scholarly journals Voltage stabilization of a controlled autonomous magnetoelectric generator with a magnetic shunt and permanent magnet excitation

2021 ◽  
Vol 6 (5 (114)) ◽  
Author(s):  
Vadim Chumack ◽  
Volodymyr Bazenov ◽  
Oksana Tymoshchuk ◽  
Mykhailo Kovalenko ◽  
Serhii Tsyvinskyi ◽  
...  
Keyword(s):  
Power Plants ◽  
Permanent Magnets ◽  
Quantitative Difference ◽  
Synchronous Generator ◽  
Synchronous Generators ◽  
External Characteristic ◽  
Generator Voltage ◽  
The Stability ◽  
Main Magnetic Flux ◽  
Magnetic Shunt

The paper presents the results of testing and research of the characteristics of a controlled autonomous magnetoelectric synchronous generator with a magnetic shunt. Structurally, the studied generator is a modified asynchronous machine in which the rotor is made with permanent magnets and an additional system in the form of a magnetic shunt. By adjusting the winding current of the magnetic shunt, the output voltage of the generator is regulated. The following characteristics were investigated: the no-load characteristic during operation with permanent magnets and when the winding current of the magnetic shunt changes with forward and reverse polarity. Also, the external characteristic for active and active-inductive loads; the control characteristic when the load current changes at a constant generator voltage. Analysis of the obtained characteristics makes it possible to determine the limits of regulation of the external characteristic, which is ≈40 % relative to the main magnetic flux. The obtained regulation depth allows maintaining the stability of the external characteristic for power factors not exceeding 0.9, which is the usual passport value for autonomous power plants based on synchronous generators. Comparison of the data of research conducted on the experimental setup shows sufficient convergence for engineering and practical tasks. The maximum quantitative difference is 9.3 %, which suggests the adequacy of the previously developed mathematical model. The control characteristic, constructed experimentally at constant generator voltage, is the control law of the magnetic shunt winding for the studied generator. The investigated version of a synchronous generator with a magnetic shunt should be used for autonomous power plants, renewable energy systems, and autonomous power supply systems.

scholarly journals Overview of Methods for Determining Parameters of Synchronous Generators

2020 ◽  
Vol 20 (4) ◽  
pp. 103-113
Keyword(s):  
Power Systems ◽  
Computational Models ◽  
Meta Analysis ◽  
Measurement Data ◽  
Synchronous Generator ◽  
Adaptive Model ◽  
Operational Control ◽  
Synchronous Generators ◽  
Computing Power ◽  
The Stability

A synchronous generator is one of the key elements of any power system, having a significant impact on the stability and reliability of consumers’ power supply. Nowadays, the power systems emergency and operational control issues are being solved using computational models, the parameters whereof are determined using the reference data, or the data obtained during testing. High dependence of the models’ parameters on various external factors leads to a significant decrease in the accuracy of solving the issues of emergency and operational control. Identification based on the traditional telemetry systems or synchrophasor measurements is used to improve the accuracy of parameters of the power systems’ computational models. The purpose of this research lies in a meta-analysis of the available studies aimed at developing a methodology for determining parameters of a synchronous generator on the basis of measurement data. Russian and foreign studies were analyzed and grouped to achieve this goal. After that, for each group, advantages, disadvantages, and the area of application were identified. As a result, it is shown that the existing methods for determining parameters of synchronous generators based on measurement data cannot adapt to the source dataset and also require significant computing power. As a way to overcome these shortcomings, an adaptive model of a synchronous machine is proposed.

scholarly journals Droop-free controls of inverter-based generator for use in systems that interconnected with synchronous generators

2021 ◽  
Vol 12 (2) ◽  
pp. 765
Author(s):  
Suchart Janjornmanit ◽  
Sakorn Panta ◽  
Wirat Nakkrongdee
Keyword(s):  
Synchronous Generator ◽  
Active Power ◽  
Control Technique ◽  
Voltage Source ◽  
Frequency Change ◽  
Droop Control ◽  
Synchronous Generators ◽  
Voltage Source Inverters ◽  
Autonomous Operation ◽  
The Stability

Because of its simplicity and autonomous operation, droop control technique is widely implemented for power generation control in microgrids. Despite its popularity, it has been reported that the technique has the stability problem. In this paper, the previous work of droop-free inverter-based generator designed for operating in a fix frequency islanded microgrid, is redesigned to have the ability to operate in both islanded and grid connected microgrid as well as to the main power grid where it interconnected with synchronous generators. The proposed voltage source inverters use phase locked loop(PLL) algorithm to synchronize the changing frequency due to the operation of the synchronous generator. Unlike the frequency droop control that the output frequency is varied as its active power changed, the proposed controls do not make an adjustment of the system frequency. This kind of operation reduces the chance of the system unstable due to severe frequency change and it also reduces the frequency deviation when it increases its active power output. Simulation and result of the meshed power network demonstrate the feasibility to implement the proposed controls in thereal system.

scholarly journals Modelling and Control of a Hydropower Plant in Dealing with the Speed Control Problem of Synchronous Generators

2020 ◽  
pp. 258-264
Author(s):  
Thi-Mai-Phuong Dao
Keyword(s):  
Rotational Speed ◽  
Synchronous Generator ◽  
Speed Control ◽  
System Stability ◽  
Hydropower Plant ◽  
Synchronous Generators ◽  
Output Frequency ◽  
Electric Power Grid ◽  
The Stability ◽  
And Control

Maintaining the rotational speed of synchronous generators in a hydropower plant is a vital control strategy in power system stability and operation. It is because such rotational speed is proportional to the output frequency of the synchronous generator, thereby it strongly affects the stability of the electric power grid. This paper presents a study regarding the modelling and control of a hydropower plant to maintain the generator speed. This study is divided into two main parts. A well-used model of an isolated hydropower plant is established in this study at first; then two controllers including conventional PI and intelligent fuzzy logic regulators are investigated to speed control of the generator. Simulations implemented in MATLAB/Simulink package demonstrate effectiveness and feasibility of the proposed speed controllers.

scholarly journals Performance Assessment of Some Practical Loss of Excitation Detection Schemes Employing a Realistic Model

Energies ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5928
Author(s):  
Abbas Hasani ◽  
Claus Leth Bak ◽  
Filipe Miguel Faria da Silva
Keyword(s):  
Power Plants ◽  
Synchronous Generator ◽  
Realistic Model ◽  
Industrial Applications ◽  
Domain Model ◽  
Detection Methods ◽  
Synchronous Generators ◽  
Ieee Standard ◽  
Real Time Digital Simulator ◽  
Detection Schemes

Loss of excitation (LOE) relay is one of the most essential protection elements for synchronous generators in power plants. During the last few decades, several LOE detection methods have been proposed, while limited schemes such as admittance- and impedance-based ones have been adopted for industrial applications. This study investigates and compares the behavior of some practical LOE detection schemes through extensive simulation scenarios, and from the reliability, speed, and security points of view. The simulation scenarios are accomplished by using the real-time-digital-simulator, where the phase domain model of the synchronous generator is used to develop a realistic and typical power generation system. Employing such a system, different types of complete and partial LOE incidents can be applied according to IEEE Standard C37.102-2006, while the performance of any scheme can be assessed through accurate and realistic LOE scenarios.

The Excitation Controller for A Synchronous Generator Based on Nonlinear Optimal Control

2011 ◽  
Vol 383-390 ◽  
pp. 5542-5547
Author(s):  
Jin Ling Yang ◽  
Ru Cheng Han
Keyword(s):  
Differential Geometry ◽  
Optimal Control ◽  
Synchronous Generator ◽  
Optimal Controller ◽  
Excitation Control ◽  
Synchronous Generators ◽  
Single Machine Infinite Bus ◽  
The Stability ◽  
Linear Controllers ◽  
Better Than

A nonlinear optimal controller for excitation control of synchronous generators is presented. Based on differential geometry theory, the controller is designed by transforming the nonlinear system to an equivalent linear system. The analysis and simulation of a single-machine infinite-bus power system indicate that the stability of the proposed controller better than the stability of conventional linear controllers

scholarly journals Synchronous Generator Model Parameter Estimation Based on Noisy Dynamic Waveforms

2016 ◽  
Vol 67 (1) ◽  
pp. 21-28
Author(s):  
Sebastian Berhausen ◽  
Stefan Paszek
Keyword(s):  
Parameter Estimation ◽  
Power Systems ◽  
Power System ◽  
Objective Function ◽  
Estimation Method ◽  
Synchronous Generator ◽  
Voltage Regulation ◽  
Operating Conditions ◽  
Synchronous Generators ◽  
Generator Voltage

Abstract In recent years, there have occurred system failures in many power systems all over the world. They have resulted in a lack of power supply to a large number of recipients. To minimize the risk of occurrence of power failures, it is necessary to perform multivariate investigations, including simulations, of power system operating conditions. To conduct reliable simulations, the current base of parameters of the models of generating units, containing the models of synchronous generators, is necessary. In the paper, there is presented a method for parameter estimation of a synchronous generator nonlinear model based on the analysis of selected transient waveforms caused by introducing a disturbance (in the form of a pseudorandom signal) in the generator voltage regulation channel. The parameter estimation was performed by minimizing the objective function defined as a mean square error for deviations between the measurement waveforms and the waveforms calculated based on the generator mathematical model. A hybrid algorithm was used for the minimization of the objective function. In the paper, there is described a filter system used for filtering the noisy measurement waveforms. The calculation results of the model of a 44 kW synchronous generator installed on a laboratory stand of the Institute of Electrical Engineering and Computer Science of the Silesian University of Technology are also given. The presented estimation method can be successfully applied to parameter estimation of different models of high-power synchronous generators operating in a power system.

scholarly journals The synchronous generator based on a hybrid excitation with the extended range of voltage adjustment

2019 ◽  
Vol 84 ◽  
pp. 02009 ◽  
Author(s):  
Andrzej Popenda ◽  
Sławomir Chwalba
Keyword(s):  
Theoretical Analysis ◽  
Experimental Test ◽  
Permanent Magnets ◽  
Magnetic Circuit ◽  
Synchronous Generator ◽  
Equivalent Circuits ◽  
Field Coil ◽  
Hybrid Excitation ◽  
Extended Range ◽  
Generator Voltage

In the paper a synchronous generator based on a hybrid excitation, including permanent magnets and field coil, is studied. The structures of rotor magnetic circuit allowing one to expand the range of generator voltage adjustment are explained and compared with the standard hybrid rotor. The structures are described mathematically and their equivalent circuits are given. The results of theoretical analysis and experimental test are presented.

Electromagnetic Induced Force Study in the Magnetoelectric Generator Winding

2015 ◽  
Vol 792 ◽  
pp. 3-7
Author(s):  
Aleksandr Tatevosyan ◽  
Andrey Tatevosyan ◽  
Valeriya Fokina
Keyword(s):  
Decision Making ◽  
Permanent Magnets ◽  
Frequency Converter ◽  
Induction Machine ◽  
Synchronous Generator ◽  
Load Resistance ◽  
Electrical Network ◽  
Synchronous Generators ◽  
Three Phase ◽  
Theoretical Foundations

The paper considers the study of the electromagnetic force (EMF) of a synchronous generator based on the three-phase induction machine. The stand includes: a frequency converter, an induction motor, a synchronous generator, a three-phase rectifier, an active load resistance, power protection and inclusion industrial electrical network. The study provides an analytical solution to one of the main objectives within theoretical foundations of electrical engineering, formulated so to reflect the decision making while designing new types of synchronous generators with permanent magnets.

scholarly journals Simulation of Three-Phase Salient Pole Generator under Operating Conditions

2019 ◽  
Vol 54 (4) ◽  
Author(s):  
Muayad A. Mukhlif ◽  
Khalid G. Mohammed ◽  
Settar S. Keream ◽  
Sara S. Mahdi
Keyword(s):  
Power Plants ◽  
Synchronous Generator ◽  
Operating Conditions ◽  
New Method ◽  
Impedance Method ◽  
Iron Core ◽  
Past Century ◽  
Synchronous Generators ◽  
Mathematical Methods ◽  
Three Phase

The three-phase synchronous generators are still the backbone of most electric power plants in the world. Many researchers still study synchronous generators in attempts to improve their performance and reduce losses in iron core, copper windings, friction ball bearings, and moments of inertia due to mass and rotor diameter. One of the important characteristics studied insynchronous generator behavior is the generator’svoltage regulation (VR%). Over the past century, researchers have developed four practical and mathematical methods to determine the value of the combined voltages of synchronous generators. This article describes a new method based on the impedance method, the magneto motive force (MMF) method, and the Potier method. The new method effectiveness evaluation is conducted via calculating the four methods and their application to a synchronous generator. The article also offers practical and theoretical recommendations to improve the results and increase flexibility in changing loads as their power factors change.

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