Steady state torque optimal operating point control for wound rotor synchronous motors

This paper discusses steady state optimal control of the motor from the maximum torque point of view. The motor behavior is researched with a vector control supply in the full speed range. The optimal considerations are compared with a behavior of the classical control structures such as the unity power factor strategy

Project communication management

Tato bakalářská práce se zabývá řízením projektové komunikace v projektu. V první části práce se autor zabývá teoretickou částí projektového managementu a řízení projektové komunikace, která je vypracována podle relativních literárních pramenů. V druhé části byla teorie aplikována na reálnou společnost CIE-Group, jejímž projektem bylo zavedení virtuálního školení do firmy XY. Autor projekt stručně představil a provedl analýzu všech zainteresovaných stran a jejich komunikace. Dále byl vpracován komunikační plán a provedena analýza interní a externí komunikace. Na základě této analýzy jsou připraveny návrhy, které by vedly ke zlepšení projektové komunikaceObhájenoThis bachelor thesis deals with the management of project communication in a project. In the first part of the thesis, the author deals with the theoretical part of project management and project communication management, which is developed according to relative literature sources. In the second part, the theory has been applied to a real company, CIE-Group, whose project was to introduce virtual training to company XY. The author briefly introduced the project and analysed all stakeholders and their communication. Furthermore, a communication plan was developed and an analysis of internal and external communication was carried out. Based on this analysis, suggestions were prepared that would lead to an improvement of the project communication

Single phase current-source active rectifier for traction: control system design and practical problems

This research has been motivated by industrial demand for single phase current-source active rectifier dedicated for reconstruction of older types of dc machine locomotives. This paper presents converters control structure design and simulations. The proposed converter control is based on the mathematical model and due to possible interaction with railway signaling and required low switching frequency employs synchronous PWM. The simulation results are verified by experimental tests performed on designed laboratory prototype of power of 7kVA

Active Elimination of Low-Frequency Harmonics of Traction Current-Source Active Rectifier

In this paper, a new control approach in activesuppression of low-frequency disturbances in the trolleywirecurrent using resonant (R) controllers is presented. Itis dedicated for a single-phase active current-sourcerectifier (ACSR) developed within the research into a newgeneration of main traction converters employing themedium-frequency transformer dedicated for suburbanunits operating on both ac electrification systems of 25kV/50 Hz and 15 kV/16,7 Hz. Proper function of proposedcontrol strategy with a new compensative principle has beenverified by simulations and large experimental study madeon designed small-scale prototype of ACSR of the ratedpower of 7 kVA

Traction Drive with PMSM: Frequency Characteristics Measurement

This paper describes a new method formeasurement of frequency characteristics of ac tractiondrives. It helps to find dangerous resonant frequencies ofthe traction drive supplied from a dc electrification systemand it allows finding danger oscillations of the dc-link LCfilter. The presented method has verified a drive with asurface mounted PMSM controlled by DTC. The resultsprove that the drive amplifies LC filter oscillations underconstant taken power. We have proposed an improvementof the drive control in order to protect the drive against thisphenomenon. The behaviour of the improved DTC has beenanalyzed by experiments made on the laboratory model ofthe traction drive of the rated power of 10 kW

Modulator for 4-level Flying Capacitor Converter with Balancing Control in the Closed Loop

This paper presents a modulator with an active voltage balancing control for the three-phase four-level FLC converter based electric motor drive for applications supplied directly from a 6 kV ac-grid. It describes a modulation algorithm of the FLC converter by using the phase shifted PWM modulation with balancing voltage of the flying capacitor by using P controllers in the closed loop. The proposed control was verified by experiments carried out on the down-scale drive prototype of the rated power of 35 kVA

Fast Real-Time Data Exchange among Distributed Control System of STATCOM Installation

SGS-2021-021Power installations based on power converters in power transmission and power distribution require real-time control which is usually implementing using multiple control units. Therefore, very fast data exchange within constant sampling periods across whole control system is needed. This paper deals with the development and implementation of a specific communication protocol for an embedded modular control system. The communication protocol employs LVDS bus and it is designed for fast data exchange between master and slave control units. The protocol is used in control system REMCS of a STATCOM of 1.35MVA installed in distribution power grid of 22 kV

First Search for Exclusive Diphoton Production at High Mass with Tagged Protons in Proton-Proton Collisions at √s=13 TeV

A search for exclusive two-photon production via photon exchange in proton-proton collisions, pp→pγγp with intact protons, is presented. The data correspond to an integrated luminosity of 9.4 fb−1 collected in 2016 using the CMS and TOTEM detectors at a center-of-mass energy of 13 TeV at the LHC. Events are selected with a diphoton invariant mass above 350 GeV and with both protons intact in the final state, to reduce backgrounds from strong interactions. The events of interest are those where the invariant mass and rapidity calculated from the momentum losses of the forward-moving protons match the mass and rapidity of the central, two-photon system. No events are found that satisfy this condition. Interpreting this result in an effective dimension-8 extension of the standard model, the first limits are set on the two anomalous four-photon coupling parameters. If the other parameter is constrained to its standard model value, the limits at 95% confidence level are |ζ1|<2.9×10−13 GeV−4 and |ζ2|<6.0×10−13 GeV−4

Measurement of single-diffractive dijet production in proton–proton collisions at √ s = 8 TeV with the CMS and TOTEM experiments

Measurements are presented of the single-diffractive dijet cross section and the diffractive cross section as a function of the proton fractional momentum loss ξ and the four-momentum transfer squared t. Both processes p p → p X and p p → X p , i.e. with the proton scattering to either side of the interaction point, are measured, where X includes at least two jets; the results of the two processes are averaged. The analyses are based on data collected simultaneously with the CMS and TOTEM detectors at the LHC in proton–proton collisions at s√=8TeV during a dedicated run with β∗=90m at low instantaneous luminosity and correspond to an integrated luminosity of 37.5nb−1. The single-diffractive dijet cross section σ p X jj, in the kinematic region ξ40GeV, and pseudorapidity |η|<4.4, is 21.7±0.9(stat)+3.0−3.3(syst)±0.9(lumi)nb. The ratio of the single-diffractive to inclusive dijet yields, normalised per unit of ξ, is presented as a function of x, the longitudinal momentum fraction of the proton carried by the struck parton. The ratio in the kinematic region defined above, for x values in the range −2.9≤log10x≤−1.6, is R=(σ p X jj/Δξ)/σjj=0.025±0.001(stat)±0.003(syst), where σ p X jj and σjj are the single-diffractive and inclusive dijet cross sections, respectively. The results are compared with predictions from models of diffractive and nondiffractive interactions. Monte Carlo predictions based on the HERA diffractive parton distribution functions agree well with the data when corrected for the effect of soft rescattering between the spectator partons

Odderon Exchange from Elastic Scattering Differences between pp and p¯p Data at 1.96 TeV and from pp Forward Scattering Measurements

We describe an analysis comparing the p¯p elastic cross section as measured by the D0 Collaboration at a center-of-mass energy of 1.96 TeV to that in pp collisions as measured by the TOTEM Collaboration at 2.76, 7, 8, and 13 TeV using a model-independent approach. The TOTEM cross sections, extrapolated to a center-of-mass energy of √s=1.96 TeV, are compared with the D0 measurement in the region of the diffractive minimum and the second maximum of the pp cross section. The two data sets disagree at the 3.4σ level and thus provide evidence for the t-channel exchange of a colorless, C-odd gluonic compound, also known as the odderon. We combine these results with a TOTEM analysis of the same C-odd exchange based on the total cross section and the ratio of the real to imaginary parts of the forward elastic strong interaction scattering amplitude in pp scattering for which the significance is between 3.4σ and 4.6σ. The combined significance is larger than 5σ and is interpreted as the first observation of the exchange of a colorless, C-odd gluonic compound