8 results about "Active front end" patented technology

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.

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.

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.

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.