22 results about "Active front end" patented technology

A portable power supply may include an internal power source and a active front-end converter connected to the internal power source. The active front-end converter includes a positive DC connector lead, a negative DC connector lead, a positive source side lead, a negative source side lead, and a plurality of switches. The active front-end converter is configured to operate as a DC-DC converter for DC input signals and an AC-DC inverter for AC input signals. The portable power supply also includes an AC source input, and a DC source input.

Techniques to reduce discontinuities in power, for example, by controlling an electrical power output of an active front end unit during a transition between a first operating mode and a second operating mode. In some examples, to reduce discontinuities, a control unit of the active front end unit can seed the integrator of proportional-integral (PI) controllers that are brought online during the operating mode change with a value that represents the proper state of the current system, such as the measured or calculated value of the component the PI controller is controlling). In other examples, to reduce discontinuities, a control unit of the active front end unit can control reference frame alignment during a transition between a first operating mode and a second operating mode.

A variable speed drive motor system 10 comprises a variable speed drive motor 15, and an active front end (AFE) 14 for driving the variable speed motor, in which the AFE is configured to vary a DC lin

A solid-state transformer system comprises a plurality of isolated DC-DC converter modules, each module having a medium voltage port and a low voltage port. The medium voltage ports are series-connected in each phase of a single-phase or three-phase configuration to form a medium voltage AC interface, and each module comprises two quadrant switches with no active front end. The system includes a controller configured to generate voltage references for each module, the voltage references comprising a DC common-mode component and an AC differential-mode component, and optionally an AC common-mode component, wherein the DC common-mode component ensures unidirectional voltage operation across the medium voltage port of each module. The low voltage ports are interconnected to form a low voltage DC interface. The isolated DC-DC converter modules utilize conversion topologies including frequency modulated resonant converters, phase-shift modulated converters, and hybrid conversion topologies, operating at frequencies between 20 kHz and 100 kHz to achieve soft switching operation over wide operating ranges for improved efficiency and simplified manufacturability.

The application discloses a kind of high-power IGBT rectifying system and method, it is related to the technical field of IGBT rectification, including active front-end rectification main circuit is constructed;Integrated dc side hybrid harmonic modulation auxiliary circuit;Multiple delay signal elimination operation is carried out to the signal obtained by sampling, filter harmonic interference signal, the frequency and phase of grid fundamental voltage are locked by phase-locked loop;Establish the control structure of voltage outer loop and current inner loop, generate the instruction amplitude of net side active current and ideal sine current reference waveform, and real-time control IGBT in active front-end rectification main circuit;Actual input current of net side is analyzed in real time by fast fourier transform, and residual harmonic component is identified;Realize the feedback management of regenerative energy.The application proposes a kind of active front-end IGBT rectification method and system with high adaptability of fusion type, which can operate stably under grid voltage distortion conditions, and realize deep harmonic suppression and high efficient energy bidirectional flow.

The present invention pertains to a power electronic converter, such as an inverter or converter, for an electric application such as a motor drive, electrolyzer or charger. The power electronic converter includes a DC link and an active front end (AFE) connected to grid via a filter and a grid board with a first inrush relay with a resistive device. The resistive device may be a resistor, more specifically an NTC resistor or a PTC thermistor. The grid board further includes a second inrush relay, wherein at least one of the inrush relays is controlled to engage or disengage during startup phase of the power electronic converter and during abnormal grid voltage conditions, such that the DC link is charged via the resistive device or by bypassing the resistive device, and such that the AFE is provided for boosting the DC link voltage to a save level and under controlled conditions. The invention also pertains to an electric motor drive according and a method for operating a power electronic converter.

A system for dissipating energy stored in a battery system includes a direct current (DC)-DC converter, an active front end (AFE), and a controller including one or more memories and one or more processors. The one or more processors are configured to determine a current state of charge (SOC) of the battery system; retrieve, from the one or more memories, the minimum energy value to be maintained in the battery system; compare the current SOC of the battery system with the minimum energy value; and dissipate the energy stored in the battery system if the current SOC is greater than the minimum energy value through the DC-DC converter, the AFE, both of the DC-DC converter and the AFE, and / or both of a first semiconductor device of the DC-DC converter and a second semiconductor device of the AFE.

Electronic devices and methods for controlling them. A method for controlling an electronic device comprising an AC input interface, an AC output interface, a DC bus, a battery interface, a bidirectional AC / DC active front-end (AFE) driver circuit, a bidirectional DC / DC converter, and an electronic processor, comprises determining a difference between a power level available from the AC input interface and a power demand at the AC output interface, and, if the power demand at the AC output interface is greater than or equal to the available power level, (i) controlling an output switch between the AFE driver circuit and the AC output interface to a closed state, and (ii) controlling the AFE driver circuit and the bidirectional DC / DC converter.to provide additional AC output power at the AC output interface using stored energy from a battery electrically connected to the battery interface.

The application provides a single-phase power electronic transformer and a control method, and belongs to the technical field of power electronic transformers.The single-phase power electronic transformer comprises a plurality of power modules, which are cascaded at a high-voltage alternating-current port and are connected in parallel at a low-voltage direct-current port; each power module comprises two solid-state switches, a high-voltage positive H-bridge unit, a high-voltage negative H-bridge unit, two high-frequency transformers and a low-voltage H-bridge unit; the two solid-state switches are connected in parallel with the high-voltage positive H-bridge unit and the high-voltage negative H-bridge unit, respectively; the alternating-current sides of the high-voltage positive H-bridge unit and the high-voltage negative H-bridge unit are connected to the high-voltage side windings of the two high-frequency transformers, respectively; the low-voltage side windings of the two high-frequency transformers are connected at different names; and the same name ends of the two high-frequency transformers are connected to the low-voltage H-bridge unit.The single-phase power electronic transformer provided by the application does not need an active front-end H-bridge unit, reduces the number of power conversion stages and has high operation efficiency.

The invention relates to a power electronic converter, such as an inverter or converter, for electrical applications, such as motor drives, electrolyzers or chargers. The power electronic converter includes a DC link and an active front end (AFE) connected to a grid via a filter and a grid plate. The grid plate has a first surge relay. The first surge relay has a resistive device. The resistive device may be a resistor, more specifically an NTC resistor or a PTC thermistor. The power grid plate further comprises a second surge relay. During a start-up phase of the power electronic converter and during abnormal grid voltage conditions, the at least one surge relay is controlled to turn on or off such that the DC link is charged via or bypassing the resistive device, and the AFE is used to boost the voltage of the DC link to a safety level and in a controlled condition. The invention also relates to an electric motor drive and to a method for operating a power electronic converter.

Techniques to reduce discontinuities in power, for example, by controlling an electrical power output of an active front end unit during a transition between a first operating mode and a second operating mode. In some examples, to reduce discontinuities, a control unit of the active front end unit can seed the integrator of proportional-integral (PI) controllers that are brought online during the operating mode change with a value that represents the proper state of the current system, such as the measured or calculated value of the component the PI controller is controlling). In other examples, to reduce discontinuities, a control unit of the active front end unit can control reference frame alignment during a transition between a first operating mode and a second operating mode.

A system (104) for dissipating energy stored in a battery system (102) includes a direct current (DC)-DC converter (104), an active front end (AFE) (108), and a controller (112) including one or more memories (114) and one or more processors (116). The one or more processors (116) are configured to determine a current state of charge (SOC) of the battery system (102); retrieve, from the one or more memories (114), the minimum energy value to be maintained in the battery system (102); compare the current SOC of the battery system (102) with the minimum energy value; and dissipate the energy stored in the battery system (102) if the current SOC is greater than the minimum energy value through the DC-DC converter (104), the AFE (108), both of the DC-DC converter (104) and the AFE (108), and / or both of a first semiconductor device (106) of the DC-DC converter (104) and a second semiconductor device (110) of the AFE (108).

The application discloses an active front-end rectifier and a prediction control method thereof, and the method comprises the following steps: according to a voltage model of a three-level active front-end rectifier, calculating active power and reactive power of a power grid according to instantaneous power theory; according to the voltage model, combining the active power and the reactive power, calculating a power gradient; converting the power gradient into a second-order state space equation, predicting the control input of the active front-end rectifier by using a super-helix observer, and obtaining the input voltage of the active front-end rectifier according to the predicted control input and the grid-side voltage; based on the input voltage, obtaining an optimal voltage vector by using a limited set model prediction control framework, and controlling the active front-end rectifier based on the switching state corresponding to the optimal voltage vector. The method combines power gradient modeling, super-helix observer disturbance compensation and limited set prediction control, so that the rectifier overcomes the influence of parameter mismatch, and realizes high-sinusoidal current, stable DC voltage and power tracking control.

This invention discloses a method for transient control of module voltage in a wideband and wide-voltage device. The wideband and wide-voltage device of this invention includes an input transformer, a converter valve, and an output transformer. The converter valve adopts a three-phase independent configuration, with each phase consisting of multiple cascaded dual H-bridge modules. Each dual H-bridge module includes an active front-end H-bridge and an inverter H-bridge. The control methods for the active front-end H-bridge and the inverter H-bridge are improved and optimized: the active front-end H-bridge employs a constant DC voltage control strategy to achieve real-time balance of the module's DC side voltage; the inverter H-bridge employs a carrier phase-shift modulation strategy. By simultaneously controlling the active front-end H-bridge and the inverter H-bridge, this invention promotes the rapid dissipation of voltage accumulation within the module, effectively suppresses voltage rise, and rapidly suppresses voltage fluctuations under transient conditions, preventing overvoltage damage and ensuring the safe and stable operation of the module under transient conditions.

Electronic devices and methods of controlling the same. One method of controlling an electronic device including an AC input interface, an AC output interface, a DC bus, a battery interface, a bidirectional AC / DC active front end (AFE) drive circuit, a bidirectional DC / DC converter, and an electronic processor includes determining a difference between a power level available from the AC input interface and a power demand at the AC output interface, and, in response to the power demand at the AC output interface being greater than or equal to the available power level, (i) controlling an output switch between the AFE drive circuit and the AC output interface to a closed state and (ii) controlling the AFE drive circuit and the bidirectional DC / DC converter to provide supplemental AC output power at the AC output interface using stored energy from a battery electrically connected to the battery interface.

A regenerative drive system includes a plurality of power cells receiving power from a source and supplying power to one or more output phases, wherein each power cell is operable in multiple operation modes, each power cell including multiple switching devices including active front-end switching devices, and a central control system controlling operation of the plurality of power cells, wherein the central control system is configured to control the active front-end switching devices of each power cell with variable conduction angles in the multiple operation modes.

Various examples are provided for high voltage isolation. The isolation can be provided for discrete non-isolated devices using an electrically isolating substrate that is thermally conductive. In one example, a module includes a plurality of switching devices connected in series; one or more rubber buffer disposed between switching device pairs of the plurality of switching devices; and thermal interfaces disposed between switching devices of the switching device pairs and cooling surfaces of the module, the thermal interfaces electrically isolating the switching devices from the cooling surface. In another example, an extreme fast charger (EFC) station includes an active front end (AFE) module that includes at least one module, where the module is a half-bridge power module. The EFC station can include a dual-active-bridge (DAB) high voltage (HV) module that includes at least one module, where the module is a half-bridge power module.

An electronic device and a control method thereof. A method of controlling an electronic device including an AC input interface, an AC output interface, a DC bus, a battery interface, a bi-directional AC / DC active front end (AFE) driver circuit, a bi-directional DC / DC converter, and an electronic processor includes determining a difference between a power level available from the AC input interface and a power demand at the AC output interface, and in response to the power demand at the AC output interface being greater than or equal to the available power level, (i) controlling an output switch between the AFE drive circuit and the AC output interface to a closed state, and (ii) controlling the AFE drive circuit and the bi-directional DC / DC converter to provide supplemental AC output power at the AC output interface using stored energy from a battery electrically connected to the battery interface.

An apparatus for extracting energy from an oscillating working fluid comprises a flow passage for the working fluid, an energy conversion unit and a flow control device, the energy conversion unit and the flow control device being in fluid communication with the flow passage. The flow control device is operable between a first configuration in which the flow control device is open to allow a flow of the working fluid to exit therethrough, and a second configuration in which the flow control device is arranged to restrict a flow of the working fluid therethrough, such that the working fluid enters the flow passage via the energy conversion unit. Rotation of a gas turbine in response to the flow of the working fluid generates rotational torque, which actuates an energy generation apparatus to generate electrical energy. The energy generation apparatus rotational speed is controlled by an active front end drive.

A method for loss-reducing operation of a system (1) in which an Active Front-End AFE (2) supplies a DC bus (3) by power exchange with a connected AC network (7), wherein at least one load (5) is connected to the DC bus (3) via at least one DC / DC converter (4), comprises the following steps: - Acquiring an initial DC voltage value as the operating point of the DC bus (3), a power dissipation value of the AFE (2) and a power dissipation value of the DC / DC converter (4) at a first time point, - Changing the voltage of the DC bus (3) to a second DC voltage value in one direction of change at a second time point in time, - Recording a power dissipation value of the AFE (2) and a power dissipation value of the DC / DC converter (4) at the second time point, and - Maintain the operating point and reverse the direction of change if the sum of the power losses of the AFE (2) and the DC / DC converter (4) at the first time is less than the sum of the power losses of the AFE (2) and the DC / DC converter (4) at the second time, and otherwise set the second DC voltage value as the operating point and maintain the direction of change. A system (1) set up to carry out the procedure is also disclosed.

The present invention relates to an electronic power converter, such as an inverter or converter, for an electrical application, such as a motor control device, an electrolysis device, or a charging device. The electronic power converter comprises a DC link and an active front end (AFE) which is connected to a power supply via a filter and a mains board with a first inrush current relay and a resistor device. The resistor device can be a resistor, in particular an NTC resistor or a PTC thermistor.The power supply board further comprises a second inrush current relay, wherein at least one of the inrush current relays is controlled to couple or disconnect during a commissioning phase of the electronic power converter and during anomalous mains voltage conditions, such that the DC link is charged via the resistor device or bypassing the resistor device, and such that the AFE is made available to raise the DC link voltage to a safe level and under controlled conditions. The invention also relates to an electric motor control device and a method for operating an electronic power converter.

The present disclosure provides a power generation device for a direct current propulsion ship, based on DC power, and a method of controlling the same, and a power generation device for a direct current propulsion ship according to an embodiment of the present disclosure includes a synchronous generator generating an AC voltage, an active front end (AFE) converter connected to an output terminal of the synchronous generator and converting the AC voltage into a DC voltage, and an automatic voltage regulator (AVR) controlling a field current to maintain flux of a stator of the synchronous generator constant, and a sensor measuring a rotation speed of the synchronous generator may be omitted.