Design of a New Nonlinear Excitation Controller Combined Differential Geometry with PID Theory

2012 ◽  
Vol 588-589 ◽  
pp. 1507-1511
Author(s):  
Xiao Juan Sun
Keyword(s):  
Differential Geometry ◽  
Single Machine ◽  
Feedback Linearization ◽  
Transient Stability ◽  
Infinite System ◽  
System Simulation ◽  
Control Effect ◽  
Nonlinear Excitation ◽  
Terminal Voltage ◽  
Simulation Results

This paper presents a nonlinear excitation controller for transient stability combined differential geometry theory with PID technology. The controller ties the output of linear multi-variable excitation controller with the output of PID. Exact feedback linearization theory of differential geometry is applied to the design of linear multi-variable excitation controller for the single machine infinite system. Simulation results show that, compared with the general differential geometric controller, the proposed controller has the better control effect on power system and which remarkably improves the terminal voltage deficiencies in the control of generator.

A New Nonlinear Excitation Control Strategy with Terminal Voltage Feedback

2012 ◽  
Vol 182-183 ◽  
pp. 1241-1244
Author(s):  
Xiao Juan Sun ◽  
Quan Min Guo
Keyword(s):  
Power System ◽  
Transient Stability ◽  
Control Effect ◽  
Nonlinear Excitation ◽  
Power Generator ◽  
Terminal Voltage ◽  
Single Machine Infinite Bus ◽  
Voltage Feedback ◽  
Generator Terminal ◽  
The Given

This paper presents a new nonlinear excitation controller for transient stability with voltage feedback of a synchronous power generator connected to a single machine infinite bus. In this design terminal voltage is introduced as a feedback. The proposed controller based on voltage feedback technique which enhance the transient stability of power system and stabilizes the terminal voltage about the given operating point when the fault occurs closer to the infinite bus bar. Simulation results show that, compared with the controller without voltage feedback, the proposed controller has better control effect on power system and which remarkably improves the deficiencies in the control of generator terminal voltage of the traditional control.

Excitation Control Based on Objective Holographic Feedbacks and Extended State Observer

2013 ◽  
Vol 448-453 ◽  
pp. 2540-2544
Author(s):  
Xian Rong Chang ◽  
Hai Sheng Zhang ◽  
Hui Yun Wang
Keyword(s):  
Transient Stability ◽  
State Observer ◽  
State Equation ◽  
Extended State Observer ◽  
Control Input ◽  
Excitation Control ◽  
Extended State ◽  
Control Effect ◽  
Nonlinear Excitation ◽  
Terminal Voltage

In order to improve the control effect of the generator excitation controller, this paper proposes an excitation control based on objective holographic feedbacks and extended state observer. First, nonlinear factors of the nonlinear equation is switched to the state equation which contains the control input factors by objective holographic feedbacks. Then, constructing a second extended state observer tracks and compensates uncertain disturbance, simultaneously reduces system parameters of control law. Finally, MATLAB is used for simulation, the results show that nonlinear excitation controller that this paper designs can not only improve static and transient stability of system, but also improve the precision and stability of the terminal voltage control better.

scholarly journals Analysis and design of different controllers for non-linear power systems

2013 ◽  
Vol 2 (3) ◽  
pp. 216
Author(s):  
Rekha Chaudhary ◽  
Arun Kumar Singh
Keyword(s):  
Power Systems ◽  
Power System ◽  
Feedback Linearization ◽  
Transient Stability ◽  
Voltage Regulation ◽  
Analysis And Design ◽  
Non Linear ◽  
Terminal Voltage ◽  
Initial Power ◽  
Direct Feedback

The objective of this paper is to design controller for non-linear power system using Direct Feedback Linearization technique to improve the transient stability and to achieve better voltage regulation. In case of fault in the power system, power angle and the terminal voltage are the parameters which are to be monitored. The simulation has been carried out taking different values of initial power angles and results were obtained for power angle and terminal voltage. To overcome the demerits of DFL-LQ optimal controller and DFL voltage regulator, co-ordinated controller is proposed. Simulation results show that transient stability of a power system under a large sudden fault has been improved by using co-ordinated controller.

Controller Optimization of Quadrotor UAV

2014 ◽  
Vol 709 ◽  
pp. 237-240
Author(s):  
Xin Zhao ◽  
Wei Ping Zhao ◽  
Song Xiang
Keyword(s):  
Genetic Algorithm ◽  
Steady State ◽  
Pid Controller ◽  
System Simulation ◽  
Stability Control ◽  
Control Model ◽  
Lateral Stability ◽  
Control Effect ◽  
Quadrotor Uav ◽  
Simulation Results

Adjusting method of traditional PID controller is complicated. The controller obtained by adjusting method of traditional PID may be not optimal. Therefore, present paper utilized the genetic algorithm to optimize the PID controller parameter of roll channel of quadrotor UAV. According to the feature of lateral stability control model of quadrotor UAV, ascend time of system, steady state error, and weighted overshoot are chosen as objective function. In order to obtain the better control effect, penalty function is used to limit the oscillation of system. Simulation results show that PID controller designed by the genetic algorithm possess the excellent flexibility, adaptability and can produce the better control effect.

A Nonlinear Excitation Controller Design Method for Terminal Voltage Regulation and Transient Stability Enhancement

2014 ◽  
Vol 15 (3) ◽  
pp. 279-290 ◽  
Author(s):  
Chongxin Huang ◽  
Kaifeng Zhang ◽  
Xianzhong Dai ◽  
Qiang Zang
Keyword(s):  
Power Systems ◽  
Transient Stability ◽  
Control Method ◽  
Controller Design ◽  
Design Method ◽  
Transient State ◽  
Voltage Regulation ◽  
Nonlinear Excitation ◽  
Generator Model ◽  
Terminal Voltage

Abstract This paper proposes a cascade control method to design a nonlinear excitation controller to guarantee the terminal voltage regulation and the transient stability. Firstly, a nonlinear automatic voltage regulator (NAVR) in the inner loop is designed to control the terminal voltage exactly. Secondly, the generator model including the NAVR is transformed to be a reduced one. Subsequently, based on the reduced generator model, the nonlinear power system stabilizer in the external loop is designed to enhance the transient stability of the power systems. Furthermore, a coordination strategy is presented to improve the performances of the terminal voltage regulation in the steady state and the stability in the transient state. Finally, the proposed method is verified by numerous simulation results.

scholarly journals Sliding Mode Control of Bi-directional DC/DC Converter in DC Microgrid Based on Exact Feedback Linearization

2020 ◽  
Vol 19 ◽  
Keyword(s):  
Differential Geometry ◽  
Feedback Linearization ◽  
Sliding Mode ◽  
Response Speed ◽  
Fast Response ◽  
Linearization Method ◽  
Nonlinear Property ◽  
Sliding Mode Controller ◽  
Dc Microgrid ◽  
Simulation Results

The nonlinear property of bi-directional DC/DC converter in DC Microgrid will cause large voltage disturbance. To solve the above problems, a exact feedback linearization method based on nonlinear differential geometry theory is proposed to realize the linearization of the converter. Moreover, considering the approaching speed of the linearized Bruno standard model, a sliding mode controller is designed by using the exponential approach law. The simulation results show that the method has fast response speed, strong antiinterference ability and good steady-state characteristics.

scholarly journals Proton Exchange Membrane Fuel Cells Modeling Using Chaos Game Optimization Technique

2021 ◽  
Vol 13 (14) ◽  
pp. 7911
Author(s):  
Ibrahim Alsaidan ◽  
Mohamed A. M. Shaheen ◽  
Hany M. Hasanien ◽  
Muhannad Alaraj ◽  
Abrar S. Alnafisah
Keyword(s):  
Fuel Cell ◽  
Objective Function ◽  
Proton Exchange Membrane ◽  
Optimization Technique ◽  
Proton Exchange ◽  
Simulation Performance ◽  
Terminal Voltage ◽  
Chaos Game ◽  
Simulation Results ◽  
Exchange Membrane

For the precise simulation performance, the accuracy of fuel cell modeling is important. Therefore, this paper presents a developed optimization method called Chaos Game Optimization Algorithm (CGO). The developed method provides the ability to accurately model the proton exchange membrane fuel cell (PEMFC). The accuracy of the model is tested by comparing the simulation results with the practical measurements of several standard PEMFCs such as Ballard Mark V, AVISTA SR-12.5 kW, and 6 kW of the Nedstack PS6 stacks. The complexity of the studied problem stems from the nonlinearity of the PEMFC polarization curve that leads to a nonlinear optimization problem, which must be solved to determine the seven PEMFC design variables. The objective function is formulated mathematically as the total error squared between the laboratory measured terminal voltage of PEMFC and the estimated terminal voltage yields from the simulation results using the developed model. The CGO is used to find the best way to fulfill the preset requirements of the objective function. The results of the simulation are tested under different temperature and pressure conditions. Moreover, the results of the proposed CGO simulations are compared with alternative optimization methods showing higher accuracy.

scholarly journals Over/Undervoltage and Undervoltage Shift of Hybrid Islanding Detection Method of Distributed Generation

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Manop Yingram ◽  
Suttichai Premrudeepreechacharn
Keyword(s):  
Control System ◽  
Distributed Generation ◽  
Hybrid Method ◽  
Detection Method ◽  
System Simulation ◽  
Detection Methods ◽  
Islanding Detection ◽  
Active Method ◽  
Passive Method ◽  
Simulation Results

The mainly used local islanding detection methods may be classified as active and passive methods. Passive methods do not perturb the system but they have larger nondetection zones, whereas active methods have smaller nondetection zones but they perturb the system. In this paper, a new hybrid method is proposed to solve this problem. An over/undervoltage (passive method) has been used to initiate an undervoltage shift (active method), which changes the undervoltage shift of inverter, when the passive method cannot have a clear discrimination between islanding and other events in the system. Simulation results on MATLAB/SIMULINK show that over/undervoltage and undervoltage shifts of hybrid islanding detection method are very effective because they can determine anti-islanding condition very fast.ΔP/P>38.41% could determine anti-islanding condition within 0.04 s;ΔP/P<-24.39% could determine anti-islanding condition within 0.04 s;-24.39%≤ΔP/P≤ 38.41% could determine anti-islanding condition within 0.08 s. This method perturbed the system, only in the case of-24.39% ≤ΔP/P ≤38.41% at which the control system of inverter injected a signal of undervoltage shift as necessary to check if the occurrence condition was an islanding condition or not.

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