A Modeling Method of Multiphase Synchronous Generator for Shipboards Power System Based on PSCAD/EMTDC

2012 ◽  
Vol 588-589 ◽  
pp. 1300-1303
Author(s):  
Jian Xing ◽  
Luo Jiang Qian ◽  
Si Min Ren
Keyword(s):  
Power System ◽  
Digital Simulation ◽  
Synchronous Generator ◽  
Simulation Software ◽  
Modeling Method ◽  
Synchronous Generators ◽  
Generator Model ◽  
Three Phase ◽  
Transient Solutions ◽  
Difference Expression

The synchronous generators of shipboards power system are generally multiphase (mostly twelve phases), it means necessary to building the model by code programming because there aren’t this ready-made component in EMTDC or other digital simulation software. In this paper, a programming method for numerical calculation of synchronous generator and interfacing program codes to PSCAD/EMTDC are described. According to generic rotate machine Park equation, trapezoid integral is adopted to make the math differential equations discrete to numerical difference expression. The paper emphatically deduces discrete algorithm for getting numerical transient solutions of synchronous generator model. For the sake of the verification for this modeling method, a three-phase synchronous generator model based on code program modeling is taken as test demonstration.

scholarly journals Adaptive Armature Resistance Control of Virtual Synchronous Generators to Improve Power System Transient Stability

Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2365
Author(s):  
Daniel Carletti ◽  
Arthur Eduardo Alves Amorim ◽  
Thiago Silva Amorim ◽  
Domingos Sávio Lyrio Simonetti ◽  
Jussara Farias Fardin ◽  
...  
Keyword(s):  
Adaptive Control ◽  
Power System ◽  
Transient Stability ◽  
Short Circuit ◽  
Stability Margin ◽  
Synchronous Generator ◽  
Synchronous Generators ◽  
Resistance Change ◽  
Clearing Time ◽  
Fault Current Limiters

The growing number of renewable energy plants connected to the power system through static converters have been pushing the development of new strategies to ensure transient stability of these systems. The virtual synchronous generator (VSG) emerged as a way to contribute to the system stabilization by emulating the behavior of traditional synchronous machines in the power converters operation. This paper proposes a modification in the VSG implementation to improve its contribution to the power system transient stability. The proposal is based on the virtualization of the resistive superconducting fault current limiters’ (SFCL) behavior through an adaptive control that performs the VSG armature resistance change in short-circuit situations. A theoretical analysis of the problem is done based on the equal-area criterion, simulation results are obtained using PSCAD, and experimental results are obtained in a Hardware-In-the-Loop (HIL) test bench to corroborate the proposal. Results show an increase in the system transient stability margin, with an increase in the fault critical clearing time (CCT) for all virtual resistance values added by the adaptive control to the VSG operation during the short-circuit.

A Comparative Analysis of Three-Phase, Multi-Phase and Dual Stator Axial Flux Permanent Magnet Synchronous Generator for Vertical Axis Wind Turbine

2013 ◽  
Vol 446-447 ◽  
pp. 709-715 ◽  
Author(s):  
M. Shahrukh Adnan Khan ◽  
Rajprasad K. Rajkumar ◽  
Rajparthiban K. Rajkumar ◽  
C.V. Aravind
Keyword(s):  
Wind Turbine ◽  
Permanent Magnet ◽  
Synchronous Generator ◽  
Vertical Axis ◽  
Vertical Axis Wind Turbine ◽  
Synchronous Generators ◽  
Permanent Magnet Synchronous Generators ◽  
Wind Turbine System ◽  
Three Phase ◽  
Multi Phase

In this paper, the performances of all the three kinds of Axial type Multi-Pole Permanent Magnet Synchronous Generators (PMSG) namely Three-phase, Multi-phase or Five Phase and Double Stator fixed in Vertical Axis Wind Turbine (VAWT) were investigated and compared in order to get an optimal system. MATLAB/Simulink had been used to model and simulate the wind turbine system together with all the three types Permanent Magnet Generators. It was observed from the result that with the increasing number of pole in both low and high wind speed, the five phase generator produced more power than the other two generators. In general, it was observed that the responses of the Multi-phase generator at both high and low speed wind showed promising aspect towards the system followed by Dual Stator. But with the change of the variables such as wind velocity, turbine height, radius, area together with the generator pole pairs and stator resistance, the optimum system should be chosen by considering the trade-off between different configurations which were firmly analyzed and described in this paper.

scholarly journals A novel out of step relaying algorithm based on wavelet transform and a deep learning machine model

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Jigneshkumar Pramodbhai Desai ◽  
Vijay Hiralal Makwana
Keyword(s):  
Deep Learning ◽  
Wavelet Transform ◽  
Power System ◽  
Large Scale ◽  
Half Cycle ◽  
Synchronous Generators ◽  
Power Swing ◽  
Renewable Power ◽  
Three Phase ◽  
Feed Forward Network

AbstractOut-of-step protection of one or a group of synchronous generators is unreliable in a power system which has significant renewable power penetration. In this work, an innovative out-of-step protection algorithm using wavelet transform and deep learning is presented to protect synchronous generators and transmission lines. The specific patterns are generated from both stable and unstable power swing, and three-phase fault using the wavelet transform technique. Data containing 27,008 continuous samples of 48 different features is used to train a two-layer feed-forward network. The proposed algorithm gives an automatic, setting free and highly accurate classification for the three-phase fault, stable power swing, and unstable power swing through pattern recognition within a half cycle. The proposed algorithm uses the Kundur 2-area system and a 29-bus electric network for testing under different swing center locations and levels of renewable power penetration. Hardware-in-the-loop (HIL) tests show the hardware compatibility of the developed out-of-step algorithm. The proposed algorithm is also compared with recently reported algorithms. The comparison and test results on different large-scale systems show that the proposed algorithm is simple, fast, accurate, and HIL tested, and not affected by changes in power system parameters.

scholarly journals A Feasibility Solution of a Synchronous Generator for Optimisation of the System Power Stability using an Integrated Development Environment of Visual Basic-Excel

2020 ◽  
Vol 9 (3) ◽  
pp. 1261-1268
Keyword(s):  
Power Systems ◽  
Power System ◽  
Digital Simulation ◽  
Synchronous Generator ◽  
Power System Stability ◽  
System Stability ◽  
Development Environment ◽  
Runge Kutta ◽  
Mathematical Techniques ◽  
Computational Resources

Power systems are considered highly non-linear because the environment in which they operate keep changing and hence require iterative mathematical techniques to analyse them. Such changes have a resultant effect on the system`s stability. Fluctuations in parameters are experienced in loads across the networks of the system, generator`s outputs, network topology and other operating parameters. Practically, there is no analytical solution exists for solving the problem of stability. On the other hand, there are techniques available to obtain an acceptable approximate solution of such a problem, known as digital simulation. Runge-kutta method is one of these techniques which has been used broadly as it calculates every step in a sequence of sub-steps. The method relies on a complex mathematical modelling of the synchronous generator with the help of Park-Gorev`s transformation, for the sake of simplicity and intuitiveness the method is used to analyse and study the complex equations of the three-phase synchronous generator. Generally, the system is said to be stable if the opposing forces within it are balanced and at a perfect equilibrium. The aims of this research are to establish the effects of synchronous generator`s design and transient conditions upon power system stability with the help of Embedded Microsoft Excel Sheet based on Power System Stability Analysis (EMES-PSS), using the Runge-Kutta integration method. The study has proved that EMES-PSS can find the limits of Salient and Non-Salient machines stability when changing their essential parameters. The optimisation solutions of the power system stability problem can be achieved by using basic computational resources. The software can also be used on a number of modern tablets e.g., Apple`s tablets.

An Electronic Three Phase Turbo-Generator Model Suitable for Use in a Hybrid Configuration with a Minicomputer

1975 ◽  
Vol 12 (4) ◽  
pp. 338-356 ◽  
Author(s):  
S. E. Blanch ◽  
K. Morsztyn ◽  
T. Dillon
Keyword(s):  
Power System ◽  
Test Results ◽  
Variable Parameters ◽  
Generator Model ◽  
Turbo Generator ◽  
Electronic Model ◽  
Three Phase ◽  
Hybrid Configuration

This paper describes an electronic model of a three-phase turbogenerator with widely variable parameters. The model is interphased into the Monash TNA to provide a Power System Simulator suitable for statistical investigations of Power System problems. Test results obtained on the model for the ‘Northfleet System’ are also given.

scholarly journals Transformer EMF in differential equations of synchronous generators

2019 ◽  
Vol 124 ◽  
pp. 05055
Author(s):  
L.N. Tokarev
Keyword(s):  
Differential Equations ◽  
Power System ◽  
Electric Power ◽  
Synchronous Generator ◽  
Electric Power System ◽  
Synchronous Generators ◽  
Accurate Calculation

The article presents differential equations of a synchronous generator transformed according to the theory of two reactions, that is, in the axes d-q. We consider the influence of transformer EMF on transients. We prove that for the accurate calculation of transients in an electric power system it is necessary to use differential equations of the synchronous generator taking into account the transformer EMF in its stator.

scholarly journals The Dynamic of Synchronous Generator under Unbalanced Steady State Operation: A Case of Virtual Generator Laboratory

2015 ◽  
Vol 5 (6) ◽  
pp. 1292
Author(s):  
Sugiarto Kadiman ◽  
Arif Basuki ◽  
Mytha Arena
Keyword(s):  
Steady State ◽  
Synchronous Generator ◽  
Simulation Method ◽  
General Concept ◽  
Virtual Laboratory ◽  
Synchronous Generators ◽  
Steady State Condition ◽  
Generator Model ◽  
Steady State Operation ◽  
Unbalanced Voltage

The purpose of this study is to design and develop a synchronous generator virtual laboratory for undergraduate student courses, which can be treated as an accessorial tool for enhancing instruction. Firstly, the study reviews the general concept and algorithm of synchronous generator model. Secondly, the simulation method of this system is discussed. Finally, the paper introduces its example and analysis. One of the major objectives of this project is the dynamics of synchronous generators connected to the 500 kV EHV Jamali (Jawa-Madura-Bali) System under unbalanced steady state condition that could be modeled as a balanced synchronous generator’s model with unbalanced voltage inputs. The balanced synchronous generator model based on the rotor’s qd0 reference frame was chosen to substitute generator’s model embeded in loadflow analysis. The verification of the proposed generator’s model was checked by comparing it with a PSS Tecquiment NE9070 simulator. The unbalanced voltage inputs of generator were derived utilizing the loadflow analysis by determining the phase and sequence currents, and average bus voltages of the 500 kV EHV Jamali grid considering unbalanced portion variations. Meanwhile, the load locations having significant effect on the test generators are obtained by using the electricity tracing method. The developed virtual laboratory with a given example demonstrated the usefulness of the tool for studying synchronous generator under unbalanced steady-state operation.

scholarly journals Contribution of FACTS Devices to the Transient Stability Improvement of a Power System Integrated with a PMSG-based Wind Turbine

2019 ◽  
Vol 9 (6) ◽  
pp. 4893-4900 ◽  
Author(s):  
N. E. Akpeke ◽  
C. M. Muriithi ◽  
C. Mwaniki
Keyword(s):  
Power System ◽  
Wind Turbine ◽  
Energy Demand ◽  
Wind Farm ◽  
Transient Stability ◽  
Transient State ◽  
Synchronous Generator ◽  
Test System ◽  
Synchronous Generators ◽  
Facts Devices

The increasing penetration of wind energy to the conventional power system due to the rapid growth of energy demand has led to the consideration of different wind turbine generator technologies. In fault conditions, the frequency of the power system decreases and eventually leads to speed differences between the grid and the interconnected wind generator. This can result to power system problems such as transient instability (TS). This paper focuses on enhancing the TS of a permanent magnet synchronous generator (PMSG)-based power system during 3ph fault conditions using FACTS devices. The power system considered is connected to a large wind farm which is based on PMSG. Critical clearing time (CCT) is used as an index to evaluate the transient state of the system. Under the study of an IEEE-14 bus system using PSAT as a simulation tool, the integrated CCT with PMSG-based wind turbine is improved with three independent FACTS devices. One of the synchronous generators in the test system has been replaced at random with the PMSG-based wind turbine which is meant to generate an equivalent power. Time domain simulations (TDSs) were carried out considering four study cases. Simulation results show that the (CCT) of the system with the FACTS devices is longer than the CCT without them, which is an indication of TS improvement.

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