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Variable-frequency drive

About: Variable-frequency drive is a research topic. Over the lifetime, 837 publications have been published within this topic receiving 5691 citations. The topic is also known as: VFD.


Papers
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Patent
20 May 2015
TL;DR: In this article, a variable frequency drive is used for controlling a powered component of the refrigeration system, which includes drive circuitry configured to provide variable frequency power via an output interface, a first interface configured to receive power from the photovoltaic source, a second interface configurable to receive AC power from an alternating current (AC) source, and a DC bus coupled to the drive circuitry and configured to transmit power to the driver circuitry.
Abstract: A refrigeration system is powered primarily by a photovoltaic source and by an alternating current (AC) source as a backup. A variable frequency drive is used for controlling a powered component of the refrigeration system. The variable frequency drive includes drive circuitry configured to provide variable frequency power via an output interface, a first interface configured to receive power from the photovoltaic source, a second interface configured to receive AC power from the AC source, a DC bus coupled to the drive circuitry and configured to transmit power to the drive circuitry. The drive circuitry receives power from the first interface when the power from the photovoltaic source is adequate to power the drive circuitry and receives power from the second interface when the power from the photovoltaic source is not adequate to power the drive circuitry.

2 citations

Journal Article
TL;DR: Because the middle DC segment volts of the inverter is fluc- tuated, the integrated direct power control strategy with power feedback is proposed to improve the dynamic response speed and anti-jamming ability.
Abstract: The direct power control strategy of PWM rectifier and the variable frequency drive system of the inverter are studied.Then the op- eration principle and the nmning characteristic of dual-PWM converter are analyzed.Because the middle DC segment volts of the inverter is fluc- tuated,the integrated direct power control strategy with power feedback is proposed to improve the dynamic response speed and anti-jamming ability.The simulation result verify the suggested scheme.

2 citations

Proceedings ArticleDOI
04 Mar 2018
TL;DR: In this paper, a dual-active-bridge (DAB) isolated three phase power factor correction (PFC) rectifier is adapted to medium voltage (MV) variable frequency drive (VFD) applications.
Abstract: Dual-active-bridge (DAB) isolated three phase power factor correction (PFC) rectifier is attracting more and more attentions from academia and industry because of high power density, operational flexibility and premium performance, etc. This paper gives an overview to adapt the DAB PFC rectifier to medium voltage (MV) variable frequency drive (VFD) applications. First, a novel medium voltage drive (MVD) topology and its operating conditions are illustrated. Second, as the core component used in the DAB rectifier, a hypothetic silicon carbide (SiC) metal oxide semiconductor field effect transistor (MOSFET) module rated at 12.5 kV, 375 A is proposed. The electrical, namely power loss, and thermal models are developed. Third, the control scheme of the grid-tied DAB rectifier is investigated. Analysis and simulations have been carried out to verify the proposal.

2 citations

Journal ArticleDOI
TL;DR: In this paper, a hybrid-electric turbocharger, variable-frequency drive (VFD), and novel sensorless control algorithm were developed, which can lead to better overall vehicle performance, emissions, and efficiency while allowing for further engine downsizing and increased power density.
Abstract: Electrically assisted engine boosting systems lend themselves to better throttle response, wider effective operating ranges, and can provide the ability to extract excess energy during deceleration and high-load events (and store it in a vehicle's onboard batteries). This can lead to better overall vehicle performance, emissions, and efficiency while allowing for further engine downsizing and increased power density. In this research effort, a hybrid-electric turbocharger, variable-frequency drive (VFD), and novel sensorless control algorithm were developed. An 11 kW permanent-magnet (PM) machine was coupled to a commercial turbocharger via an in-line, bolt-on housing attached to the compressor inlet. A high-efficiency, high-temperature VFD, consisting of custom control and power electronics, was also developed. The VFD uses SiC MOSFETS to achieve high-switching frequency and can be cooled using an existing engine coolant loop operating at up to 105 °C at an efficiency greater than 98%. A digital sliding mode-observer sensorless speed control algorithm was created to command and regulate speed and achieved ramp rates of over 68,000 rpm/s. A two-machine benchtop motor/generator test stand was constructed for initial testing and tuning of the VFD and sensorless control algorithm. A gas blow-down test stand was constructed to test the mechanical operation of the hybrid-electric turbocharger and speed control using the VFD. In addition, a liquid-pump cart was assembled for high-temperature testing of the VFD. Initial on-engine testing is planned for later this year. This paper intends to present a design overview of the in-line, hybrid-electric device, VFD, and performance characterization of the electronics and sensorless control algorithm.

2 citations

Proceedings ArticleDOI
02 Aug 2015
TL;DR: In this article, a scaled down drive train high speed shaft test rig has been developed to evaluate the structural integrity of wind turbine drive train during a lifetime of 20 years by modeling and experiments with focus on system torsional and flexural vibrations and transient events.
Abstract: Modern wind turbines are enormous large-scale electro-mechanical systems. They operate in complex conditions, determined by a turbulent wind field, by possible disturbances in the electricity grid and by the behavior of sea waves for offshore turbines. Guaranteeing the structural integrity of these machines during a lifetime of 20 years is an enormous challenge. In this paper the dynamics of a wind turbine drive train high speed subsystem is studied both by modeling and experiments with focus on system torsional and flexural vibrations and transient events which can reduce fatigue life of functional components (gearbox, bearings, shafts, couplings, others). A scaled down drive train high speed shaft test rig has been developed. Main components of the test rig are six-pole motor with variable frequency drive controller (up to 1000 rpm), shafts' disk coupling and flexible mounting structure representing gearbox housing with output high speed bearing. The test rig is equipped with measurement system comprising a set of accelerometers and displacement sensors, data acquisition hardware and software (SKF WindCon3.0). Mathematical and computational models of the test rig have been developed and went through validation tests. The system kinematic and dynamic responses are studied for different operational scenarios and structural parameters (ratio of shaft bending stiffness and stiffness of mounting structures, unevenly inertia load distribution, others). The ultimate goal of the test rig is to get insight into interaction between internal dynamics of drive train functional components to be used the results obtained in developing novel methods to detect, predict and prevent faults and failures in wind turbine drive trains arising due to misalignments and transient external loads.

2 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20239
202220
202143
202084
201956
201887