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Transient Stability Enhancement of Power System Using STATCOM
P. Bhavani Sankar,Ch. Sai Babu
International Journal of Electrical and Power Engineering , 2012,
Abstract: The increased demands on transmission, absence of long term planning and need to provide open access to generating companies and customers have together created tendency towards less security and reduced quality of supply. Essentially, FACTS opens up new opportunities for controlling power and enhancing the usable capacity. The development of FACTS controllers has followed 2 distinctly different technical approaches, both resulting in a compressive group of controllers able to address targeted transmission problems. The first group employs reactive impedances or a tap-changing transformer with thyristor switches as controlled-elements; the second group uses self-commutated static converters as controlled voltage sources. The Static Synchronous Compensator (STATCOM), based on the voltage source inverter is a widely used FACTS device. This study deals with the basic simulation of STATCOM and demonstration of transient stability enhancement using STATCOM through MATLAB/ SIMULINK.
Power System Dynamic Stability Enhancement Using Fuzzy Controlled STATCOM
Electrical and Electronic Engineering , 2011, DOI: 10.5923/j.eee.20110101.02
Abstract: This paper aims for linearized Phillips-Heffron model of power system installed with static synchronous compensator (STATCOM) and demonstrates the application of the model in analysing the damping effect of STATCOM and designing a STATCOM stabiliser to enhance power system oscillation stability. A Single Machine Infinite Bus (SMIB) system installed with STATCOM is considered which shows the negative damping influence of STATCOM DC voltage regulator on power system oscillations and the effectiveness of AC damping stabilizer installed in the STATCOM AC voltage regulator in order to counterattack the negative damping effect is demonstrated. Fuzzy logic controller is also designed for AC damping stabilizer in order to damp out the low frequency oscillations of power system. The entire performance of SMIB system installed with STATCOM and with various damping controllers along with fuzzy AC damping controller is analysed and tested using MATLAB simulation studies.
Effect of Supplementary STATCOM Stabilizer Tuned Based on Simulated Annealing on Dynamic Stability Improvement in Electric Power System  [cached]
M. Nikzad,S. Shams Shamsabad Farahani,M. Bigdeli Tabar,M. Ghasemi Naraghi
Research Journal of Applied Sciences, Engineering and Technology , 2011,
Abstract: In this study, the performance of supplementary stabilizer for static synchronous compensator (STATCOM) tuned based on simulated annealing in order to improvement of dynamic stability is studied. Since STATCOM is usually used for damping Low Frequency Oscillations (LFO), a supplementary stabilizer is incorporated with STATCOM to reach the mentioned purpose. Simulated annealing (SA) as a heuristic optimization technique is used for tuning the parameters of the STATCOM supplementary stabilizer. The IEEE 14 bus test system is considered for achieving simulation results .In order to show the ability of SA-based STATCOM to damp LFO, the system responses in case with and without STATCOM are compared. Also two different operation conditions i.e. normal and heavy have been considered for better examination of SA-based STATCOM performance. Several nonlinear time-domain simulation tests visibly show the ability of STATCOM in damping of power system oscillations and consequently stability enhancement.
Integrating STATCOM and Battery Energy Storage System for Power System Transient Stability: A Review and Application  [PDF]
Arindam Chakraborty,Shravana K. Musunuri,Anurag K. Srivastava,Anil K. Kondabathini
Advances in Power Electronics , 2012, DOI: 10.1155/2012/676010
Abstract: Integration of STATCOM with energy storage devices plays an imperative role in improving the power system operation and control. Significant research has been done in this area for practical realization of benefits of the integration. This paper, however, pays particular importance to the performance improvement for the transients as is achievable by STATCOM with battery-powered storage systems. Application of STATCOM with storage in regard to intermittent renewable energy sources such as wind power generation is also discussed in the paper. At the beginning of this paper, an overall review of the STATCOM and energy storage systems are elaborated. A brief overview of the advantages of using STATCOM in conjunction to energy storage systems in achieving power system stability is presented. In the second part of the paper, a typical transient stability model of a STATCOM is presented. The dynamics of real and reactive power responses of the integrated system to transients is studied. The study is aimed at showing that the combination of STATCOM and battery energy storage significantly improves the performance of the system. The final results show that the STATCOM reactive power/voltage control helps in transient stability enhancement. 1. Introduction The principal benefit of the STATCOM for transient stability enhancement is direct through rapid bus voltage control. In particular, the STATCOM may be used to enhance power transfer during low-voltage conditions, which typically predominate during faults, decreasing the acceleration of local generators. An additional benefit is the reduction of the demagnetizing effects of faults on local generation. STATCOMs behave analogously to synchronous compensators, except that STATCOMs have no mechanical inertia and are therefore capable of responding much more rapidly to changing system conditions. When compared to synchronous machines, they do not contribute to short circuit currents and have no moving parts. However, the system has a symmetric lead-lag capability and can theoretically go from full lag to full lead in fraction of cycles [1, 2]. In Many research papers, it has been shown that an energy storage system (ESS) plays an important role in power system control. In practice, by integrating an ESS with STATCOM (STATCOM + ESS) significant improvements over traditional STATCOM performance are achievable. Some of the advantages of battery technologies are of higher energy storage densities, greater cycling capabilities, better reliability, and lower cost. This combined system is capable of mitigating majority of
Genetic Algorithms for Tuning Supplementary STATCOM Stabilizer in a Multi Machine Electric Power System  [cached]
S. Shams Shamsabad Farahani,M. Nikzad,M. Bigdeli Tabar,M. Ghasemi Naraghi
Research Journal of Applied Sciences, Engineering and Technology , 2011,
Abstract: In this study, the performance of supplementary stabilizer for static synchronous compensator (STATCOM) tuned based on genetic algorithms in order to improvement of dynamic stability is studied. Since STATCOM is usually used for damping Low Frequency Oscillations (LFO), a supplementary stabilizer is incorporated with STATCOM to reach the mentioned purpose. Genetic Algorithms (GA) as a heuristic optimization technique is used for tuning the parameters of the STATCOM supplementary stabilizer. The IEEE 14 bus test system is considered for achieving simulation results .In order to show the ability of GA-based STATCOM to damp LFO, the system responses in case with and without STATCOM are compared. Also two different operation conditions i.e. normal and heavy have been considered for better examination of GA-based STATCOM performance. Several nonlinear time-domain simulation tests visibly show the ability of STATCOM in damping of power system oscillations and consequently stability enhancement.
Using Particle Swarm Optimization Method for Supplementary STATCOM Stabilizer Tuning in Electric Power System  [cached]
M. Nikzad,S. Shams Shamsabad Farahani,M. Bigdeli Tabar,M. Ghasemi Naraghi
Research Journal of Applied Sciences, Engineering and Technology , 2011,
Abstract: In this study, the performance of supplementary stabilizer for static synchronous compensator (STATCOM) tuned based on particle swarm optimization method in order to improvement of dynamic stability is studied. Since STATCOM is usually used for damping Low Frequency Oscillations (LFO), a supplementary stabilizer is incorporated with STATCOM to reach the mentioned purpose. As a heuristic optimization technique, particle swarm optimization (PSO) is used for tuning the parameters of the STATCOM supplementary stabilizer. The IEEE 14 bus test system is considered for achieving simulation results .In order to show the ability of GA-based STATCOM to damp LFO, the system responses in case with and without STATCOM are compared. Also two different operation conditions i.e. normal and heavy have been considered for better examination of PSO-based STATCOM performance. Several nonlinear time-domain simulation tests visibly show the ability of STATCOM in damping of power system oscillations and consequently stability enhancement.
VOLTAGE STABILITY IMPROVEMENT IN POWER SYSTEM BY USING STATCOM
A.ANBARASAN,M.Y.SANAVULLAH
International Journal of Engineering Science and Technology , 2012,
Abstract: Voltage stability problems usually occur in heavily loaded systems. Nowadays the power demand increases enormously, hence in a large interconnected power system network subject to stress conditions. This situation can be handled by increasing the generation or reducing the transmission losses. When the load increases suddenly, voltage magnitude also varies beyond the permissible voltage stability limit. But the voltage magnitude must be maintained within the limit for proper operation of the system. Hence, voltage stability must be improved by providing suitable reactive power compensation. The proposed work was analyzed using IEEE 14 bus test system. The STATCOM improves the voltage stability margin of the system.
Transient Stability Improvement of Two Machine System using Fuzzy Controlled STATCOM  [PDF]
Asst.Prof Surinder Chauhan,,Asst.Prof Vikram Chopra,,Asst.Prof Shakti Singh
International Journal of Innovative Technology and Exploring Engineering , 2013,
Abstract: A static synchronous compensator is one of the FACTS devices used to improve the transient stability of the power system. In this paper a mamdani based fuzzy logic controller is designed. The inputs to the fuzzy logic are the alternator speed i.e. ω and its derivative i.e. and the output is the firing angle α of the voltage source converter. The proposed controller is tested on two machine system using Matlab Simulink Environment. The Results are compared with conventional PI STATCOM Controller.
Application of STATCOM for Transient Stability Improvement and Performance Enhancement for a Wind Turbine Based Induction Generator  [PDF]
CH.Appala Narayana,D.V.N.Ananth,K.D.Syam Prasad,CH. Saibabu
International Journal of Soft Computing & Engineering , 2013,
Abstract: Voltage stability is a key issue to achieve theuninterrupted operation of wind farms equipped with squirrel cageinduction generators (SCIG) during grid faults. A StaticSynchronous Compensator (STATCOM) is applied to a powernetwork which includes a SCIG driven by a wind turbine, for steadystate voltage regulation and transient voltage stability support. TheSTATCOM is controlled by using PQ controller technique withvoltage regulation as basic scenario. The system is implementedusing MATLAB/ SIMULINK. Results illustrate that the STATCOMimproves the transient voltage stability and therefore helps the windturbine generator system to remain in service during grid faults.The time to reach steady state torque and speed without usingvector control or direct torque control can also be achieved by usingthis STATCOM control technique.
Assessment of the Effectiveness of Two Coordinated Systems: SVC-PSS and STATCOM-PSS for Improving Transient Stability of Power System  [PDF]
Tran Thi Ngoat,Le Ngoc Giang
International Journal of Computer and Electrical Engineering , 2013, DOI: 10.7763/ijcee.2013.v5.743
Abstract: The power system stabilizer (PSS) is a control device provides a maximum power transfer and optimal power system stability. PSS has been widely used to damp electromechanical oscillations that occur in power systems due to disturbances. If no adequate damping is available, the oscillation will increase result in instability case. Shunt static var compensator (SVC) and Static Synchronous Compensator (STATCOM) is also used to improve system stability. This paper focus on the significant of SVC-PSS and STATCOMPSS to improve the transient stability of power system in various abnormal condition. This paper shows the simulation result of model for different fault condition with PSS and without PSS, with SVC and without SVC, with STATCOM and without STATCOM, and show how the Statcom and SVC help to improve the stability when PSS is fail to maintain the stability.
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