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A low voltage ride-through solution for an indirect three-level matrix converter based open-end winding drive is demonstrated. The proposed method uses the input filter capacitors to exchange the inertial energy from the motor and thereby maintain the flux in the motor during grid fault conditions. The input filter capacitors act as the voltage source for inverters during the fault. Ride-through is...
The utility-scale renewables, PV and wind, are already approaching grid parity. To further enhance their penetration rapidly requires additional cost reduction and increased efficiency. There are other applications in utility-scale energy storage systems and in substations with power ratings in MW range for rapid charging of multiple electric vehicles. Towards this goal, one approach to interface...
This paper considers the development of a practical, low cost bearingless motor system for use in large industrial applications. Bearingless motor technology is proposed as an ultra efficient, highly integrated solution in fluid handling systems which currently use high speed (over 7 kRPM) centrifugal blowers/pumps. Over 40 potential industrial users have been interviewed to identify their needs and...
Modular multilevel converters (MMC) have become an attractive solution for high voltage direct current (HVDC) transmission applications due to its scalability, reliability and easy maintenance. Considerable work has been around the conventional 2-level half-bridge submodule. Use of multilevel submodules can result in smaller overall footprint, reduced components and lower losses. This paper presents...
At high voltage and power levels in utility-scale applications, transformers are needed to step-down grid voltages for integrating renewables and motors. A novel single-stage solid state transformer (SST) interface using modular multilevel converter (MMC) is proposed to interface a low voltage machine with a high voltage DC grid. Due to its modular structure, the high voltage side is easily scalable...
This paper describes the work in progress for education in Electric Power, Control and Energy Systems (EPCES) at undergraduate and graduate levels, initially commencing in high schools. Further, the paper describes a methodology to build a robust pipeline of high school students who go on to choose electric power/control/energy as a field of study as undergraduates. This paper describes the graduate...
A power electronic transformer (PET) with a cycloconverter on the grid side is being proposed in this paper for integrating several renewable energy sources to the grid. A single 1-phase multi-winding high frequency transformer connects multiple wind energy conversion systems and solar photovoltaic arrays to the cycloconverters using separate H-bridge PWM converters. The current is smooth and continuous...
Voltage source inverters (VSIs) are used in electric drives to generate a variable frequency, variable amplitude voltage for motor control. In addition to the desired three-phase output voltage, VSIs also generate high-frequency common-mode voltage that causes shaft voltage and stray currents; that in turn cause EMI and motor failure. VSIs also need a stable DC voltage input that is generated from...
This paper presents an active compensation device for common-mode (CM) voltage elimination in 3-phase space-vector pulse-width-modulated (SVPWM) inverters. The proposed device consists of a single-phase 2-level inverter (H-bridge) which supplies a compensating voltage to the inverter via a step-up common-mode transformer tied to all three phases at the output. The H-bridge active filter is supplied...
A winding design approach is proposed to create a single motor winding which is able to produce both radial force and torque. This approach can be used to design new bearingless motors as well as to transform conventional motor designs into bearingless motors by simply modifying the winding end-connections. The resulting winding has two sets of terminal connections: one for torque and one for suspension...
This paper discusses a modified indirect space vector pulse-width modulation (ISVPWM) technique for common mode voltage (CMV) reduction in a matrix converter (MC). The ISVPWM technique offers immense flexibility in making an intelligent choice of space vectors to not only achieve the objective of variable speed operation of the drive but also target other advanced features like reduced CMV and improved...
A systematic method of designing a zero-ripple Ćuk converter for PV/Battery-to-grid applications is presented in this paper. The integrated magnetic core design uses an intuitive flux-reluctance model to arrive at the Area Product for this kind of structure. Unlike the earlier designs for this converter, it provides a completely analytical approach to design this converter for a range of specifications...
An open end drive configuration utilizing a transformer isolated single phase high frequency ac link is presented. A high frequency ac link enables the use of a compact and light weight transformer to provide voltage transformation and galvanic isolation while the open end configuration leads to an improved utilization of the ac link. The desired output is synthesized using dual cycloconverters modulated...
Common-mode voltage (CMV) generated by semiconductor switching causes stray currents and mechanical failure in modern drive systems. Solutions employed to attenuate or isolate the common-mode voltage (CMV) require additional components, and may still fail to eliminate the detrimental effects. Matrix converter based open-end winding drives, when modulated using synchronous vectors, do not generate...
MOSFETs built using wide band gap (WBG) materials offer numerous benefits to power electronic circuits. These benefits are quite apparent in applications requiring breakdown voltages ≥ 600V, where Silicon IGBTs are typically used due to their combination of high breakdown voltage and low conduction losses. Compared to Silicon IGBTs, WBG MOSFETs offer very short turn-ON and turn-OFF times, which reduce...
Open-end winding matrix converter drives provide a higher voltage transfer ratio and better output voltage quality with more voltage levels in the output voltage, compared to single matrix converter drives. Pulse Width Modulation (PWM) techniques have been developed for open-end winding drives to suppress switching common-mode voltage at load terminals. The switching of bi-directional switches in...
Over the past years, modular multilevel converters (MMC) have been widely researched as a preferred option among voltage source converters for HVDC transmission system. The converter presents modularity to generate high number of output voltage levels by simple series connection of modules, resulting in higher reliability and easy failure management/maintenance. Synthesis of near sinusoidal output...
This paper discusses a modified space vector technique applied to an indirect matrix converter (IMC) which results in the reduction of common mode voltages and other advanced features. The conventional indirect space vector pulse-width modulation (SVPWM) method of controlling matrix converters involves the usage of two adjacent active vectors and one zero vector for both rectifying and inverting stages...
This paper presents a novel “Modular Multilevel Converter” (MMC) topology. The topology takes advantage of the MMC characteristics by offering multilevel output voltage with low Total Harmonic Distortion (THD), increased reliability, and design flexibility due to the modular nature of the converter [1] and [2]. This topology is composed of a “full-bridge converter” (FBC) connected to multiple “High...
Practical implementations of the power electronics required to operate bearingless machines with so-called “dual purpose no voltage” (DPNV) windings are proposed. These windings enable a bearingless machine to use the same coils to produce both radial suspension forces and torque, which has been shown in the literature to enable better machine performance. In this paper, the use of two-level inverters...
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