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Evaluation and Comparison of Power Quality Changes from Multiple Measured Points
Koštialik, Marek ; Kopička, Marek (referee) ; Paar, Martin (advisor)
This diploma thesis deal with the description of electrical energy quality in low voltage. A test data model is created in the thesis which can automatically evaluate the state of the quality of electric energy in terms of higher harmonic voltages in the MATLAB programming environment. To verify the correct design of the model, two possible views of simulated data are created in the form of tables and graphical dependencies. An user interface is created for more complex control of each model states of the data being considered.
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Reconfiguration of an industrial distribution system including local power source integration
Benetka, Tomáš ; Holoubek, Jiří (referee) ; Drápela, Jiří (advisor)
This bachelor´s thesis deals with reconfiguration of industrial network that has been technologically reconstructed. The aim of this study is mostly to describe changes made on devices used for reactive power compensation and improving the power quality. Thesis is divided into two parts. Theoretical part of thesis deals with parameters used for judging power quality and causes of changes for these parameters, eventually with devices for its adjustment. Standard demands for these parameters are also included. Further, reactive power compensation, extract of reactive power appliance and their influence on power network is described in this thesis. In the second - practical - part devices used for reactive power compensation were reconstructed. This part is also focused on local energy source integration and usage of power electronic engineering products for power quality provision.
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Load model
Lašo, Matej ; Ptáček, Michal (referee) ; Kopička, Marek (advisor)
This thesis deals with power quality and load modeling. The issues of power quality, principles of load model creation and various types of loads and their principles are described and explained in this thesis. Various software and its main adventages in power systems modeling are described and various load models and simulations in PSCAD program are created and described at last.
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Distributed Generation and its Influence on Power Quality
Bernáth, František ; Santarius, Pavel (referee) ; Braciník,, Peter (referee) ; Mastný, Petr (advisor)
This work deals with the deployment of distributed power sources into the electric power grid. The nature of these sources causes that the massive integration may experience problems with power quality in the local context, and also overall reliability of supply in the range of interconnected power systems may be endangered. Work is focused on local voltage quality problems with special emphasis on analysis and design of tools (e.g. reactive power compensation units of power plants or dynamic voltage control by transformers 110/22kV) for voltage control in power distribution systems. These tools should be used as a part of uniform concept of voltage control. The proposed concept is involved.
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The Appliances Immunity to Short Voltage Dips and Interruptions
Bok, Jaromír ; Beláň, Anton (referee) ; Santarius, Pavel (referee) ; Drápela, Jiří (advisor)
This Ph.D. thesis deals with problems about voltage dips and short voltage interruptions, generally named as voltage events, which origin in power supply networks and have a negative influence for all connected electric appliances. In this thesis single phase appliances are considered. These problems closely relate with area of electromagnetic compatibility which solve all questions about correct operation of different types of electric appliances during electromagnetic disturbances impact. Voltage events are ones of the many types of electromagnetic disturbances. The connection between disturbance sources and sensitive electric appliances is created by power supply lines. The immunity of electric appliances to voltage dips and short interruptions is currently tested via voltage dips with strictly defined parameters which are intended by class of electromagnetic environment in which the usage of electric appliance is recommended. During immunity tests the rectangular shape of voltage dips is preferred. The main descriptive parameters of testing voltage events are the residual voltage and the event time duration. But voltage dips and short interruptions defined by this way do not closely relate with parameters of real voltage dips and interruptions occurred in public supply system where parameters of voltage dips are variable. Moreover in the power supply system there are many of others voltage parameters which can have a significant influence to immunity level of connected electric appliances. This Ph.D. thesis also deals with finding more voltage event parameters. Although the voltage events occurrence in the power supply system is not limited and voltage events are considered only as informative voltage parameter it is important to monitor voltage events occurrence. The monitoring device has to be able to operate for ling time period and it has to detect parameters of voltage events with adequate accuracy. The accuracy of detected event parameters and the detection delay depends on the detection algorithm characteristics. That is why the part of this thesis relates with a comparison of several detection algorithms and their abilities to correct detection of voltage event parameters. The main purpose of this thesis is the proposal of connection between classification of voltage dips and short interruptions occurred in power supply system with the classification of electric appliances immunity to these voltage events. On the base of many of provided electric appliances immunity tests and also on the base of long time period voltage events monitoring the special compatibility levels are proposed in this thesis. The observation of proposed compatibility levels will bring the increasing level of reliable operation of all connected electric appliances.
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Influence of Wind Farms on Electrical Energy Quality
Bartko, Jan ; Krátký,, Milan (referee) ; Malý, Jiří (advisor)
This thesis is occupied by influences of wind farms on electrical energy quality. Object of thesis was analyse influence of these power plants in a large of number. The first part was attended to presentation of wind turbines producers and their agency on worldwide and European market. At the same time were introduced new technologies of wind power generate. The second part is occupied by influence of wind farms on electrical energy quality. In this part was created model of feed system by GLF software and wind farms were connected into it. By the help of this model was run analyze of local influences of wind power plants on electrical energy quality. In last part was assessed influence of wind power plants feed system integration on electrical energy price, build and operating costs, including the prognosis to the future.
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Design of reactive power compensation in distribution network
Popek, Jiří ; Holoubek, Jiří (referee) ; Lázničková, Ilona (advisor)
This thesis is about reactive power compensation in industrial network. Task is design reactive power compensation devices, so that the power factor, which is main indicator of power quality, was within the limits required by the distributor. This is applied to wholesale customers of electrical energy. Reactive power consumed by appliances increased the current that flows through the network, transmission losses and voltage drop. Reactive power compensation is a measure reducing load current and ohmic losses in a supply line. Given that the compensation is one of the significant cost-saving measures in electric power distribution. Distributor requires electric power consumption with a lagging power factor in the range from 0,95 to 1. Other values of power factor are penalized.
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Power quality measuring system
Valenta, Jaroslav ; Mrákava, Petr (referee) ; Mlýnek, Petr (advisor)
This thesis deals with the measurement of power quality. The evaluating quality parameters, data collection systems and transfer technologies will be discussed. The various type of cryptographic algorithms are also described. Cryptographic algorithms, which ensure to secure data communications from remote collection points of measurement, will be realized. These cryptographic algorithms will be realized in MATLAB and C/C++. The last part is focus on designed and implemented a simulation model to telemetry the power quality.
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The effect of disperzed generation on power quality
Kružík, Martin ; Orságová, Jaroslava (referee) ; Drápela, Jiří (advisor)
This MASTER`S THESIS engages in connecting with dispersed generation into electrical network and their influence on power quality. This thesis sets out to make up simple dynamic model of Wind power station and model of simple network. At this model I would like to simulate influence its working on voltage’s characteristics in addition place. Besides this is necessary calculate voltage’s characteristics according present methods – factory energy rules [PNE]. And these results compare with results of simulation
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