scholarly journals Wide-Area Robust Decentralized Coordinated Control of HVDC Power System Based on Polytopic System Theory

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Shiyun Xu ◽  
Huadong Sun ◽  
Baiqing Li ◽  
Guangquan Bu ◽  
Jun Yi ◽  
...  
Keyword(s):  
Power System ◽  
Controller Design ◽  
Damping Ratio ◽  
Output Feedback Control ◽  
Coordinated Control ◽  
Operating Conditions ◽  
Wide Area ◽  
Design Algorithm ◽  
Loop Control ◽  
Loop Control System

The present study proposes a hierarchical wide-area decentralized coordinated control framework for HVDC power system that is robust to multiple operating conditions. The upper level wide-area coordinated controller is designed in the form of dynamic output feedback control that coordinates the lower level HVDC supplementary controller, PSS, and SVC. In order to enhance the robustness of the designed controller under various operating conditions, the polytopic model is introduced such that the closed-loop control system can be operated under strong damping mode in virtue of the stability criterion based on damping ratio. Simulation results demonstrate that the proposed controller design algorithm is capable of enhancing the system damping over four different conditions.

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.

On-Line Thermal Balancing Technique for a Large Turbo-Generator

1992 ◽  
Vol 114 (1) ◽  
pp. 60-66 ◽  
Author(s):  
M. Zumbach ◽  
G. Schweitzer ◽  
K. Schoellhorn
Keyword(s):  
Closed Loop ◽  
Control Strategies ◽  
Operating Conditions ◽  
Loop Control ◽  
Turbo Generator ◽  
Closed Loop Control System ◽  
Input Signals ◽  
Loop Control System ◽  
On Line ◽  
A New Technique

In this paper a new technique is proposed to rebalance automatically a large turbo-generator during operation. The sensitivity of the rotor unbalances to thermal asymmetries in the rotor is exploited by mounting some heating elements and using them as actively controlled actuators. The shaft vibrations are measured and used as input signals of the feedback controller. Unbalances thus can be compensated during rotor operation. A theoretical model of the thermo-elastic rotor has been developed and an appropriate closed-loop control system has been designed. The simulation results are verified on a special test rig with digital control allowing for varioius control strategies and various operating conditions.

Rapid Embedded Programming in the Mathworks Environment

2002 ◽  
Vol 2 (3) ◽  
pp. 237-241 ◽  
Author(s):  
Daniel Burns and ◽  
Thomas G. Sugar
Keyword(s):  
Code Generation ◽  
Engineering Students ◽  
Force Feedback ◽  
Controller Design ◽  
Computing System ◽  
Embedded Computing ◽  
Loop Control ◽  
Loop Control System ◽  
Embedded Computing System ◽  
Automatic Code

New, commercially available, automatic, code-generation tools are used in teaching and lab exercises to progress from controller design, to simulation, and finally to implementation on mechanical hardware. An embedded computing system consists of a dedicated, digital, electronic-processor that controls a system that interacts with the environment. Case studies highlighting a force-feedback joystick and motor servo control with encoder feedback are presented to illustrate laboratory exercises that teach mechanical engineering students hardware-in-the-loop control system design. Using these software tools, design iterations and multiple controllers are quickly simulated and downloaded to the actual hardware.

A New Stabilizing Controller Design Based on the Wireless Networked Control System

2013 ◽  
Vol 331 ◽  
pp. 294-298
Author(s):  
Xiao Hua Guo
Keyword(s):  
Control System ◽  
Controller Design ◽  
Networked Control System ◽  
Network Control ◽  
Linear Matrix ◽  
Stabilizing Controller ◽  
Loop Control ◽  
Time Varying Delay ◽  
Loop Control System ◽  
Close Loop Control

In order to improve the performance of the network control system based on the wireless sensor networks, a multi-hopping wireless communication and their effect on network time-varying delay is analyzed, and a new stabilizing controller is proposed based on the a clientserver model in this paper. Using of the linear matrix inequality and switched control system theory to obtain the stabilizing conditions of the close loop control system and give the output feedback controller design approach. Preliminary experimentation indicates the rationality and effectiveness of the proposed control algorithm.

Design of Observer-Based Robust Power System Stabilizers

2016 ◽  
Vol 3 (1) ◽  
pp. 38
Author(s):  
Hisham M. Soliman ◽  
Mahmoud Soliman
Keyword(s):  
Power Systems ◽  
Power System ◽  
Controller Design ◽  
Damping Ratio ◽  
Iterative Solution ◽  
Linear Matrix ◽  
Diagonal Form ◽  
Matrix Inequality ◽  
Great Loss ◽  
Wide Range

<p>Power systems are subject to undesirable small oscillations that might grow to cause system shutdown and consequently great loss of national economy. A model to describe power system dynamics for different loads is derived in the norm-bounded form. The first controller design is based on the derived model to achieve  robust stability against load variation. The design is based on a new Bilinear matrix inequality (BMI) condition. The BMI optimization  is solved interatively in terms of Linear Matrix Inequality (LMI) framework. The condition contains a symmetric positive definite full matrix to be obtained, rather than the commonly used block diagonal form. The difficulty in finding a feasible solution is thus alleviated. The resulting LMI is of small size, easy to solve. The second PSS design shifts the closed loop poles in a desired region so as to achieve a favorite  settling time and damping ratio via a non-iterative solution to a set of LMIs.  Simulation results based on single-machine and multi-machine power system models verify the ability of the proposed PSS to satisfy control objectives for a wide range of load conditions.</p>

scholarly journals Coordinated Control for a Group of Interconnected Pairwise Subsystems

2013 ◽  
Vol 2013 ◽  
pp. 1-10
Author(s):  
Chen Ma ◽  
Xue-Bo Chen
Keyword(s):  
Power System ◽  
Design Process ◽  
Information Structure ◽  
Controller Design ◽  
Coordinated Control ◽  
Interconnected System ◽  
Two Systems ◽  
Structure Constraint ◽  
System Inclusion

The implementation of pairwise decomposition is discussed on an interconnected system with uncertainties. Under the concept of system inclusion, two systems with the same expanded system achieved by the same expand transformation are considered as approximations. It is proven that a coordinated controller can be found to stabilize both the two systems. This controller is contracted from the coordinated controller of expanded system, with each pairwise subsystem having information structure constraint taken into consideration. At last, this controller design process is applied on a four-area power system treated as a group of subsystems with information structure constraints.

L1 Controller Design for a Flying Wing Unmmaned Aerial Vehicle

2013 ◽  
Vol 436 ◽  
pp. 18-24
Author(s):  
Adrian Mihail Stoica
Keyword(s):  
Controller Design ◽  
Design Method ◽  
Output Feedback Control ◽  
Controller Synthesis ◽  
Control Law ◽  
Design Algorithm ◽  
Unmanned Air Vehicle ◽  
Air Vehicle ◽  
Aerial Vehicle

The paper presents a design method for the control system of a flying wing unmanned air vehicle (UAV). A modified loop-shaping type configuration is adopted for the controller synthesis such that maneuverability, robustness with respect to modeling uncertainty and sensitivity reduction performances are accomplished. A stabilizing output feedback control law minimizing the $L_1$ norm of the resulting system is determined. The proposed design algorithm is illustrated by a case study.

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