The subsynchronous resonance damping under different levels of series compensation in the network,and the effect of fault clearing time on the torque amplification are investigated. Subsynchronous resonance is an electrical power system condition where, electrical network exchanges energy with. Analytical assessment of subsynchronous resonance ssr. Effective method of subsynchronous resonance detection and. Pdf an idea is presented for damping ssr in power systems using a doubleorder svs auxiliary controller in. Readers guide to subsynchronous resonance ieee journals. Us52277a us07883,474 us88347492a us52277a us 52277 a us52277 a us 52277a us 88347492 a us88347492 a us 88347492a us 52277 a us52277 a us 52277a authority us unite. Since the early 1930s, numerous researchers have addressed issues relating to these problems. An earlier study to evaluate the potential for subsynchronous resonance ssr issues between the series capacitor and local generation was. Ssr is a resonant condition where the generator system exchanges energy with the connecting electrical system below the subsynchronous frequency. Abstractseries capacitor compensation in ac transmission systems may cause sub synchronous resonance that can lend to turbine generator shaft failure. Pdf an idea is presented for damping ssr in power systems using a double order svs auxiliary controller in. Offshore reinforcements are proposed by highvoltage directcurrent hvdc links. Download the complete project in adobe pdf 304 kb download here.
A novel approach was presented in this paper to analyze the characteristics and in. Method of characteristic has strict fundamentals of mathematics, sets up. Under all these circumstances, there is a risk of ssr conditions. Damping of subsynchronous resonance in an series compensated. Subsynchronous resonance accessscience from mcgrawhill.
The subject of the invention is a method of subsynchronous resonance detection in electrical power systems with series capacitors. When the level of series compensation is increased subsynchronous resonance will be more. It is shown that subsynchronous resonance is a linear stability problem, i. Subsynchronous resonance and factsnovel control strategy for. Subsynchronous resonance in power systems pdf anthony robbins books pdf in urdu, subsynchronous resonance and torsional interaction. The risk for subsynchronous resonance in case of wind farms constituted by the three main type of turbines fixed speed, fullpower converter and doublyfed induction generator, dfig, type, is briefly described. Analysis and control of subsynchronous resonance in the. Series capacities also have a tendency to amplify the shaft stress during major network transient events. Analysis of subsynchronous resonance in power systems k.
Their linearised models are also derived to study dynamic. This paper analyzes the ssr based on the location of shaft cracks and turbine generator mode. The history of subsynchronous resonance analysis by the navajo project. Isbn 9781461556336 digitally watermarked, drmfree included format. Since 1971, the year in which a case of subsynchronous resonance was first reported, there has been plenty of research into finding causes and designing countermeasures. Damping of subsynchronous resonance using a voltage. Subsynchronous resonance in power 56 fan l, zhixin m. Dec 01, 2012 the paper presents a novel approach for detection of subsynchronous resonance phenomenon ssr in a series compensated transmission system. However, negative damping still remains, and is large for firing angle 170 180. Subsynchronous resonance ssr in a series compensated transmission network. Get your kindle here, or download a free kindle reading app.
Resonance is the tendency of a system to oscillate at a greater amplitude at some frequencies than at others. The first one is smaller than the second one since. Download full damping of subsynchronous resonance and nonlinear dynamics in thyristor switching circuits book or read online anytime anywhere, available in pdf, epub and kindle. 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. 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. International journal of innovative research in science. Pdf overview of subsynchronous resonance analysis and. This potentially can lead to subsynchronous resonance ssr. The analysis for this generator unit has shown that there is negative damping for the 33. Pdf damping subsynchronous resonance in power systems. Under such circumstances, the turbinegenerator shaft. The first one, which is the resonance between c sc and the sum of l sys, l ls and l m, respectively.
The aim of the present paper is 10 investigate two types of ssr countermeasures. Subsynchronous resonance is thus a condition where the subsynchronous complement of the natural frequency of a series capacitorcompensated armature circuit of a turbine generator is close to its torsional natural frequencies, resulting in a strong coupling between the electrical and mechanical systems. Subsynchronous resonance protection 1 subsynchronous resonance protection mitigation. Problem was cured by reducing compensation percentage and installing a torsional relay. The effectiveness of bypass damping filter on suppressing ssr is verified and extended in multigenerator seriescompensated system. Pdf an ssscbased hybrid series compensation scheme. The electric reliability council of texas ercot ercot iso manages the flow of electric power to 23 million texas customers representing 85 percent of the states electric load. Subsynchronous resonance ssr problems in series compensated steamturbine power systems coexist with the beneficial effects provided by the series capacitors.
The subsynchronous d and the supersynchronous d damping contributions from torsional interaction are calculated for a certain mechanical mode frequency, f, and are compared with the assumed mecha nical mode damping. Robust finitetime controller for damping of subsynchronous resonance in doubly fed induction generator wind farm penghan li, jie wang, linyun xiong, meiling ma, muhammad w khan, and sunhua huang journal of vibration and control 0 10. But the hazards to turbinegenerators require that utility engineers fully understand and thoroughly analyze the effects of subsynchronous resonance ssr caused by series capacitors. Study of subsynchronous resonance and analysis of ssr ranjit m. Sub synchronous resonance damping in interconnected power systems. Effects of subsynchronous resonance on power systems 9 iv. Analysis of subsynchronous resonance characteristics and. Analysis of subsynchronous resonance in power systems. The subsynchronous resonance ssr characteristics of a series compensated system equipped with upfc are studied, and the results reveal that ssr characteristics of the system may vary significantly with. With an appropriate angle of thyristor firing, electrical damping becomes almost zero, which is called ssr neutral. Click get books and find your favorite books in the online library.
The second one is the resonance between c sc and the sum of l sys, l l s and l l r, respectively. Subsynchronous oscillations sso and powerworld applications at ercot anuj dixit and priya ramasubbu ercot planning and grid coordination may 21, 2014. Student, department of electrical engineering, govt. Technically, ssr problems are divided into three categories. Introduction for more than three decades, worldwide efforts have been made to investigate the fusion of the hydrogen isotopes deuterium and tritium for energy production. Title subsynchronous resonance damping control of thyristor. The frequency sweep method computational speed is fast, and operation is convenient, and usually as the prefered method of studying the subsynchronous resonance problem, but this method accuracy is not enough. Sub synchronous resonance damping in interconnected power. Review and mitigation of subsynchronous resonance using ieee. The subsynchronous resonance ssr is an important problem in the power system, and especially the. Detailed modelling and development of a laboratory. Subsynchronous resonance screening study for the pjm. Download product flyer is to download pdf in new tab.
Hopf bifurcation control of subsynchronous resonance utilizing. Currents flowing in the ac network have two components. A method of analysis of subsynchronous resonance net. Us52277a vernier control system for subsynchronous. Pdf damping of subsynchronous resonance and nonlinear. Application of bypass damping filter in suppressing subsynchronous. This work addresses contributions of synchronous generator rotor motion and induction generation to sustained subsynchronous oscillation.
Pdf analysis of subsynchronous resonance characteristics and. Fractionalorder pi based statcom and upfc controller to. Subsynchronous resonance ssr is the process which leads to the turbine generator shaft damage. Cn102753982b method and system of subsynchronous resonance. Subsynchronous resonance unpublished masters thesis. Use of facts devices in mitigating sub synchronous resonance. Subsynchronous resonance in power systems provides indepth guidance toward the parameters, modeling, and analysis of this complex subclass of power systems. Ppt subsynchronous resonance protection powerpoint. Frequencies at which the response is maximized are known as a systems resonant frequencies. Mitigating subsynchronous resonance torques using dynamic braking resistor s.
The system of coupled masses conveying mechanical energy to the generator rotor is not a. 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. Many utilities are either applying or considering applying series capacitors because of the economic advantage. Ssr is defined as a condition wherein an electrical net work exchanges energy with a turbine generator. Subsynchronous resonance and its mitigation for power system.
Pdf mitigating subsynchronous resonance torques using. Study of subsynchronous resonance and analysis of ssr open. 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. The definitions regarding sub synchronous resonance phenomenon is presented. A disturbance near a series capacitor excites current or voltage components at the electrical natural frequency. Voltage signals are measured on line and by using finding zero crossing points of discrete signal of measured voltage, positive and negative half cycles of the wave form of discrete signal of voltage are calculated in a computer device to which constant parameters. Board of directors meeting ercot public june, 2017. In all cases, subsynchronous resonance is due to the interaction of a series capacitor with turbinegenerator. Subsynchronous resonance risk assessment in interconnected. Subsynchronous resonance screening study for the pjm regional. There are two other types of subsynchronous resonance, the induction generator effect and torque amplification.
The definition includes any system condition that provides the opportunity for an exchange of energy. In this thesis, the problem of subsynchronous mechanical oscillations in the shaft assembly of a turbogenerator with its steam turbine stages is studied, when the generator is connected to a thyristor controlled series capacitor tcsc compensated transmission line. Subsynchronous resonance in series compensated transmission lines. Subsynchronous resonance mitigation cost estimation nyiso. The impact of wind farms on subsynchronous resonance in power. The resonance between a seriescapacitorcompensated electric system and the. Subsynchronous resonance in doublyfed induction generator. Jan 21, 2021 however, the risk of subsynchronous resonance ssr is the main issue raised in series compensated transmission systems.
Feltes senior manager, consulting ram nath, principal consultant rajat majumder, senior staff consultant rev. Subsynchronous oscillations sso and powerworld applications. Subsynchronous resonance is addressed in three categories,i. Mathematical calculations for subsynchronous system modeling subsynchronous resonance in power systems provides indepth guidance toward the parameters, modeling, and analysis of this complex subclass of power systems. Addressing subsynchronous resonance nprr562 overview.
Detailed modelling and development of a laboratory prototype. Three aspects of subsynchronous resonance ssr related problems in power systems are addressed in this dissertation which aims at contributing to a better understanding of these problems. Winnipeg, mb, canada 2electranix corporation winnipeg, mb, canada 1 western protective relay conference 2020. 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. Jan 17, 2020 the simple solution to enhance the power transfer capacity is the insertion of series capacitor in the line. Chapter 3 gives an overview of the problem of subsynchronous resonance in wind farms. Tutorial on subsynchronous resonance protection applied.
Thakre1, rambabu motamarri1 and chaitanya somu2 background series capacitor compensation has been broadly employed in power system to cancel a portion of reactance of the line impedance to increment the power transfer capabil. Subsynchronous resonance university of calgary prism. A number of principles are available for the experimental devices serving this purpose. Subsynchronous resonance ssr has gained its name from the fact that the frequencies of interest happen to lie in a region below the synchronous frequency of the network. Review and mitigation of subsynchronous resonance using.
Ssr is not a new phenomenon and has been mainly observed in steam turbine and nuclear based generator system 2. Cn102420434a method for analyzing subsynchronous resonance. Frequency analysis, electromagnetic transient analysis, and eigenvalues analysis have been mainly used for ssr analysis. Pdf new effective method of subsynchronous resonance detection. 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. It also mitigates subsynchronous resonance ssr accompanying conventional series capacitors. Overview of subsynchronous resonance analysis and control. Create free account to access unlimited books, fast download and ads free. May 02, 2017 control strategy of unified power flow controller upfc utilizing dq decoupling control is deduced in this paper, which can closely follow the control orders of the active and reactive power. Reduction of harmonic distortions and subsynchronous. The model is used to analyze the induction generator effect ige and torsional interaction in such systems. Subsynchronous resonance will become an important network condition to investigate when the new technologies are introduced in power systems. The need for such analysis is that to get a physical insight of the capability of doubly fed induction generator in providing damping to subsynchronous oscillations caused by series compensated transmission network.
A subsynchronous resonance prevention for dfigbased wind farms. In this paper, subsynchronous resonance ssr instability was accurately analyzed in doubly fed induction generator dfigbased. Robust finitetime controller for damping of subsynchronous. While most mathematical analysis done so far has attempted to retain as many details of the system as possible, we. Ssr occurs when a natural frequency of a series compensated transmission system coincides with the complement of one of the torsional modes of the turbinegenerator shaft system. The first threephase thyristor controlled series capacitor was installed in 1992. Apr 09, 2015 subsynchronous resonance screening study for the pjm regional transmission expansion plan prepared for pjm interconnection, llc submitted by. Ramakrishna, member, ieee, and abdelaty atyedris, senior member, ieee abstractthe recently proposed phaseimbalanced series ca pacitive. Subsynchronous resonance is a power system condition under which the electrical network interacts with turbinegenerator system at frequencies less than the synchronous frequency 50hz.
The electrical network has a strong negative damping component at this frequency, so. Overview of subsynchronous resonance analysis and control in. A simplified system for subsynchronous resonance studies. Subsynchronous resonance and its mitigation for power. Self excitation, series capacitors, subsynchronous. Emphasizing field testing to determine the data required, this book facilitates thorough and efficient oscillation and damping modeling using eigenvalues of a systems linear model. This article first analytically investigates the effect of ssr phenomenon on the doubly fed induction generator dfig dynamic behavior in a series compensated grid, and then proposes a proficient damping approach for. The two traditional dynamic frequency scanning approaches, modal response and signal injection method, are based on the analysis of the subsynchronous response of the electromechanical system on one single frequency at the time. Subsynchronous resonance damping control of thyristorcontrolled series capacitor naoto kakimoto, member, ieee, and anan phongphanphanee abstract a thyristorcontrolled series capacitor tcsc substantially improves transmission capacity.
The damping at the first resonance frequency is high because of a large negative slip s ss and. Pdf ebooks can be used on all reading devices immediate ebook download after. Pdf new effective method of subsynchronous resonance. Subsynchronous resonance in power systems anderson, paul m. Growing oscillations would represent a subsynchronous resonance condition with the risk of fatigue and damage to the rotor shaft assembly of a machine. Boukarim, subsynchronous resonance studies and mi tigation methods for series capa citor applications, ieee 2005. Tutorial on subsynchronous resonance protection applied to inverter based renewables nuwan perera1, kumara mudunkotuwa2 1erlphase power technologies ltd. Background ieee transactions on power apparatus and systems, volume. These tests results have given an optimistic view of designing the equipments to eliminate the concerned problem. The method of research subsynchronous resonance has frequency sweep method and method of characteristic at present. International journal of recent research aspects issn. Subsynchronous resonance characteristics in presence of. Hopf bifurcations, subsynchronous resonance, upfc, gto. Subsynchronous resonance ssr can be caused by series compensated lines, which would lead to turbogenerator shaft breakdown.
702 901 1512 1261 1591 1639 922 1298 1167 1601 569 1401 872 644 250 867 1485 1351 1290 1499 590 1684 1093 33 1308 1580 1736 579 1506 1210 527 390 906 1093 407 560 520 1560 883