Under all these circumstances, there is a risk of ssr conditions. This type of ssr is specifically labeled as subsynchronous control interaction ssci by the industry. Subsynchronous resonance accessscience from mcgrawhill. With the system represented in this way eigenanalysis can be performed. Subsynchronous resonancessr 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. For a multimachine system which has a set of identical parallel turbinegenerators or nonidentical turbinegenerators having torsional modes of the same frequency, generators may suffer from the same mode of torsional interaction.
Protective relay is an important component of the overall strategy of ssr protection for utilities that may encounter ssr problem. The purpose of this research is to establish understanding of challenges and issues facing the power networks planning, in particular the ssr conditions. Ssr is not a new phenomenon and has been mainly observed in steam turbine and nuclear based generator system 2. Overview of subsynchronous resonance analysis and control. Subsynchronous resonance will become an important network condition to investigate when the new technologies are introduced in power systems. Analysis of subsynchronous resonance in power systems power electronics and power systems.
An abstract of the thesis of connecting repositories. Delivering full text access to the worlds highest quality technical literature in engineering and technology. 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. Effects of subsynchronous resonance on power systems 9 iv. The system of coupled masses conveying mechanical energy to the generator rotor is not a rigid system. 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. Analysis of subsynchronous resonance effect in series compensated line with booster transformer international journal of electrical and electronics engineering ijeee, issn print. Subsynchronous resonance in doublyfed induction generator. Analysis of subsynchronous resonance characteristics and. This resonance is called as subsynchronous resonance ssr. The ieee task force on interharmonics was chaired by erich gunther and reported to the ieee harmonics working group. The ngh subsynchronous resonance ssr damping scheme designed to damp subsynchronous currents in the transmission lines and to protect the generating machines from subsynchronous resonance was.
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. Analysis of subsynchronous resonance in power systems power electronics and power systems pdf,, download ebookee alternative practical tips for a improve ebook reading. Subsynchronous resonance in power systems eigenvalues. Steam turbine and governor system subsynchronous resonance. Series capacitor compensation is used to improve the utilization of existing power systems. All other sub synchronous frequency interactions in power systems interactions of facts devices, network resonances etc. System configuration the system considered in the present work is the ieee second benchmark model 5 with additional. Systems that experience ssr exhibit dynamic oscillations at frequencies below the normal system base frequency 60 hz in north america. This book provides a tutorial description of the mathematical models and equation formulations that are required for the study of a special class of dynamic power system problems, namely subsynchronous resonance ssr. Analysing subsynchronous resonance phenomena in the timea. Ssr is a potential phenomenon which may arise in a power system when the mechanical system turbinegenerator exchanges energy with the electrical network 45. Subsynchronous oscillation is an electric power system condition where the electric network exchanges significant energy with a turbinegenerator at one or more of the natural frequencies of the combined system below the synchronous frequency of the system following a disturbance from equilibrium.
Emphasizing field testing to determine the data required, this book facilitates thorough and efficient oscillation and damping modeling using eigenvalues of a system s linear model. A simplified system for subsynchronous resonance studies. 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. Eigenanalysis of subsynchronous resonance in a multimachine power system. The scan covers the frequency range from 20 to 50 hertz and shows separate plots for the resistance and reactance as a function of f12 subsynchronous resonance in power systems 400 2 50 350 200 300 150 250 100 200 50 150 0 iii 100 5 0 0 ill 1 00, cq u i. Marija hic, francisco galiana, and lester fink, isbn. 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. Ssr is a state in which the power system exchanges the energy with the generator turbine at one or more frequencies below the synchronous. Application of bifurcation theory to subsynchronous. Resonance, ieee transactions on power apparatus and systems, vol. Analysis of subsynchronous resonance in power systems. Subsynchronous resonance in power systems pdf free download. Therefore, proper understanding and analysis of ssr is to be carried out while planning series capacitor compensation in power systems.
Analysis of subsynchronous resonance in a multimachine. 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. Subsynchronous resonance file exchange matlab central. Khu, kim touy, subsynchronous resonance in power systems. Ssr is a resonant condition where the generator system exchanges energy with the connecting electrical system below the subsynchronous frequency. Simplified transmission and generation system analysis procedures for subsynchronous resonance problems. R download it once and read it on your kindle device, pc, phones or tablets. Pdf damping subsynchronous resonance in power systems. Results of an investigation on the application of statcom for damping subsynchronous resonance ssr in a multimachine system is presented in this paper. Solutions to several of these problems are proposed.
Subsynchronous resonance in power systems free ebook download as pdf file. Subsynchronous resonance in power systems wileyieee. Currents flowing in the ac network have two components. Agenda for summer meeting 2001 in vancouver powerpoint file. Subsynchronous resonance in power systems eigenvalues and.
A supplementary active and reactive power to be delivered by wecss located near synchronous generators is designed to reduce the ssr phenomenon. Nayfeh electrical engineering abstract a bifurcation analysis is used to investigate the complex dynamics of two heavily loaded singlemachinein nitebusbar power systems modeling the characteristics of the board. Analysis of eigen properties to determine the locations for damping controllers. Modeling and resonance issues of wind farm integration with related facts applications. Subsynchronous resonance and factsnovel control strategy for. Subsynchronous resonance damping in interconnected. Electrical engineering by kim touy khu in charge of major work approved iowa state university ames, iowa 1977. Application of bifurcation theory to subsynchronous resonance in power systems by ahmad m. Analysis of subsynchronous resonance in power systems k. Subsynchronous resonance screening study for the pjm. Analysis of subsynchronous frequency interactions in. Controller tuning and subsynchronous damping controller design. Read mitigating subsynchronous resonance and damping power system oscillation in a series compensated wind park using a novel static synchronous series compensator control algorithm, wind energy on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
Subsynchronous resonance risk assessment in interconnected. 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 ssr problems in series compensated steamturbine power systems coexist with the beneficial effects provided by the series capacitors. With the use of above software, the first benchmark model is developed and simulated. A new subsynchronous oscillation sso relay for renewable. A linear representation of a system can be obtained by expanding the nonlinear function which express the nonlinear model about a steadystate operating point in a taylor series. Subsynchronous resonance in doublyfed induction generator based wind farms selam chernet c selam chernet, 2016. Analysis of subsynchronous resonance in power systems power electronics and power systems padiyar, k. For transmission systems with series compensation, its sending end generally has more than one unit, often with multiple units of a power plant or several power plants having short electrical distance from each other.
Emtp analysis the electromagnetic transients program emtp is a program for numerical integration of the system differential equations. Subsynchronous resonance mitigation using variablespeed. Use features like bookmarks, note taking and highlighting while reading analysis of subsynchronous resonance in power systems power electronics and power systems. However, the presence of the series capacitors in a power system has brought up the phenomenon of sub synchronous resonance ssr. This paper presents an overview of subsynchronous resonance issues in wind turbines including, analysis methods, modeling, the impact of control. A single line diagram of the first benchmark model given by ieee committee for the study of subsynchronous resonance is as shown in figure 1. Mitigating subsynchronous resonance and damping power.
Subsynchronous resonance ssr problems in series compensated steamturbine power systems coexist. Damping subsynchronous resonance in power systems article pdf available in iet proceedings generation transmission and distribution 1496. Subsynchronous resonances studies digital asset management. This work proposes a strategy to mitigate subsynchronous resonance ssr in synchronous generators using variablespeed wind energy conversion systems wecss based on full converter wind turbines. Whenever the load on an alternator is increased, the rotor speed slightly decreases, this speed is called as subsynchronous speed. What is sub synchronous resonance in a power system. Analysis of subsynchronous resonance in power systems power electronics and power systems kindle edition by padiyar, k. At this frequency there are chances of resonance occurance between the mechanical spring mass system of speed governor of turbine generator and series capacitor. Considering the rapid growth of wind turbines applications in power systems, the dynamic behavior of wind turbines, especially the subsynchronous resonance ssr is of interest to researchers. The rotor frequency at this speed is called as subsynchronous frequency. Subsynchronous resonancein power systems other ieee press books teleconferencing, edited by d. The scheme enhances the system performance considerably and torsional oscillations are damped out at all levels of series compensation and. Interharmonic chapter for 519 revision draft 3 pdf file interharmonic panel session paper sm 2001 vancouver pdf file.
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