scholarly journals Study on the Method for Analyzing Electric Network Resonance Stability

Energies ◽  
2018 ◽  
Vol 11 (3) ◽  
pp. 646 ◽  
Author(s):  
◽  
◽  
◽  
Keyword(s):  
Power Systems ◽  
Systematic Approach ◽  
Zero Point ◽  
Resonance Region ◽  
Oscillatory Behavior ◽  
Linear Network ◽  
Electric Network ◽  
Resonance Modes ◽  
Point Solution ◽  
Power System Oscillations

With the increasing utilization of power electronic equipment in power systems, there has been an increase in the occurrence of oscillatory behavior from unknown sources in recent years. This paper puts forward the concept of electric network resonance stability (ENRS) analysis and tries to classify the above-mentioned oscillations into the category of ENRS. With this method, many complex power system oscillations can be analyzed with the linear network theory, which is mathematically mature. The objective of this paper is to establish a systematic approach to analyze ENRS. By introducing the s-domain nodal admittance matrix (NAM) of the electric network, this paper transforms the judgment of ENRS into the zero-point solution of the determinant of the s-domain NAM. First, the zero-points of the determinant of the s-domain NAM are proved to correspond to the eigenvalues of the system. Then, a systematic approach is proposed to analyze ENRS, which includes the identification of the dominant resonance region and the determination of the key components related to resonance modes. The effectiveness of the proposed approach for analyzing ENRS is illustrated through case studies.

scholarly journals USE OF MATHEMATICAL METHODS FOR OPTIMIZATION OF 110 KV ELECTRIC NETWORK DEVELOPMENT

2020 ◽  
Author(s):  
Maksym Hrebenichenko
Keyword(s):  
Power Systems ◽  
Power Supply ◽  
Capacity Constraints ◽  
Power Lines ◽  
Network Development ◽  
Mathematical Methods ◽  
Electric Networks ◽  
Electric Network ◽  
Supply Capacity

At optimization of development of electric networks of power systems voltage and a configuration of networks are chosen, the order of construction of objects of electric networks is established. The criterion of optimality in optimization is the sum of dynamic consolidated costs for all network elements. The decision must take into account the dynamics of development of power systems networks, requirements for reliability and quality of power supply, capacity constraints on power lines and transformer substations.

scholarly journals New Fast Arctangent Approximation Algorithm for Generic Real-Time Embedded Applications

Sensors ◽  
2019 ◽  
Vol 19 (23) ◽  
pp. 5148
Author(s):  
Mohieddine Benammar ◽  
Abdulrahman Alassi ◽  
Adel Gastli ◽  
Lazhar Ben-Brahim ◽  
Farid Touati
Keyword(s):  
Approximation Algorithm ◽  
Power Systems ◽  
Rational Approximation ◽  
Zero Point ◽  
Approximation Formula ◽  
Practical Implementation ◽  
Approximation Techniques ◽  
Accuracy Requirement ◽  
Practical Evaluation ◽  
Main Approximation

Fast and accurate arctangent approximations are used in several contemporary applications, including embedded systems, signal processing, radar, and power systems. Three main approximation techniques are well-established in the literature, varying in their accuracy and resource utilization levels. Those are the iterative coordinate rotational digital computer (CORDIC), the lookup tables (LUTs)-based, and the rational formulae techniques. This paper presents a novel technique that combines the advantages of both rational formulae and LUT approximation methods. The new algorithm exploits the pseudo-linear region around the tangent function zero point to estimate a reduced input arctangent through a modified rational approximation before referring this estimate to its original value using miniature LUTs. A new 2nd order rational approximation formula is introduced for the first time in this work and benchmarked against existing alternatives as it improves the new algorithm performance. The eZDSP-F28335 platform has been used for practical implementation and results validation of the proposed technique. The contributions of this work are summarized as follows: (1) introducing a new approximation algorithm with high precision and application-based flexibility; (2) introducing a new rational approximation formula that outperforms literature alternatives with the algorithm at higher accuracy requirement; and (3) presenting a practical evaluation index for rational approximations in the literature.

scholarly journals METHODS OF SEARCHING FOR ANOMALIES IN THE DATA PROVIDED BY MODE PARAMETERS MEASUREMENTS OF THE ELECTRIC NETWORK

2021 ◽  
pp. 67-73
Author(s):  
O. Yandulskiy ◽  
O. Bukhanenko
Keyword(s):  
Data Collection ◽  
Power Systems ◽  
Electric Power ◽  
Electric Power Systems ◽  
Electric Network ◽  
Modern Methods ◽  
Analytical Review

The materials of the article are an overview of the problems of development of electric power systems in the context of data collection and processing of mode parameters and analytical review of methods of search and detection of anomalies in data of synchronized vector measurements of mode parameters of electric network. The classification of anomalies, problems that arise during their search, classification of methods of search and detection of anomalies, as well as modern methods of finding anomalies in the data of synchronized vector measurements of power systems are considered.

scholarly journals Development of Floquet Multiplier Estimator to Determine Nonlinear Oscillatory Behavior in Power System Data Measurement

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1824
Author(s):  
Namki Choi ◽  
Hwanhee Cho ◽  
Byongjun Lee
Keyword(s):  
Power Systems ◽  
Power System ◽  
Time Series Data ◽  
Power Transmission ◽  
Orbital Stability ◽  
Oscillatory Behavior ◽  
Series Data ◽  
Floquet Multipliers ◽  
Model Free ◽  
Power Transmission Systems

Measurement-based technology has been developed in the area of power transmission systems with phasor measurement units (PMU). Using high-resolution PMU data, the oscillatory behavior of power systems from general electromagnetic oscillations to sub-synchronous resonances can be observed. Studying oscillations in power systems is important to obtain information about the orbital stability of the system. Floquet multipliers calculation is based on a mathematical model to determine the orbital stability of a system with the existence of stable or unstable periodic solutions. In this paper, we have developed a model-free method to estimate Floquet multipliers using time series data. A comparative study between calculated and estimated Floquet multipliers has been performed to validate the proposed method. The results are provided for a sample three-bus power system network and the system integrated with a doubly fed induction generator.

scholarly journals Water Cycle Algorithm Based Power System Stabilizer Robust Design for Power Systems

2015 ◽  
Vol 66 (2) ◽  
pp. 91-96 ◽  
Author(s):  
Navid Ghaffarzadeh
Keyword(s):  
Power Systems ◽  
Power System ◽  
Water Cycle ◽  
Computation Time ◽  
System Stability ◽  
Power System Stabilizer ◽  
Water Cycle Algorithm ◽  
Optimum Parameters ◽  
System Stabilizer ◽  
Power System Oscillations

Abstract Power System Stabilizers (PSSs) are used to enhance damping of power system oscillations. This paper presents a new fast algorithm to develop PSS. According to this regard, Water Cycle Algorithm (WCA) is used to detect optimum Power System Stabilizer parameters. For this purpose, the design problem of PSS is formulated as an optimization problem and WCA by forming three subsidiary objective functions is employed to search for optimal power system stabilizer’s parameters to minimize the maximum overshoot and settling time together. In order to show the efficiency of the proposed algorithm, a comparison between WCA and without PSS condition has been done, and the results of proposed algorithm show that it detects optimum parameters in reasonable computation time to increase the power system stability.

scholarly journals Comparative Case Study on Oscillatory Behavior in Power Systems of Marine Vessels With High Power Converters

2021 ◽  
Vol 8 ◽  
Author(s):  
Tomasz Tarasiuk ◽  
Piotr Jankowski ◽  
Viknash Shagar ◽  
Andrzej Piłat ◽  
Mariusz Górniak ◽  
...  
Keyword(s):  
Power Systems ◽  
High Power ◽  
Power Converters ◽  
Oscillatory Behavior ◽  
Phase Portraits ◽  
Normal Operation ◽  
Adjustable Speed Drive ◽  
Adjustable Speed ◽  
Marine Vessels ◽  
The Impact

The chief aim of the proposed paper is to compare the behavior of supply voltage registered onboard three vessels equipped with high power converters during normal operation. The vessels considered are a chemical tanker with shaft generator working via power converter, a research-training ship with bow thruster, and a research vessel with dynamic positioning (DP) and electrical propulsion. In the case of the two latter ships, power electronic loads are present, which include a bow thruster adjustable speed drive equipped with the six pulse uncontrolled rectifier and the adjustable speed drive with an active front end (AFE) for propulsion system. For each ship, instantaneous frequency is determined and subsequently fluctuations of fundamental components and chosen harmonics are calculated using zoom-DFT. The characteristics of these irregular fluctuations are compared and commented on. Next, phase portraits and Poincare map of the registered voltages are calculated and compared. Moreover, the impact of ship rolling and pitching on the oscillatory behavior is assessed for the DP ship. The final conclusions identify reasons for oscillatory behavior in electric power systems of marine vessels containing high power converters on the source side and load side. The feasibility of using voltage trajectories as well as Poincare maps for oscillatory behavior detection is assessed.

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