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 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.

Development of Robust Excitation Controller for Synchronous Generator

2014 ◽  
Vol 573 ◽  
pp. 328-333
Author(s):  
R. Ramya ◽  
K. Selvi ◽  
M. Tamilvanan
Keyword(s):  
Output Voltage ◽  
Closed Loop ◽  
Synchronous Generator ◽  
Local Mode ◽  
Small Signal ◽  
Closed Loop System ◽  
Robust Controller ◽  
Sensitivity Approach ◽  
Single Machine Infinite Bus ◽  
The Stability

This paper deals with the design and evaluation of robust excitation controller for a single-machine infinite-bus power system. The design of the regulator guarantees the stability of the closed loop system and ensures the output voltage is maintained within an acceptable threshold. In addition, it damps out local mode oscillations for small signal disturbances. The designed robust controller is also analyzed under change in step input and disturbance, which limits the heavy oscillations on the speed ω and voltage. Glover-McFarlane loop shaping algorithm is applied in designing the robust excitation controller. Two different techniques such as Optimal control and mixed sensitivity approach is used in this paper. The performance of the AVR was analyzed and compared with IEEE type2 Exciter.

The Control and Model of Synchronous Generator on Ship

2012 ◽  
Vol 195-196 ◽  
pp. 1095-1101
Author(s):  
Le Luo ◽  
Lan Gao ◽  
Liang Chen ◽  
Liang Hu
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Simulation Model ◽  
Synchronous Generator ◽  
Excitation Control ◽  
Synchronous Generators ◽  
Simulation Test ◽  
Power Station ◽  
Model And Simulation ◽  
The Mathematical Model

This paper analyzes the characteristics of marine power station. The mathematical model and simulation model of synchronous generators AVR+PSS excitation control system was built. At last the simulation test of suddenly add load was did in MATLAB/simulink environment. The result shows that the excitation control system has well stability, rapidity and some robustness.

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.

Dynamic Performance Enhancement of Synchronous Generator Excitation via Nonlinear Backstepping Control

2017 ◽  
Vol 18 (4) ◽  
Author(s):  
Haitham Saad Mohamed Ramadan ◽  
Mohamed Becherif
Keyword(s):  
Power Systems ◽  
Transient Stability ◽  
Performance Enhancement ◽  
Dynamic Performance ◽  
Synchronous Generator ◽  
Nonlinear Character ◽  
Synchronous Generator Excitation ◽  
Single Machine Infinite Bus ◽  
The Stability ◽  
Nonlinear Backstepping Control

Abstract This paper addresses the transient stability problem in power systems of nonlinear character. A recursive nonlinear backstepping controller for improving the single machine infinite bus system’s dynamic behavior is proposed for the system global stabilization considering the network transfer conductances. Despite parameters uncertainties, nonlinear dynamics and/or disturbances, the feedback laws based on the backstepping approach are explicitly derived and the conservatism of the stability property is guaranteed for both lossy and lossless power system representations. Simulation results, via MATLAB™-Simulink, reveal that the proposed backstepping technique can be feasibly designed to ensure significant dynamic performance enhancements.

Optimal Control Research for the Wind Turbine PMSG Chaos Motion

2014 ◽  
Vol 543-547 ◽  
pp. 1291-1295 ◽  
Author(s):  
Lin Zheng Ren ◽  
Teng Fei Lei ◽  
Heng Chen ◽  
Rong Wang
Keyword(s):  
Optimal Control ◽  
Wind Turbine ◽  
Permanent Magnet ◽  
Synchronous Generator ◽  
Optimal Controller ◽  
Permanent Magnet Synchronous Generator ◽  
Dynamic Motion ◽  
Control Research ◽  
Simulation Results ◽  
Chaos Motion

In this paper, the dynamic motion of the wind turbine permanent magnet synchronous generator is studied. After the permanent magnet synchronous generator motion is analyzed, the system has a complex chaotic motion in some parameters condition. A controller is designed based on optimal control theory. The optimal controller is used to avoid PMSG chaos and ensure the system is stable. This controller is simple and easy to implement. The simulation results show the whole control system has the good performance. The wind turbine PMSG optimal controller can be used by the other researchers.

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.

Application of a DSP-Based Control System in a Course in Synchronous Machines and Excitation Systems

2012 ◽  
Vol 49 (3) ◽  
pp. 334-348 ◽  
Author(s):  
Damir Sumina ◽  
Neven Bulić ◽  
Mato Mišković
Keyword(s):  
Control System ◽  
Synchronous Generator ◽  
Synchronous Machines ◽  
Laboratory Model ◽  
Excitation Control ◽  
Voltage Reference ◽  
Synchronous Generators ◽  
C Programming Language ◽  
Graphical Environment ◽  
C Programming

The paper presents educational tools for students of an undergraduate course in synchronous generators and excitation systems. Laboratory exercises are based on the work with a laboratory model which consists of a digital control system and a synchronous generator connected to the power network. The code development is supported by two software tools where the code can be developed in the C or C++ programming language or in a graphical environment. In the Electrical Machines Laboratory, the presented laboratory model allows students to develop the code for excitation control, to learn how a conventional excitation control structure and various types of power system stabilisers function, to carry out experiments with a step change in the active power reference or voltage reference, and to record generator responses. The proposed approach offers students the opportunity to apply the knowledge they have acquired in lectures through practical work in the laboratory.

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