Obed Muhayimana
@vut.cz
Researcher UEEN VUT
Brno University of Technology
RESEARCH INTERESTS
Power System and Renewable energy
Scopus Publications
Scopus Publications
Obed Muhayimana, Petr Toman, Vaclav Vycital, and Silas Tuyishime
IEEE
The reliability and stability of a power system is based on its ability and rapidity in tackling its fault conditions. One of the most highly responsive tools used in this regard is the phasor measurement unit (PMU). PMUs provide synchronized data of voltages and currents, availing actual information on the state of the electrical network, granting required system observability, simplifying thus the operation and planning processes. They collect every digitalized data samples and transmit them instantaneously to the controller to compare them with the predefined data of the phasors. As result, appropriate control actions can be taken based on fine-grained data from the network. This study tests the PMU model in Matlab/Simulink and compares its simulation results with the results provided by a PMU block existing in the R2022b Matlab library, for an electrical system during normal operation, symmetrical, and non-symmetrical fault conditions.
Obed Muhayimana, Petr Toman, Vaclav Vycital, and Viktor Jurak
IEEE
Todays power systems are becoming more and more complex due to the continuous increase in energy demand and high proliferation of intermittent renewable resources. Therefore, the system’s control and monitoring became very challenging. The usage of highly responsive phasor measurement units (PMUs) is one of the solutions that are making possible the real-time control and monitoring of electric systems. The available PMU block in the matlab/Simulink library is designed to provide only the magnitude, phase angle, and frequency of the positive-sequence component of a three-phase signal. This is a limitation when there is a need to analyze the real-time situations in all phases considering all symmetrical components in order to get accurate results, especially in case of unsymmetrical systems and more specifically in case of faults with ground current flows. This study develops a phasor measurement unit model in Matlab/Simulink, using Fourier Transforms (FT) and phase-locked loop (PLL) as phasor magnitude, phase angle, and frequency estimation tools, and then compares the results with the real PMU measurements.
Obed Muhayimana and P. Toman
Due to the progressive increase in integrating intermittent distributed generations (DGs), the proliferation of distributed energy resources (DER), and loads with the fast dynamic changes, the planning, monitoring, and operation of distribution networks are becoming a challenge. This is a transitional stage faced by today’s distribution systems from traditional passive networks characterized by unidirectional power flow to active ones with bidirectional power flow and very dynamic characteristics. The application of the recently developed phasor measurement units (PMU) which can provide up to 120 time-tagged measurements per second, can effectively handle the challenges. However, these PMUs need to have appropriate characteristics related to the distribution network vulnerability factors. This work explores and reviews distribution phasor measurement units, their applications, and their optimal placement in active distribution networks. It aims to provide a basic understanding of existing situations and the contribution of PMUs in handling challenges caused by the dynamic aspect of current distribution systems.
Obed Muhayimana and Petr Toman
IEEE
Due to the complexity and increasing challenges faced in today’s power system because of the increasing demand in electrical energy, integration of renewable energies and other distributed energy resources, highly responsive and more reliable tools granting outstanding system observability are required. However, the recent advances in control, sensing, computation, and satellite communication technologies, the use of the global positioning system (GPS) providing users with positioning, navigation, and timing (PNT) services, as well as the development of time-stamped measurement technology (SMT), are enormously contributing in making the real-time system monitoring possible. In addition, the recently developed phasor measurement units (PMU) which can provide 30 to 120 timetagged measurements per second increases the proper system observability. This work explores and reviews the synchrophasor technology and the trend of its applications in power system protection and their contribution in bridging the existing gap in protection, control, and monitoring of the Power system.