Applying Power System Stabilizers Part III: Practical Considerations

This version is available at https://strathprints.strath.ac.uk/50875/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. AbstractOffshore wind plant such as variable speed wind turbines (DFIG) will play an increasingly important role in future decades if ever-stringent requirements of energy security and low carbon emissions are to be met. Although some analysis of the impact of DFIG on system stability has previously been reported, none of it is based on a large network representing a real system, or the large network is simply not publicly available. This paper describes one such suitable equivalent dynamic network for stability studies based on the whole UK transmission system. The methodology for appropriate control system design and adjustment of the parameters under different dispatch conditions is presented. The network model is subsequently updated according to various National Grid future energy scenarios where DFIG models are appropriately added and distributed. Two important aspects contributing to future system stability are studied in detail, namely maximum value of the rate of change of frequency and transient stability. A number of detailed cases studies under varying wind penetration levels are presented which quantify the impact of key influencing factors such as the size of the largest generating unit for n-1 contingency, amount of primary system response, frequency dependency of load, and others. The study concludes that none of the individual factors can provide a complete solution and that careful cost benefit analysis is needed to determine the proper mix of services and reinforcements needed in the future.

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“…The auxiliary signal can be the generator power, frequency or generator speed. The typical transfer function of the PSS is [24]:…”

Section: Control System Designmentioning

confidence: 99%

Future stability challenges for the UK network with high wind penetration levels

Xia

O’Reilly

2015

IET Generation, Transmission & Distribution

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“…One effective way of suppressing the oscillations is that the auxiliary controllers which formed power system stabilizers (PSSs) are installed in the excitation power system of generators, to provide additional damping to the low-frequency power oscillations [1][2]. Since 1970s a variety of design procedures and algorithms have been proposed for the design of power system stabilizers using either linear or nonlinear models of power system.…”

Section: Introductionmentioning

confidence: 99%

Comparison of power system stabilizer design based on local and global model

Lv¹,

Littler³

2015

International Conference on Renewable Power Generation (RPG 2015)

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This paper introduces a localized phase compensation method for the design of power system stabilizers (PSSs) to suppress the oscillation occurred in a single-machine infinite-bus (SMIB) power system. The proposed method is used to design stabilizers to suppress power system oscillations and only requires the available generator and transformer parameters thus eliminating the need to receive and verify entire power system parameters. This paper establishes the extended linear Phillips-Heffron model for a SMIB system with a PSS installed in the generator and demonstrates application of the model to determine damping and thus preserve power system oscillation stability. The paper also presents several examples where the proposed method has been used with two models to design PSSs with comparative results presented in a case study.

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“…6, is considered. Many existing generators are commissioned with a PSS of this form.For the problem at hand, the gain and the time constants of conventional PSS are properly selected using a similar tuning procedure described in [7]. The parameters of used PSS and AVR are given in Appendix.…”

mentioning

confidence: 99%

Stability and voltage regulation enhancement using an optimal gain vector

Bevrani

Hiyama

2006

2006 IEEE Power Engineering Society General Meeting

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Abstract--This paper addresses a control methodology to enhance stability and voltage regulation for the existing power systems with conventional PSS and AVR equipments. The control design problem is reduced to find a new control loop including a simple fixed gain vector. In order to optimal tuning of gain elements, the problem is formulated via an ∞ H static output feedback ( ∞ H -SOF) control technique, and the solution is easily carried out using a developed iterative linear matrix inequalities (ILMI) algorithm. A singlemachine infinite-bus system example is given to illustrate the developed approach. The results of the proposed control strategy are compared with conventional PSS design. The robust controller is shown to maintain the robust performance and minimize the effect of disturbance properly. I. INTRODUCTIONower systems continuously experience changes in operating conditions due to variations in generation/load and a wide range of disturbances [1]. Power system stability and voltage regulation have been considered as an important problem for secure system operation over the years. Currently, because of expanding physical setups, functionality and complexity of power systems, the mentioned problem becomes a more significant than the past. That is why in recent years a great deal of attention has been paid to application of advanced control techniques in power system as one of the more promising application areas.On the other hand, the real-world power systems still use the simple controllers that their parameters are usually tuned based on classical, experiences and trial-and-error approaches. Although these controllers are incapable to obtain good dynamical performance for a wide range of operating conditions and disturbances, however, the real electric industry because of some probable risks, bugs and/or having a The performance of these schemes essentially depends upon the selection of switching time. Moreover, using different control surfaces through a highly nonlinear structure increases the complexity of designed controllers.This paper presents a methodology to enhance the stability and voltage regulation of existing power system without opening their conventional PSS and AVR devices. The methodology provides a simple vector gain in parallel with the conventional control devices. The design objectives are formulated via an H∞ static output feedback (H∞-SOF) control problem and the optimal static gains are obtained using a developed iterative linear matrix inequalities (ILMI) algorithm.The resulting control framework is not only robust but it also allows direct and effective trade-off between voltage regulation and damping performance. The proposed controller uses the well available measure signals and has merely proportional gains; so gives considerable promise for implementation, especially in a multi-machine system. In fact the proposed control strategy attempts to make a bridge between the simplicity of control structure and robustness of stability and performance to satisfy the simultaneous ...

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Applying Power System Stabilizers Part III: Practical Considerations

Cited by 176 publications

References 12 publications

Future stability challenges for the UK network with high wind penetration levels

Future stability challenges for the UK network with high wind penetration levels

Comparison of power system stabilizer design based on local and global model

Stability and voltage regulation enhancement using an optimal gain vector

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