Subsynchronous resonance ssr is the buildup of electrical and mechanical vibrations in power system as a result of interactions and energy interchanges between a turbine generator set and the. Damping of subsynchronous oscillations using statcom a. Series capacities also have a tendency to amplify the shaft stress during major network transient events. Sub synchronous oscillations sso investigation and.
System disturbances cause sudden changes in subsynchronous resonance is. There are two other types of subsynchronous resonance, the induction generator effect and torque amplification. Damping of torsional oscillations a dissertation submitted to the graduate faculty in partial fulfillment of the requirements for the degree of doctor of philosophy major. Many countermeasures to ssr problem have been reported in the literature, which makes use of signals available at the generator station. Subsynchronous resonance mitigation for series compensation. Identification and analysis of subsynchronous oscillations. Elmarsafawy, use of frequencyscan techniques for subsynchronous resonance analysis of a practical series capacitor compensated ac network, proceedings of iee generation, transmission and distribution conference, vol. Subsynchronous resonance will become an important network condition to investigate when the new technologies are introduced in power systems. This research article proposes a powerful fractionalorder pi controller to mitigate the subsynchronous oscillations in turbinegenerator shaft due to subsynchronous resonance ssr with flexible ac transmission system devices such as static synchronous compensator statcom and unified power flow controller upfc. Control of catastrophic bifurcations of ssr in a hybrid. Diagnostics of subsynchronous vibrations in rotating machinery methodologies to identify potential instability. Bhavik prajapati, vadodaragujarat,india abstractssr basically an electrical power system condition where electrical network exchange energy. Eigenvalue analysis of ieee fbm for subsynchronous resonance studies rushabhkumar d.
Case studies and experiences with subsynchronous resonance. Subsynchronous resonance is an electric power system condition where the electric network exchanges energy with a turbine at one or more of the natural fequencies of the combined system below the synchronous frequency of. Based on the mechanism of subsynchronous resonance in dfig, the electromagnetic torque variation under the variation of rotor speed can be divided into two parts, i. Analysis of subsynchronous resonance in power systems kluwer international series in engineering and computer science, issn 08933405 volume 471 of kluwer international series in engineering and computer scinece. The effects of both series compensation level and fault clearing time on ssr are investigated. Subsynchronous oscillations sso and powerworld applications. This system is an ieee benchmark 1 used to study subsynchronous resonance and particularly torque amplification after a fault on a seriescompensated power system. Mar 21, 2011 subsynchronous resonance is a very serious problem. The example described in this section illustrates modeling of series compensation and related phenomena such as subsynchronous resonance in a transmission system. In most of cases there are a lot of torrents containing the same data serial, movie, magazine number, etc. An abstract of the thesis of connecting repositories.
Analysis of subsynchronous resonance in power systems abstract approved. This paper investigates the presence of bifurcations of subsynchronous resonance. Subsynchronous resonance is a condition that can exist on a power system wherein the network has natural frequencies that fall below the nominal 60 hertz of the network applied voltages. You can also select a web site from the following list. Subsynchronous resonance of wind farm in dfig file. Modal analysis is used to study ssr over a wide range of series compensation percentages. The various modes of oscillations such as subsynchronous resonance ssr. Further, the frequency analysis and eigen value analysis are performed and results are discussed. Subsynchronous resonance accessscience from mcgrawhill.
A simplified system for subsynchronous resonance studies k. Subsynchronous resonance fileexchange50647subsynchronousresonance, matlab. Effective method of subsynchronous resonance detection and. The diminution of ssr is achieved by the raising of network damping at those. Bhavik prajapati, vadodaragujarat,india abstractssr basically an electrical power system condition where electrical network exchange energy with the turbine generator at one or more natural. Damping subsynchronous oscillations an intelligent. Damping of subsynchronous resonance in an series compensated system using pscad naresh babu. Analysis of subsynchronous resonance in power systems k. Further, the frequency analysis and eigen value analysis are. This example shows subsynchronous resonance ssr in steam turbine and governor on a seriescompensated network. Ieee second benchmark model of subsynchronous resonance 2 is a well known and commonly use model of seriescompensated transmission system for study of subsynchronous resonance phenomena. Sub synchronous oscillations sso investigation and applications. Livermore, luke, ugalde loo, carlos ernesto, mu, qing, liang, jun, ekanayake, janaka and jenkins, nicholas 2014. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext.
The main advantages of using universal torrent checker. Analysis of subsynchronous resonance ssr in doublyfed. Subsynchronous resonance in doublyfed induction generator based wind farms selam chernet c selam chernet, 2016. Analysis of subsynchronous torsional interaction of hvdc system integrated hydro units with small generatortoturbine inertia ratios abstract the constant current controllers at high voltage direct current hvdc rectifier stations and the outer loops.
New effective method of subsynchronous resonance detection. I need to model all the masses of synchronous generator including the exciter mass to study subsynchronous resonance in the system. Under all these circumstances, there is a risk of ssr conditions. Feltes senior manager, consulting ram nath, principal consultant rajat majumder, senior staff consultant rev. In all cases, subsynchronous resonance is due to the interaction of a series capacitor with turbinegenerator. Subsynchronous resonance risk assessment in interconnected. The effect of wind turbines on subsynchronous resonance. Steam turbine and governor system subsynchronous resonance open model this example shows subsynchronous resonance ssr in steam turbine and governor on a seriescompensated network. Identification and analysis of subsynchronous oscillations in dfig based wind power plants.
Polytechnic, gadchiroli 2 assistant professor, electrical engineering, govt. Analysis of subsynchronous resonance ssr in doublyfed induction generator. In this paper, the damping of subsynchronous oscillations using statcom, which is provided at the middle of the transmission line, is presented. Pdf simulation and analysis of subsynchronous resonance in a. Apr 27, 2015 subsynchronous resonance is an electric power system condition where the electric network exchanges energy with a turbine at one or more of the natural fequencies of the combined system below the synchronous frequency of the system. When the level of series compensation is increased subsynchronous resonance will be more. This is the best way to not to omit, for example, a new episode of your favorite serial, or any other kind of your torrents update.
This device has been widely used in ac transmission system to enhance the power transfer capability with reducing the line reactance. Would please help me in this issue and let me know how i can model the exciter mass in the synchronous generator in matlab\simulink. In this paper, an important application of the second benchmark system and matlab is presented to study subsynchronous resonance that may occur in series compensated transmission systems in particular, the simulation of the torque amplification and eigenvalue analysis of the electrical network. Fractionalorder pi based statcom and upfc controller to. This paper analyses the sub synchronous resonance in series compensated transmission system. Subsynchronous resonance in doublyfed induction generator. The sub synchronous resonance ssr is a significant problem in power system. Simulation of ieee first banchmark model for ssr studies ijsrdvol. Improved control strategy for subsynchronous resonance. Subsynchronous resonance is addressed in three categories,i. Seriescompensated transmission system description of the transmission system. But, there is not any option to add the exciter mass to matlab \simulink. The resonance between a seriescapacitorcompensated electric system and the mechanical springmass system of a turbinegenerator at subsynchronous frequencies, that is, at frequencies that are less than the synchronous frequency.
Sub synchronous resonance damping in interconnected power. Download it once and read it on your kindle device, pc, phones or tablets. Resonance ssr, which may lead to torsional oscillations of turbine. How model the exciter mass in synchronous generator in. May 14, 2018 subsynchronous not comparable of a frequency that is a submultiple of another of a satellite orbiting closer to a planet that if it were in a synchronous orbit. It consists in a single generator 600 mva22kv60 hz3600 rpm connected to an infinite bus via two transmission lines, one of which is 55% seriescompensated. Subsynchronous resonance in power systems provides indepth guidance toward the parameters, modeling, and analysis of this complex subclass of power systems. Damping of subsynchronous resonance using a voltage source. Eigenvalue analysis of ieee fbm for subsynchronous. Simulation results have been carried out in power systems computeraided design, with system analysis conducted in matlab.
Pdf damping of subsynchronous resonance using a voltage. Supplementary damping controller design for sssc to. Also, this can cause shaft damage as simulated using matlab for comparison. Fortunately, it is not a problem that is encountered very often.
Damping of subsynchronous modes of oscillations 77 journal of engineering science and technology june 2006, vol. Find out information about subsynchronous resonance. Vance rotordynamic instability can be disastrous for the operation of high speed turbomachinery in the industry. Subsynchronous resonance, university power engineering conference upec 2011, soest, germany, sept. Mathematical calculations for subsynchronous system modeling. Ieee subsynchronous resonance working groupsecond benchmark model for computer. Matlab ode solvers using only 1 winding on the rotor.
The definition includes any system condition that provides the opportunity for an exchange of energy. Matlabsimulink model of the sample turbinegenerator and infinite bus. Emphasizing field testing to determine the data required, this book facilitates thorough and efficient oscillation and damping. Subsynchronous resonance screening study for the pjm. Run the command by entering it in the matlab command window. Design of subsynchronous resonance protection and reduction of torsional interaction in power systems mahdi hedayati department of electrical engineering azad university, gonabad branch gonabad, iran abstractan ssr problem has been noticed and caused repeated triggering of the protection. Analysis of subsynchronous resonance in power systems power. Supplementary damping controller design for sssc to mitigate subsynchronous resonance. However, the frightening factor in inserting the series capacitor is subsynchronous resonance ssr oscillations which can lead to shaft fatigue between turbine and generator set. Based on your location, we recommend that you select. In this paper a supplementary controller for the sssc based on a simple leadlag structure is proposed. Issn 17518687 damping of subsynchronous resonance using a. Three aspects of subsynchronous resonance ssr related problems in power. Universal torrent checker allows you to track your torrents and check their updates automatically.
Therefore, the discussed ssr detection algorithm has been evaluated with using the input data obtained from matlab simuling second. The paper presents a novel approach for detection of subsynchronous resonance phenomenon ssr in a series compensated transmission system. Secondly, the effect of incorporating fsigwts into fbm on ssr is studied over a. Application of statcom for damping subsynchronous resonance in a multimachine system yanlong sun, liangeng ban, daye yang, yizhen wang china electric power research institute, beijing, china email. Subsynchronous resonance is an electric power system condition where the electric network exchanges energy with a turbine at one or more of the natural fequencies of the combined system below the synchronous frequency of the system.
Boukarim, subsynchronous resonance studies and mi tigation methods for series capa citor applications, ieee 2005. Shortly after the second event, it was determined that the torsional oscillations were caused by torsional interaction, which is a type of subsynchronous resonance ssr. Subsynchronous resonance ssr is the process which leads to the turbine. The fact that there is a resonance means that as the shaft is. Implementation and control of a dfim in matlab simulink. The only widely known instance of a turbine generator failure attributable to this phenomenon was actually two failures at the navajo generating station in the southwestern part of the us in the early 1970s. Boukarim, subsynchronous resonance studies and mi tigation methods for. A freeware program designed to make it easy to exchange power flow cases. Nevertheless, one of the reasons impeding the use of series capacitive compensation widely with wind farms is the potential threat of subsynchronous resonance ssr, especially at high compensation levels.
The simple solution to enhance the power transfer capacity is the insertion of series capacitor in the line. V2 department of eee, valliammai engineering college, srm nagar, kathangulathur 603203, kanchipuram district, tamil nadu, india1, 2 abstractseries capacitor compensation in ac transmission systems may cause sub synchronous. Hybrid series compensation is a combination of active and passive series compensation provided by static synchronous series compensator with energy storage sssces and capacitor, respectively. Matlab simulink model for analyzing the sub synchronous resonance effect. Subsynchronous resonance file exchange matlab central.
Subsynchronous resonance is an electric power system condition where the electric network exchanges energy with a turbine generator at one or more of the natural frequencies of the combined system below the synchronous frequency of the system. Eigenvalue analysis of subsynchronous resonance study in. Then, a simulation model is built in matlabsimulink. Virulkar 2 1lecturer in electrical engineering, govt. The system is sensitive under subsynchronous resonance condition further a small fault or disturbance causes increase of turbinegenerator oscillations and furthermore increases the stress and twist between the shaft sections that will damage the entire system. An electrical resonant frequency on an alternatingcurrent transmission line that is less than the line frequency, and results from the insertion of series. Damping sub synchronous resonance in turbine international.
Steam turbine and governor system subsynchronous resonance. Abstractseries capacitor compensation in ac transmission systems may cause sub synchronous resonance that can lend to turbine generator shaft failure. Electrical engineering by kim touy khu in charge of major work approved iowa state university ames, iowa 1977. Pdf simulation of ieee first banchmark model for ssr. Problem was cured by reducing compensation percentage and installing a torsional relay. Damping of subsynchronous resonance in an series compensated. Subsynchronous resonance in doublyfed induction generator based wind farms selam chernet department of energy and environment chalmers university of technology abstract the objective of this thesis is to investigate the risk for instabilities due to subsynchronous resonances ssr conditions in large wind farms connected to seriescompensated. Powerworlds wide range of products provide the tools needed by transmission planners, power marketers, system operators and trainers, educators, and anyone else desiring access to power system information and analysis in a userfriendly format. The shaft of rotating equipment always has a natural resonant frequency. The results verify the ssr mitigation strategy has good dynamic performance. The presented method is designed to detect subsynchronous resonance frequency and amplitude in very short time to prevent the failure of transmission systems, which can likely happen if the subsynchronous resonance amplitude is not be mitigated quickly enough. Ssr studies with integrated dfig wind turbine to grid through series compensated transmission network is simulated in matlab and the eigen value analysis is carried out.
The system was tuned to the torsional mode 1 based on table 1. Sep 19, 2016 this research article proposes a powerful fractionalorder pi controller to mitigate the subsynchronous oscillations in turbinegenerator shaft due to subsynchronous resonance ssr with flexible ac transmission system devices such as static synchronous compensator statcom and unified power flow controller upfc. Analysis of subsynchronous resonance in power systems power electronics and power systems kindle edition by k. Currents flowing in the ac network have two components. Analysis of subsynchronous torsional interaction of hvdc. Subsynchronous resonance screening study for the pjm regional. Damping of subsynchronous resonance using a voltage source converterbased highvoltage directcurrent link in a seriescompensated great britain transmission network. Eigenvalue analysis of subsynchronous resonance study in series compensated wind farm gajanan v. In this research paper, an experimental set up which demonstrates generation, transmission and distribution with. The subsynchronous resonance ssr for ieee second benchmark system is simulated using matlab based on the power system blockset in conjunction with simulink. Subsynchronous resonance screening study for the pjm regional transmission expansion plan prepared for pjm interconnection, llc submitted by.
Mitigation of subsynchronous resonance with fractionalorder. It is the first time that the capability of damping controllers are clarified for both ssr and ssto. Subsynchronous resonance in power system one of the conventional series compensators in power systems are series capacitors that are employed for compensation of the inductive reactance of the transmission lines. Resonance in the line may create sub synchronous frequency or super synchronous frequency which leads to fatigue in the turbine generator shaft system. Design of subsynchronous resonance protection and reduction. Subsynchronous resonance damping in interconnected power. That resonant frequency may fall below the actual operating speed of the equipment. This webinar on sub synchronous oscillations was presented on october 14, 2016 7pm cst. The fixed series capacitor is inserted into a transmission line to increase the maximum transmittable power. Subsynchronous resonance studies and mitigation methods for.