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In the present era, the power system has become a vital part to provide stability enhancement. The stability of a power system depends on how low frequency disturbances which are typically in the frequency range of 0.2 to 3.0 Hz, accurately find out and cleared so that quick restoration and maintains a stability enhancement of power is accomplished. Loss of synchronism and stability enhancement are needs to be performed using ANFIS controlled based excitation of power system [3]. The significant factors which affect the operation of power system during the occurrence of low frequency disturbances are mainly; Loss of synchronism which might be excited by the disturbances in the system or, in some cases, might even build up spontaneously. These factors can be analyzed to find out the occurrence of the low frequency disturbance in the power line operation. Various techniques like Power System Stabilizer with algorithm based or logic controlled based, UPFC has been used in past to find out and cleared the different low frequency disturbances occurred in the transmission line. The proper selection of enhanced feedback is a very tedious and time consuming task and also requires brief knowledge of the system configuration. To avoid the drawbacks of conventional power system stabilizer with algorithm or logic controller based techniques, this dissertation proposed, an efficient and robust technique of stability enhancement using ANFIS based power system excitation. The advantage of the proposed technique is that; it improves the overshoot of power and reduced the time for low frequency oscillations [1]. The ANFIS based stability enhancement accuracy of proposed technique has been verified using MATLAB/Simulink 2013(a) software. The obtained results show that the proposed technique is efficient in stability enhancement of all type of loss of synchronism and hence reliable tool for low frequency disturbance occurred in power system.
— A number of Flexible AC Transmission System (FACTS) controllers based on the rapid development of high power electronics technology have been proposed in recent years for better utilization of existing transmission facilities. FACTS devices have shown very encouraging results for improvement of power system steady state performance. Unified Power Flow Controller (UPFC) is a versatile FACTS device which has the ability to adjust the three control parameters, i.e. the bus voltage, the transmission line reactance, and the phase-angle between two buses. During transients, it can be used to improve the damping rate of low frequency oscillations. Multi-Machine (3-machines 9-Bus) electrical power system incorporated with UPFC has been simulated in the present work with the aim of analyzing the response of the device for enhancing transient stability of the electrical power system. MATLAB tool has been used for the simulation purposes. MATLAB is a new research tool which is capable of representing dynamic systems in block diagram form, along with a provision of simulation of system behavior in total. Results obtained are encouraging and indicate that the proposed simulation model is very near to the physical simulation.
There are a unit 2 forms of oscillation damping controller in grid that area unit grid stabilizer (PSS) and versatile ac transmission systems (FACTS). Numerous works are administered on the damping of grid low frequency oscillations. This paper addresses an intensive literature review on coordination drawback in single-machine and multi-machine grid. It conjointly reviews numerous forms of FACTS controllers. Numerous ways area unit projected so as to enhance the dynamic performance of an influence system for coordinated management between FACTS and PSS controller in power system models.
This paper presents a review on applications of Flexible AC Transmission Systems (FACTS) controllers such as Thyristor Controlled Reactor (TCR), Thyristor Controlled Switched Reactor (TCSR), Static Var Compensator (SVC) or Fixed Capacitor- Thyristor Controlled Reactor (FC-TCR), Thyristor Controlled Series Capacitor (TCSC), Thyristor Controlled Switched Series Reactor (TSSR), Thyristor Controlled Brakning Reactor (TCBR), Thyristor Controlled Voltage Reactor (TCVR), Thyristor Controlled Voltage Limiter (TCVL Thyristor Controlled Swiched Series (TSSC), Thyristor Controlled Phase Angle Regulator (TC-PAR) or Thyristor Controlled Phase Shift Transformer (TC-PST), Static Synchronous Series Compensator (SSSC), Static Synchronous Compensator (STATCOM), Distributed Static Synchronous Compensator (D-STATCOM), Generalized Unified Power Flow Controller (GUPFC), Unified Power Flow Controller (UPFC), Inter-link Power Flow Controller (IPFC), Generalized Inter-link Power Flow Controller (GIPFC),and Hybrid Power Flow Controller (HPFC), Semi-conductor Magnetic Energy Storage (SMES), Battery Energy Storage (BESS), in power system environments for enhancement of performance parameters of power systems such as reactive power support, minimize the real power losses, improvement in voltage profile, improvement in damping ratio of power systems, provide the flexible operation and control etc. Authors strongly believe that this survey article will be very much useful for the researchers, practitioners, and scientific engineers to find out the relevant references in the field of enhancement of performance parameters of power systems by different FACTS controllers such as series, shunt, series-shunt, and series-series connected FACTS controllers are incorporated in power systems. This article is very much useful for researchers for further research work carryout in regarding with the application of FACTS controllers in power system environments for enhancement of performance parameters of systems.
Large interconnected power systems often suffer from weakly damped swings between synchronous generators and subsystems. This paper proposes an Superconducting Magnetic Energy Storage System (SMES) based Unified Power Flow Controller(UPFC) using Fuzzy logic controller to damp tie line oscillations and improve the voltage profile under transient condition. This novel method provides active and reactive power controllability through the line. Thus the SMES based UPFC is effective in damping inter area oscillations, and the performance of device is compared with fuzzy controller against PI controller. The effectiveness of the proposed approach to modeling and simulation is implemented in Simulink environment of MATLAB. https://sites.google.com/site/ijcsis/
The growth in the demand of electrical energy is leading to load on the Power system which increases the occurrence of frequent oscillations in the system. The reason for the oscillations is due to the lack of damping torque which is required to dominate the disturbances of Power system. By using FACT devices, such as Unified Power Flow Controller (UPFC) can control power flow, reduce sub-synchronous resonances and increase transient stability. Hence, UPFC is used to damp the oscillations occurred in Power system. This research focuses on adapting the neuro fuzzy controller for the UPFC design by connecting the infinite bus (SMIB - Single machine Infinite Bus) to a linearized model of synchronous machine (Heffron-Phillips) in the power system. This model gains the capability to improve the transient stability and to damp the oscillations of the system
The International Journal of Computer Science and Information Security (IJCSIS) promotes research publications which offer a significant contribution to the computer science knowledge, and which are of high interest to a wide academic/research/practitioner audience. Coverage extends to all main-stream and state of the art branches of computer science, security and related information technology applications. As a scholarly open access peer-reviewed journal, IJCSIS mission is to provide an outlet for quality research article publications. It aims to promote universal access with equal opportunities for international scientific community; to scientific knowledge, and the creation, and dissemination of scientific and technical information. IJCSIS archives all publications in major academic/scientific databases. Indexed by the following International agencies and institutions: Google Scholar, Bielefeld Academic Search Engine (BASE), CiteSeerX, SCIRUS, Cornell’s University Library EI, Scopus, DBLP, DOI, ProQuest, EBSCO. Google Scholar reported increased in number cited papers published in IJCSIS. https://sites.google.com/site/ijcsis/Home
An adaptive Neuro-Fuzzy Inference System (ANFIS) based Flexible AC Transmission System Power Oscillation Damping controller (FACTS POD) is proposed in this paper. The controller is tuned with Genetic Algorithm (GA) for coordination with Power System Stabilizer (PSS) to damp the low frequency oscillations in power systems. The work considers PSS installation on optimum machines using (sensitivity of PSS effect) SPE approach for damping the local modes of oscillation and the ANFIS based FACTS POD is considered for damping the inter-area mode of oscillation. A hybrid learning procedure is adopted to adapt the initial fuzzy parameters of the proposed POD controller for desired damping performance. The input-output data pairs for training the adaptive network is generated by using the GA based design procedure. The proposed technique is employed for simultaneous design of PSS and FACTS POD for power oscillation damping support. The effectiveness of the proposed damping controllers is examined on the modified New-England system with Unified Power Flow Controller (UPFC) FACTS device and non-linear simulation results are presented.
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