Studying the power quality (PQ) is an essential issue to ensure the safe and accurate operation of sensitive equipment particularly for nuclear installations. Assessment of PQ involves collecting and analysing data resources and then... more
Studying the power quality (PQ) is an essential issue to ensure the safe and accurate operation of sensitive equipment particularly for nuclear installations. Assessment of PQ involves collecting and analysing data resources and then evaluating it with reference to PQ standards. There are many alternatives for PQ and it is difficult to make an appropriate selection among them in the existence of their multiple criteria which are usually conflicted. So this selection subject can be classified as a Multi Criteria Decision Making (MCDM) problem. To do so, a reliable and scientific method for studying and evaluating the overall system PQ is required. This study aims to assess performance of PQ for the electrical power system at a Nuclear Research Reactor (NRR) during a certain period using multiple measures for the most decisive PQ phenomena. It focuses on a number of the most important PQ phenomena namely frequency fluctuation (deviation), unbalances of current and voltage, current and...
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A new approach is introduced to facilitate the dealing with power components. The authors have been inspired this approach from the concept of effective or root mean square (RMS) value. This term has been defined for convenience in... more
A new approach is introduced to facilitate the dealing with power components. The authors have been inspired this approach from the concept of effective or root mean square (RMS) value. This term has been defined for convenience in representing a periodic waveform successfully. By this new approach we can analytically introduce formulas that determine precisely proper instantaneous power components.
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Power quality monitoring and investigation are necessary to maintain perfect and safe operation of sensitive equipment especially for nuclear facilities. In this work, a case study about harmonic analysis of an electrical power system at... more
Power quality monitoring and investigation are necessary to maintain perfect and safe operation of sensitive equipment especially for nuclear facilities. In this work, a case study about harmonic analysis of an electrical power system at a Nuclear Research Reactor (NRR) has been done to evaluate the current state from the PQ point of view. Firstly, a study is given separately for different types of individual loads in NRR and their impact on the PQ of the electrical system. Then, an investigation of practical measurements was carried out for the NRR electrical system during certain condition of operation. These measurements were concerned with harmonic distortion in voltage, current and power of the electrical system of the NRR facility. Generally, the measurement results showed that the harmonic distortions in the electrical system are within the standard limits. Finally, modeling and simulation for the NRR electrical system has been built using Electrical Transient Analysis Progra...
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This paper introduces an analytical derivation to evaluate the flow of electric energy in power networks. This derivation is based on the paper “New Notions Suggested to power theory development - part 1: analytical derivation” published... more
This paper introduces an analytical derivation to evaluate the flow of electric energy in power networks. This derivation is based on the paper “New Notions Suggested to power theory development - part 1: analytical derivation” published in IEEE/PES general meeting 2008. It is proven that the true energy that totally transfers to (or from) the system is the energy which belongs to the average true power only i.e. active power produced from voltage and current of the same harmonic order. All other kinds of energy are fluctuating sinusoidaly and the net transferred energy belongs to these sinusoidal power components is nil. It is a theoretical attempt to prove that the new definitions of power components suggested in paper mentioned above are connected with their associated energies and to find the physical essence of the power components under sinusoidal and non-sinusoidal conditions.
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Article history: Received: 3rd July 2020 Accepted: 15th July 2020 A process for establishing an Integrated Management System (IMS) for operation and maintenance of the ETRR-2 reactor is initiated. Development and application of the IMS... more
Article history: Received: 3rd July 2020 Accepted: 15th July 2020 A process for establishing an Integrated Management System (IMS) for operation and maintenance of the ETRR-2 reactor is initiated. Development and application of the IMS consider the usage of a graded approach in order to commensurate the resources devoted to the management system with the importance of an item/activity and the magnitude of the risks. Literatures have introduced different methods for the concept of graded approach which is very important in applying the management, safety and technical requirements. This paper provides an additional example for the methodology of applying such approach. It suggests a grading methodology and determines the considerations that need to be taken into account in grading the application of IMS requirements. The paper introduces a proposal for classification of items or activities in the ETRR-2 into four grades. Then it gives a grading example of specific controls for mainte...
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Electrical system of nuclear facility should have suitable safety mechanisms and minimum losses for providing reliability of power supply to guarantee the continuity of operation. The purpose of having electrical infrastructure with high... more
Electrical system of nuclear facility should have suitable safety mechanisms and minimum losses for providing reliability of power supply to guarantee the continuity of operation. The purpose of having electrical infrastructure with high efficiency is to have energy delivery systems with high efficiency. So in this research, a proposed model of the nuclear reactor electrical system will be presented to study the effect of connecting new energy saving loads and advanced controllers on the system performance in order to keep safe and good performance of this nuclear facility. By using Electrical Transient Analysis Program (ETAP) software the NRR simulation model was developed. The analysis was performed with using nonlinear energy saving lighting systems and Variable Frequency Drive (VFD) installed as a controlled for secondary pump of the reactor by providing smooth motor starting also its advantage for energy saving. From the results, active power consumed and current were reduced, ...
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Nuclear and renewables energies are the two variants for low-carbon energy and the evolving grid suggests possible synergies between them. Nuclear energy introduces supple operations based on power demand, while renewables such as PV and... more
Nuclear and renewables energies are the two variants for low-carbon energy and the evolving grid suggests possible synergies between them. Nuclear energy introduces supple operations based on power demand, while renewables such as PV and wind hybrid systems depend on the presence and strength of sunlight or wind. For grid stability, there is need to improve their performance in order to overcome the impact of this disadvantage. The paper is a step in this direction as it addresses a detailed comprehensive dynamic modeling and an efficient control of grid-connected energy sources such as PV or wind system to increase system reliability and to ensure the power quality and safe operation of critical demands. The behavior of the suggested hybrid system is tested at different climate circumstances such as variation of sun radiation and wind speed. The PV is equipped with a boost converter and a three-phase pulse width modulation (PWM) inverter. The wind energy comprises a doubly fed gene...
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A new approach is introduced to facilitate the dealing with power theory. The authors have been inspired this approach from the concept of "instantaneous power". This term has been defined... more
A new approach is introduced to facilitate the dealing with power theory. The authors have been inspired this approach from the concept of "instantaneous power". This term has been defined for convenience in representing the energy content of a system, since it satisfies the law of "conservation of energy". By this new approach we have analytically introduced formulas that determine
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Interline Power Flow Controller (IPFC) is one of the latest flexible AC transmission systems (FACTS) devices. It is reliable with double line systems and with loads fed from more than one source. IPFC principle of operation and its... more
Interline Power Flow Controller (IPFC) is one of the latest flexible AC transmission systems (FACTS) devices. It is reliable with double line systems and with loads fed from more than one source. IPFC principle of operation and its mathematical model which is termed as power injection model (PIM) incorporated in Newton-Raphson (NR) power flow algorithm are presented in this paper. A software program is developed using MATLAB package in order to simulate the presented model. Simulation studies are carried out on a standard IEEE 5-bus system. The impact of changing IPFC parameters based on numerical results of the proposed model is then discussed.