Nonlinear Robust Adaptive Control for Static Var Compensator Based on Backstepping and Dissipative System Theory

2012 ◽  
Vol 433-440 ◽  
pp. 5935-5940
Author(s):  
Lei Zhang ◽  
Ai Min Zhang ◽  
Jiu Qiang Han ◽  
Hang Zhang
Keyword(s):  
System Theory ◽  
Power System ◽  
Transient Stability ◽  
Adaptive Estimation ◽  
Dissipative System ◽  
Robust Adaptive Control ◽  
Static Var Compensator ◽  
Nonlinear Controller ◽  
Robust Adaptive ◽  
Single Machine Infinite Bus

Based on adaptive backstepping nonlinear control scheme and dissipative system theory, the robust adaptive nonlinear controller is designed for single machine infinite bus (SMIB) power system with static Var compensator (SVC), which conquers the obstacle of relative degree one of passivity feedback scheme. During the procedure of designing controller and parameter estimator, the uncertainties of disturbances and the damping coefficient are taken into account; therefore, the designed controller has the ability of robustness and adaptive estimation. The globally uniformly boundness of all the states in the system and the asymptotical stability of the system errors are verified by the theories. Simulation experiments show that not only the transient stability of the SVC power system is guaranteed, but also the robustness performance is significantly improved even with disturbances.

Nonlinear coordinated control design of generator excitation and static var compensator for power system via input-output linearization

2020 ◽  
pp. 014233122096436
Author(s):  
Salma Keskes ◽  
Souhir Sallem ◽  
Mohamed Ben Ali Kammoun
Keyword(s):  
Power System ◽  
Single Machine ◽  
Short Circuit ◽  
Synchronous Generator ◽  
Voltage Regulation ◽  
Static Var Compensator ◽  
Input Output ◽  
Nonlinear Controller ◽  
Single Machine Infinite Bus ◽  
Input Output Linearization

This paper proposes a nonlinear coordinated controller for a single machine infinite bus power system. The later consists of a synchronous generator connected to the infinite bus via transmission lines, which are equipped with a static var compensator. The proposed control strategy aims to control simultaneously the excitation system of the synchronous generator and the static var compensator in order to improve transient stability and voltage regulation. The input output linearization theory and pole-assignment technique are employed to design the nonlinear controller. The controller’s performance in single machine infinite bus power system is then examined using simulation studies when the studied power system is subjected to three-phase short circuit with a 100ms duration. The results validate the efficiency of the proposed controller, which is based mainly on the good regulation of the static var compensator voltage with removing the static error after fault elimination.

Study on Improving Power System Damping by Using DPFC

2014 ◽  
Vol 986-987 ◽  
pp. 1286-1290
Author(s):  
Jin Li ◽  
Ya Min Pi ◽  
Hui Yuan Yang
Keyword(s):  
Power System ◽  
Power Flow ◽  
Transient Stability ◽  
Stability Control ◽  
System Stability ◽  
Single Machine Infinite Bus ◽  
Formula Derivation ◽  
Object Of Study ◽  
Power System Oscillations ◽  
Distributed Power Flow

In this paper, the series converters of Distributed Power Flow Controller are the main object of study. Its mechanism of suppressing power system oscillations is studied by theoretical analysis and formula derivation, which relies on a single-machine infinite-bus power system, installed the series converters. Then based on the mechanism, adopting the classic PI control and the damping controller, designed the transient stability control loop for the series converters. Finally, simulations performed by PSCAD/EMTDC, the results show that DPFC device can effectively suppress oscillation and improve system stability.

scholarly journals Modified SCA algorithm for SSSC damping Controller design in Power System

2017 ◽  
Vol 16 (1) ◽  
pp. 46-63 ◽  
Author(s):  
Bidyadhar Rout ◽  
B.B. Pati ◽  
S. Panda
Keyword(s):  
Power System ◽  
Transient Stability ◽  
Controller Design ◽  
Search Algorithm ◽  
Gravitational Search Algorithm ◽  
Differential Evolution Algorithm ◽  
Operating Conditions ◽  
Bench Mark ◽  
Single Machine Infinite Bus ◽  
System Stabilizer

This paper studies the improvement of transient stability of a single-Machine Infinite-Bus (SMIB) power system using Proportional Derivative (PD) type Static Synchronous Series Compensator (SSSC) and damping controllers. The design problem has been considered as optimisation problem and a modified version of recently proposed Sine Cosine Algorithm (SCA) has been employed for determining the optimal controller parameters. Proposed modified SCA (mSCA) algorithm is first tested using bench mark test functions and compared with SCA, and other heuristic evolutionary optimization algorithms like Grey Wolf optimization (GWO), Particle Swarm optimization (PSO), Gravitational Search algorithm (GSA) and Differential Evolution algorithm to show its superiority. The proposed mSCA algorithm is then applied to optimize simultaneously the PD type lead lag controller parameters pertaining to SSSC and power system stabilizer(PSS). The proposed controller provides sufficient damping for power system oscillation in different operating conditions and disturbances. Results analysis reveal that proposed mSCA technique provides higher effectiveness and robustness in damping oscillations of the power system and increases the dynamic stability more.

Whole-Range Nonlinear Large Disturbance Attenuation Controller Design for Turbo Generator Steam Valve Systems

2013 ◽  
Vol 136 (1) ◽  
Author(s):  
Nan Jiang ◽  
Ting Liu ◽  
Shengtao Li ◽  
Xiujuan Dong
Keyword(s):  
Transient Stability ◽  
Controller Design ◽  
Short Circuit ◽  
Disturbance Attenuation ◽  
Nonlinear Controller ◽  
Turbo Generator ◽  
Control Scheme ◽  
Steam Valve Control ◽  
Single Machine Infinite Bus ◽  
Large Disturbance

For a class of strongly nonlinear reheat-type turbo generator steam valve control problem, a whole-range nonlinear adaptive large disturbance attenuation control scheme is investigated based on the Minimax and adaptive Backstepping method. The effect of unknown external disturbances on the rotor angle and the rotor speed of the generator are considered. The Minimax method is used to reduce effectively the conservativeness of the disturbance treatment, which is brought by the estimation of the upper bound of the disturbance and the inequality scaling. The purpose is to ensure the robustness and insensitivity to effects of large disturbances of the closed-loop system. By considering the effect of the short-circuit ground fault and the mechanical power of disturbances, an application of the single-machine infinite-bus system is researched. Simulation results show that the control scheme can effectively improve the dynamic process of the transient stability of the power system. Compared with the conventional nonlinear controller, the control scheme has more advantages for large disturbances, and the process of controller design is simple and intuitive.

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.

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