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2013
Low Frequency Oscillations (LFO) occur in power systems because of lack of the damping torque in order to dominance to power system disturbances as an example of change in mechanical input power. Traditionally, power system stabilizers (PSS) are being used to damp these oscillations. Unified Power Flow Controller (UPFC) is a well-known FACTS device that can control power flow in transmission lines. It can also replace PSS to damp low frequency oscillations effectively through direct control of voltage and power. In this paper a liberalized Philips-Heffron model of a (Single Machine-Infinite Bus) power system with a unified power flow controller is considered and also in order to damp LFO, adaptive neuro-fuzzy controller for UPFC is designed and simulated. Simulation is performed for various types of loads and for different disturbances. Simulation results show good performance of neuro-fuzzy controller in damping LFO. Keywords- Neuro-Fuzzy Controller, Low Frequency,Oscillations (LFO...
2008 •
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
Abstract: - Low Frequency Oscillations (LFO) occur in power systems because of lack of the damping torque in order to dominance to power system disturbances as an example of change in mechanical input power. In the recent past Power System Stabilizer (PSS) was used to damp LFO. FACTs devices, such as Unified Power Flow Controller (UPFC), can control power flow, reduce sub-synchronous resonance and increase transient stability. So UPFC may be used to damp LFO instead of PSS. UPFC damps LFO through direct control of voltage and power. In this paper the linearized model of synchronous machine (Heffron-Philips) connected to infinite bus (Single Machine-Infinite Bus: SMIB) with UPFC is used and also in order to damp LFO, adaptive neuro-fuzzy controller for UPFC is designed and simulated. Simulation is performed for various types of loads and for different disturbances. Simulation results show good performance of neuro-fuzzy controller in damping LFO.
2018 •
In this paper we are describing about the recently transmission network reason the power system to be complex and stressed out. Due to the stress in the power system there is a chance of down the stability during the fault. Power system over the globally become complex every day. we have continues requirement of secured, stable, economic, controlled and better quality of power. When the fault occurs in the power system the whole system goes to severe transients. By using FACTS device like UPFC we can easily stabilize the system, suppress the power system oscillations and control active and reactive power also of the system. UPFC is mount in a singlemachine infinite bus system to suppress low frequency oscillations. In it we analysis the behavior of power system with hybrid fuzzy logic –PID based UPFC. And simulate the model of UPFC based hybrid PIDFUZZY logic controller and UPFC connected SMIB system. This is very much useful to control power flow as well as damping out the swing of...
International Journal of Advanced Research in Electrical, Electronics and Instrumentation Energy
Fuzzy Based Upfc Control Forpower Frequency Oscillations2013 •
This paper presents the optimization and coordination of the conventional FACTs device (i.e. Unified Power Flow Controller) damping controller in multi-machine power system. The design of this controller is based on time-domain analysis and implemented by using other conventional controllers (PSS & FUZZY) to damp low frequency electromechanical (iner-area) power oscillations. The detailed design procedure of UPFC controller is first addressed. Firstly, the parameters of unified power flow controller are optimized, and then a PSS & Hybrid Fuzzy logic controller for the coordination with Facts devices is presented. Digital simulations are then carried out to verify the feasibility of the proposed control scheme. The simulation done on the IEEE multi-machine power system with 12-bus and results are shows that the proposed damping method is implementable and UPFC based Fuzzy system providing the satisfactory performance than other conventional controllers and meeting the design objectives.
2009 •
Sustainability
Application of Neuro-Fuzzy Controller to Replace SMIB and Interconnected Multi-Machine Power System Stabilizers2020 •
In this research, an effective application and performance assessment of the Neuro-Fuzzy Controller (NFC) damping controller is designed to replace a single machine infinite bus (SMIB) power system stabilizer (PSS), and coordinated multi PSSs in large interconnected power systems are presented. The limitation of the conventional PSSs on SMIB and interconnected multi-machine test power systems are exposed and disclosed by the proposed NFC stabilizer. The NFC is a nonlinear robust controller which does not require a mathematical model of the test power system to be controlled, unlike the conventional PSSs’ damping controller. The Proposed NFC is designed to improve the stability of SMIB, an interconnected IEEE 3-machine, 9-bus power system, and an interconnected two-area 10-machine system of 39-bus New England IEEE test power system under multiple operating conditions. The proposed NFC damping controller performance is compared with the conventional PSS damping controller to confirm t...
International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering
Transient Stability Enhancement of SMIB System with Fuzzy Based PSS Controller and UPFC Using MATLAB Simulink2016 •
Unified Power Flow Controller (UPFC) is the greatest multipurpose Flexible AC Transmission System (FACTS) scheme due to its capacity to control real and reactive power on transmission lines and adjusting the voltage of the bus to which it is attached. It is compulsory to analyze its effect of UPFC on power system network when the fault occurs in the power system and therefore whole system goes to severe transients. By using PSS and AVR we can simply stabilize the system. FACTS devices like TCSC, SVC, STATCOM, and UPFC are important device to suppress the power system oscillations under faults occurrence and enhance the damping of the system. The power electronic devicetermed as UPFC which efficiently control the active and reactive power. To carry out small signal stability analysis with the proposed method, a SMIB linear model of Philip-Heffron model, a recognized model for synchronous generator has been employed. Recent past has witnessed the advancements of Power System Stabilizers (PSS) and their variants for enhancing the stability of power system. But the added advantages of FACTS based design outperformed PSS in terms of performance and implementation perspective. The simulation results show that PSS and FL based PSS improves the stability of the SMIB scheme and power system fluctuations are successfully damped out. The unified power flow controller (UPFC) has various applications together with loop flow control, power flow control load sharing among parallel passages, modification of system oscillations, and voltage (reactive power) regulation and development of transient stability. In this thesis, MATLAB simulation package is employed to simulate the UPFC model. A fuzzy logic controller as power system stabilizer is used Power system stabilizers (PSSs) is additional to excitation scheme or controller loop of the generating unit to improve the damping through low frequency oscillations. A three phase fault is considered. The studies are carried out with and without fault consideration in SMIB system. SMIB system with and without UPFC controller is proposed and comparisons are made to show the effectiveness of UPFC controller for the enhancement of transient stability of SMIB system
The Power disturbances in the transmission line are to be controlled and reduced by using UPFC. Unified Power Flow Controller were the complex power electronic equipment for the control and optimization of power flow in electrical power transmission system in transmission lines. In this project, controlling the power flow and reducing the power oscillation damping losses (Reactive power) flow through a transmission lines with the use of UPFC. Adaptive Neuro-fuzzy controllers were used to control the UPFC system. The Adaptive Neuro-fuzzy controllers were used to generate the pulse signal. The pulse width modulation is used in the Neuro-fuzzy controller to produce the sinusoidal pulse signal. Designing the simulation using MATLAB Simulink is done and the controller of the UPFC is studied. In the UPFC system in transmission lines can be controlling the parameters using control systems, it is observed that whenever the source some real power into the transmission lines it is manifested as a voltage drop across the DC link. Reactive power demand is indicated in the bus bar AC voltage transmission lines. The fall of the DC link voltage is an indication of real power demand from the receiving end. Similarly a fall of the bus bar AC voltage is an indication of Reactive power demand from the receiving end. Simpower system toolbox is used in this works in the control of voltage and Power transfer.
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