Abstract:
A hybrid active power link device includes a plurality of active power link modules (APLMs). Each APLM of the plurality of APLMs includes a plurality of switching devices including a first switching device and a second switching device coupled in series. Each APLM of the plurality of APLMs also includes at least one first-type energy storage device (ESD) coupled in parallel with both of the first switching device and the second switching device. The hybrid active power link device also includes at least one second-type ESD coupled in series with at least one APLM of the plurality of APLMs.
Abstract:
A voltage converter may include a first set of silicon (Si)-based power devices coupled to a first direct current (DC) voltage source and a second set of Si-based power devices coupled to a second DC voltage source. The voltage converter may also include a first set of silicon-carbide (SiC)-based power devices coupled to the first set of Si-based power devices and to the second set of Si-based power devices. Each SiC-based power device of the first set of SiC-based power devices may switch at a higher frequency as compared to each Si-based power device of the first and second sets of the Si-based power electronic devices.
Abstract:
A fraction rated conversion system for coupling a plurality of high voltage direct current (HVDC) power strings in parallel to an HVDC transmission system includes at least one fraction rated power converter coupled to the plurality of HVDC power strings and at least one capacitive device coupled to the at least one fraction rated power converter. The at least one fraction rated power converter and the at least one capacitive device regulate a differential voltage across each HVDC power string of the plurality of HVDC power strings to be substantially similar to each other.
Abstract:
A power conversion system is presented. The system includes a power source coupled to a power converter and a controller. The controller is configured to determine a value of at least one parameter corresponding to the power source. Additionally, the controller is configured to provide a first portion of the at least one parameter to the power converter and modify an operating frequency of the power converter, duty ratio of the power converter, or a combination thereof. Furthermore, the controller is configured to obtain an electrical quantity at an output of the power converter based on the modified operating frequency, the modified duty ratio, or a combination thereof. Also, the controller is configured to deliver a combination of the electrical quantity obtained at the output of the power converter and a second portion of the at least one parameter to a load. Method for converting power is also presented.
Abstract:
A monolithically integrated semiconductor assembly is presented. The semiconductor assembly includes a substrate including silicon carbide (SiC), and gallium nitride (GaN) semiconductor device is fabricated on the substrate. The semiconductor assembly further includes at least one transient voltage suppressor (TVS) structure fabricated in or on the substrate, wherein the TVS structure is in electrical contact with the GaN semiconductor device. The TVS structure is configured to operate in a punch-through mode, an avalanche mode, or combinations thereof, when an applied voltage across the GaN semiconductor device is greater than a threshold voltage. Methods of making a monolithically integrated semiconductor assembly are also presented.
Abstract:
A medium voltage direct current (MVDC) collector system for renewable power generation facilities includes at least one renewable energy generation device. The MVDC collector system also includes at least one direct current (DC)-to-DC (DC/DC) power converter coupled to the at least one renewable energy generation device. The at least one DC/DC power converter is configured to shift a switching operation of the DC/DC power converter between full-wave conversion and half-wave conversion. The MVDC collector system further includes at least one controller coupled to the at least one DC/DC power converter. The at least one controller is configured to regulate shifting the switching operation of the at least one DC/DC power converter between full-wave conversion and half-wave conversion.
Abstract:
A method implemented using at least one of the processor includes disposing a power source on a vehicle, wherein the power source is configured to power auxiliary loads of the aircraft. The method also includes connecting a power source disposed on a vehicle configured to engage an aircraft for ground operation, to auxiliary loads of the aircraft via an on-board power system. The method also includes performing energy management of the aircraft during the period of ground operation. The method further includes disconnecting the power source when an alternate electrical power is available to the on-board power system.
Abstract:
A monolithically integrated semiconductor assembly is presented. The semiconductor assembly includes a substrate including silicon (Si), and gallium nitride (GaN) semiconductor device is fabricated on the substrate. The semiconductor assembly further includes at least one transient voltage suppressor (TVS) structure fabricated in or on the substrate, wherein the TVS structure is in electrical contact with the GaN semiconductor device. The TVS structure is configured to operate in a punch-through mode, an avalanche mode, or combinations thereof, when an applied voltage across the GaN semiconductor device is greater than a threshold voltage. Methods of making a monolithically integrated semiconductor assembly are also presented.
Abstract:
A high-voltage direct-current (HVDC) transmission system includes an alternating current (AC) electrical source and a power converter channel that includes an AC-DC converter electrically coupled to the electrical source and a DC-AC inverter electrically coupled to the AC-DC converter. The AC-DC converter and the DC-AC inverter each include a plurality of legs that includes at least one switching device. The power converter channel further includes a commutating circuit communicatively coupled to one or more switching devices. The commutating circuit is configured to “switch on” one of the switching devices during a first portion of a cycle of the H-bridge switching circuits and “switch off” the switching device during a second portion of the cycle of the first and second H-bridge switching circuits.
Abstract:
A system for integrating energy storage into a modular power converter includes at least one energy storage unit coupled to a first converter for converting a first direct current (DC) voltage of the at least one energy storage unit into a first high frequency alternating current (AC) voltage. At least three phase legs of the modular power converter generate three phase AC voltages. Each phase leg includes a plurality of switching modules connected in series. The switching modules have a plurality of fully controllable semiconductor switches, an energy storage device, and a second converter coupled to the respective energy storage device for converting a second DC voltage of the energy storage device into a second high frequency AC voltage. In the system, three similarly positioned switching modules of the three phase legs form one power unit. Further, a high frequency transformer is provided which has at least one primary winding connected to the first converter and at least three secondary windings, each connected to the second converter of each of the three similarly positioned switching modules. A controller is configured to regulate at least one electrical parameter of the modular power converter.