a high-voltage relay of an eco-friendly vehicle includes a high-voltage battery, a plurality of driving devices driven with power supplied from the high-voltage battery, a relay unit including the high-voltage relay and a relay coil, the high-voltage relay being driven based on an amount of current flowing through the relay coil to interconnect the high-voltage battery and the driving devices, a load determiner for determining whether a conduction current load of the high-voltage relay is high or low, and a controller for changing the amount of current flowing through the relay coil based on a result of the determination of the load determiner.

Abstract: Disclosed is an electrical unit with a first port configured to be operatively connected to an AC-grid, a second port configured to be operatively connected to an AC-load, and a third port to be operatively connected to an AC-side of a first inverter. The electrical unit includes a first choke arranged between the third port and the second port. The electrical unit is configured to transfer electrical power provided by the first inverter from the third port via the first choke to the second port. The electrical unit is configured to provide grid-forming electrical power to the second port in case of disconnection from the AC-grid at the first port. Further disclosed is a backup power system and a method for operating a backup power system.

Abstract: An electrical power converter unit (2) includes: a first connection interface (10) comprising two leads (12, 14) forming a DC input/output interface for connecting a first electrical device to the power converter unit, a three-phase rectifier power converter circuit (16) and a second connection interface (30) for connecting a second electrical device to the power converter unit. The second connection interface includes a switching unit (46) adapted to switch between:—a DC input/output mode, in which first, second and third arms of the power converter circuit (16) are electrically connected together, forming one DC input/output; and—an AC input/output mode, in which the arms are disconnected from each other, forming separate input/outputs for a three-phase AC voltage.

Abstract: An automatic power transfer switch system includes a dimmable lighting load adapted to operate under a variable amount of power in dependence on a dimming control signal, an automatic transfer switch configured to connect a primary electrical power source to the dimmable lighting load under normal operating conditions of the primary electrical power source in a first mode, and to automatically disconnect the primary electrical power source from the load and connect an emergency electrical power source to the load under malfunctioning operating conditions of the primary electrical power source in a second mode, the automatic transfer switch further including an integrated load reduction dimmer configured to provide a dimming control signal to the dimmable lighting load.

Abstract: A power transmitter includes: a first switch coupled between a first node and a reference voltage node; a second switch configured to be coupled between a power supply and the first node; a coil and a capacitor coupled in series between the first node and the reference voltage node; a first sample-and-hold (S&H) circuit having an input coupled to the first node; and a timing control circuit configured to generate a first control signal, a second control signal, and a third control signal that have a same frequency, where the first control signal is configured to turn ON and OFF the first switch alternately, the second control signal is configured to turn ON and OFF the second switch alternately, and where the third control signal determines a sampling time of the first S&H circuit and has a first pre-determined delay from a first edge of the first control signal.

Abstract: An elevator includes an elevator motor; a motor drive for the elevator motor having a frequency converter comprising a rectifier bridge, an inverter bridge and a DC link in between, which frequency converter is controlled via a controller, the rectifier bridge being connected to AC mains via three feed lines comprising chokes, and the rectifier bridge being realised via controllable semiconductor switches; a contactor being located between the feed lines and AC mains; a backup power supply at least for emergency drive operation; and an emergency control for performing an automatic emergency drive. The backup power supply is via a first switch connectable with only a first of said feed lines.

Abstract: A DC/DC converter system includes a current sensor sensing a current flowing from a photovoltaic panel to a power converter device, and a DC/DC converter provided between a battery facility and the power converter device and configured to convert first DC power output from the battery facility into second DC power. The DC/DC converter includes a first operation mode in which the second DC power is generated to allow an output current and an output voltage to simulate the photovoltaic-cell current-voltage characteristics according to a current value sensed with the current sensor. The DC/DC converter may also include a second operation mode executing a boost operation of increasing a potential at a connection node, and a third operation mode in which a voltage at the connection node is converted to charge the battery facility. The DC/DC converter can selectively switch among the first, second, and third operation modes.

Abstract: Flywheel based electrical energy management system and device. The device will often comprise at least one shaft mounted flywheel, each flywheel comprising a flywheel mass that contains a plurality of permanent magnets. The flywheel spins within at least one stator comprising a plurality of magnetic pickup coils configured so that the flywheel mass can rotate freely within the stator. The flywheel may be placed in a vacuum chamber and be supported by magnetic bearings. The flywheel shaft(s) are typically connected to one or more axial mounted motor generators, and the system further typically comprises a storage battery and control processor. The system handles a variety of different and not always stable input power sources, and converts this to continuous, efficient and stable electrical power. The system can handle a variety of clients, such as buildings, electric vehicles, and the like, and can operate under a variety of challenging conditions.

Abstract: A vehicle that has electronic systems including an autonomous vehicle stack includes a dual output power system for powering the electronic systems of the vehicle. The power system includes a battery at a first voltage level for storing energy at the first voltage level, a dual output belt-driven starter generator that is started by a starter receiving power from the battery at the first voltage level and that provides dual outputs at a second voltage level for providing power to the electronics systems, at least one DC-DC converter that converts the dual outputs at the second voltage level to dual outputs at the first voltage level, and first and second power distributors that distribute power from the battery and DC-DC converter(s) to the electronic systems. The power systems may be configured to power safety critical components from respective power distributors and DC-DC converters at the respective voltage levels.

Abstract: A power conversion system includes: a power converter connected between a DC power source and an AC power source; an AC switch connected between the power converter and the AC power source; an AC capacitor connected on the power converter side relative to the AC switch, on an output side of the power converter; and a control device configured to, in a state in which the AC switch is open, recognize a voltage of the AC capacitor and control the power converter to bring an output voltage of the power converter close to a voltage of the AC power source from the voltage of the AC capacitor gradually or in a step-by-step manner, and then close the AC switch. The power conversion system can suppress overcurrent at a time of start-up of a power converter and inrush current at a time of interconnection to an AC power source.

Abstract: The present disclosure provides systems and methods for improved bifacial solar modeling. A method may comprise measuring an albedo of a surface on which an array of bifacial solar modules is disposed and setting an albedo parameter of a bifacial gain model. The method may further comprise measuring a backside irradiance of the array and setting a backside irradiance parameter. The method may further comprise setting a shed transparency parameter using the measured backside irradiance and a geometric model of the array. The method may further comprise setting a rear shading parameter using a shading model of the array. The method may further comprise computing an expected bifacial gain of the array. The method may further comprise determining an actual bifacial gain of the array. The method may further comprise setting a rear mismatch parameter to minimize a loss function of the expected bifacial gain and the actual bifacial gain.

Abstract: The present specification relates to an uninterruptible power supply device, an uninterruptible power supply system and a method for controlling the uninterruptible power supply system, and relates to a power supply device comprising a circuit breaker for switching connection to a power bus, thereby controlling the reception and supply of the power by opening and closing the circuit breaker according to various situations occurring in a system, a power supply system and a method for controlling the power supply system.

Abstract: A device and method based on an active anti-islanding technique for Distributed Power Generator Systems. The present invention is based on the Sandia Voltage Shift (SVS) technique, which includes a small Non-Detection Zone (NDZ) and by an acceptable solution to the tradeoff between the output power quality and the effectiveness of islanding detection. The present invention has the advantage to improve the NDZ and to reduce the anti-islanding detection times. This is due to the exponential-product modification made in the positive feedback to inject current, thereby making the response faster than SVS. Additionally, a self-adaptive gain is considered to achieve a low Total Harmonic Distortion (THD) at different power levels.

Abstract: A power supply system with UPS, PCS and circuit diagnosis capabilities is disclosed, including: a DC-bus connected to a voltage/current (V/I) meter, a battery energy storage system (ESS) container, a power conditioning system (PCS), at least one current translation unit, and an energy management controller (EMC), wherein, the V/I meter is used to monitor the voltage and current of the DC-bus, and the PCS performs bi-directional conversion between the DC current from the DC-bus and the AC power from an external distribution panel, the current translation unit translate the DC current from the DC-bus into a voltage suitable for at least a critical load, and the EMC controls the operation of the V/I meter, the battery ESS container, the PCS, and the at least one current translation unit, respectively.

Abstract: A master controller controls a plurality of uninterruptible power supply apparatuses each including a slave controller and detection circuits that detect at least a DC input voltage, an AC output voltage, and an output current of an inverter. The master controller generates a first voltage command value and a second voltage command value common to the plurality of uninterruptible power supply apparatuses based on detection values from the detection circuits transmitted from the slave controller of each of the uninterruptible power supply apparatuses. The master controller transmits the generated first and second voltage command values to the slave controller of each of the uninterruptible power supply apparatuses. The slave controller generates a first control signal for controlling a converter in accordance with the received first voltage command value. The slave controller generates a second control signal for controlling the inverter in accordance with the received second voltage command value.