OMAR, H. Využití měření synchronních fázorů v elektrických sítích [online]. Brno: Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií. 2025.
The main goal of the diploma thesis was to understand the theory of synchronous phasor measurement and literature review on the use of phasor measurement units. Furthermore, to understand the basics of state estimation theory and the application of phasor measurement units for state estimation. The student completed the partial tasks and it can be stated that all parts were submitted in an acceptable form and content. -Page 16-17, section 2.3.1 – last three paragraphs were repeated from content point of view from section 2.3 (page 15). -Page 20, last sentence is incomplete. -Reference [8] is not cited in the text. The assignment was completed. The student worked independently, presented and consulted on partial results. The range of literature used is sufficient, sources are almost properly cited. The formal and graphic level of the work is good. I recommend the thesis for defense.
The thesis dealt with the use of phasor measurement units (PMUs) in electrical power systems. The author focussed on the basical concept of the PMUs, their applications in the power system's real-time control and monitoring as well as their contribution in the systems' state estimation. The IEEE 39-bus test system was considered as a case study and an optimal placement of PMUs was handled. In section 1, the author introduces the study explaining the study problematic and motivations as well as some historical background of PMUs. But in sub-section 1.3 where the author discusses the role of the current synchrophasor measurements in the grids, the relationship or the link between the listed elements and the rest of the paragraph is not clear. In sub-section 1.5, the author mentioned: '' Here are the key roles and purposes of the voltage measurements in the grid'' but no role and no purpose is provided! In sub-section 2.3 three successive paragraphs were copied and pasted in the sub-section 2.3.1. Even though the paragraphs are similar, they have the reference [1] in 2.3 and reference [3] in 2.3.1 which is questionable. In section 2, the study discussed the phasor measurement unit and their applications but for PMU application sub-section, the author just listed different applications with no explanation about them. The details on different PMU applications were necessary since it is one of the recommended points to cover according to the given instructions. Fortunately, some of the applications were discussed in the rest the work and if it were not the case, this point could be considered as uncovered. In sub-section 3.2, the last sentence on page 20 looks incomplete. The references are appropriate, enough and well-presented but it is not seen where the reference [8] was cited in the text. In the sub-section 2.3.1 there are many paragraphs without references while it is obvious that the expressed ideas are from other literatures. The rest of the work is well done, the state estimation is quite well done, the case study is well exploited and the considered PMU optimal placement is well done. The obtained simulation results are good as well. I evaluate the work with grade C (70 points) and recommend it for defence. Questions for defence: 1. Why is the measurement synchronizing aspect of PMUs crucial for the power system monitoring and control? 2. Is there any disadvantages in using PMUs in electrical power systems? 3. Explain how the use of PMUs in electrical power networks can impact the integration of distributed energy resources.
eVSKP id 168069