A multi-machine power system with a TCSC device

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Application of Fuzzy Controlled TCSC in Multi Machine Power system for Transient Stability Improvement

Application of Fuzzy Controlled TCSC in Multi Machine Power system for Transient Stability Improvement

Karimnagar, AP, India. ABSTRACT For the improvement of transient stability the general methods adopted are fast acting exciters, circuit breakers and reduction in system transfer reactance. The modern trend is to employ FACTS devices in the existing system for effective utilization of existing transmission resources. These FACTS devices contribute to power flow improvement besides they extend their services in transient stability improvement as well in this paper, the work had been carried out in order to improve the Transient Stability of WSCC 9 Bus System with Fixed Compensation on Various Lines and Optimal Location has been investigated using trajectory sensitivity analysis for better results. In order to improve the Transient Stability margin further series FACTS device has been implemented. A fuzzy controlled Thyristor Controlled Series Compensation (TCSC) device has been used here and the results highlight the effectiveness of the application of a TCSC in improving the transient stability of a power system.
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Comparison of SVC and TCSC for Transient Stability Enhancement of Multi-machine System

Comparison of SVC and TCSC for Transient Stability Enhancement of Multi-machine System

An estimation of TSA has been used to study the effects of series & shunt FACTS devices on the transient stability. The modeling and optimal tuning of various FACTS devices for a dynamic stability enhancement of multi machine power systems is studied. The efficacy of SVC and TCSC controller in improving voltage stability and total transfer capacity using multi-objective GA was investigated. Modeling and interfacing techniques for SVC and TCSC for a long term dynamic simulation was studied. This paper presents the placement of SVC and TCSC controller at their optimal position in IEEE 3 machine 9 bus power system. The paper also investigates the comparison of both controllers in improving transient stability enhancement.
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POWER SYSTEM STABILITY BY USING TCSC

POWER SYSTEM STABILITY BY USING TCSC

Keywords -Transient Stability, Tripping Off, FACTS , TCSC, Mi Power Software I. INTRODUCTION The main aim of the paper is to maintain system stability using Thyristor Controlled Series Capacitor. The reason of using TCSC Thyristor Controlled Series capacitor (TCSC) is a power electronics based Flexible AC Transmission System (FACTS) device. TCSCs are used to enhance the power flowing in a line by effectively compensating the reactance of the line. The difference between a conventional series capacitor and a TCSC is that a TCSC can dynamically vary its compensation whereas a conventional series capacitor has a fixed compensation. The basic conceptual TCSC module comprises a conventional fixed series capacitor, C1, a fixed capacitor in parallel, C2, with a thyristor-controlled reactor, L, as shown in Fig 1.1. However, a practical TCSC module also includes protective equipment.
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Power Stability of Multi Machine System

Power Stability of Multi Machine System

M.Tech Student, Department of EEE, BRCM College of Engineering, Behal, Bhiwani Haryana, India Asst. Professor, Department of EEE, BRCM College of Engineering, Behal, Bhiwani Haryana, India ABSTRACT: The stability of an interconnected power system is its ability to return to normal or stable operation after having been subjected to some form of disturbance. With interconnected systems continually growing in size and extending over vast geographical regions, it is becoming increasingly more difficult to maintain synchronism between various parts of the power system. In this paper we will study the various types of stability for multi machine system - steady state stability, transient state stability and the swing equation and its solution using numerical methods using MATLAB. Modern power systems have many interconnected generating stations, each with several generators and many loads. So we have presented multi-machine system and its stability has been analyzed using illustration and various fault and provided solution to the fault too.
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Analysis of Power Flow Control in Power System using Thyristor controlled series capacitor Device (TCSC): A Review

Analysis of Power Flow Control in Power System using Thyristor controlled series capacitor Device (TCSC): A Review

M.tech Scholar 1 , Asst Professor EX Department, REC Bhopal Abstract— The world's electric power supply systems are widely interconnected. We need these interconnections because, apart from delivery, the purpose of the transmission network is to pool power plants and load centre in order to minimize the total power generation capacity and fuel cost. Today’s power system demand have been increase with loads, it is more difficult to provide stability and control. In this paper analysis of power flow control in power system using Thyristor controlled series compensation and performance of TCSC is given. FACTS technology new opportunities for controlling power and enhancing the usable capacity of present, as well as new and upgraded lines. In this paper the study of TCSC with capacitive
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Analysis of Power Flow Control in Power System using Thyristor controlled series capacitor Device (TCSC): A Review

Analysis of Power Flow Control in Power System using Thyristor controlled series capacitor Device (TCSC): A Review

Abstract— The world's electric power supply systems are widely interconnected. We need these interconnections because, apart from delivery, the purpose of the transmission network is to pool power plants and load centre in order to minimize the total power generation capacity and fuel cost. Today’s power system demand have been increase with loads, it is more difficult to provide stability and control. In this paper analysis of power flow control in power system using Thyristor controlled series compensation and performance of TCSC is given. FACTS technology new opportunities for controlling power and enhancing the usable capacity of present, as well as new and upgraded lines. In this paper the study of TCSC with capacitive
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Analysis of Single and Multi Resonance Point in Reactance Characteristics of TCSC Device

Analysis of Single and Multi Resonance Point in Reactance Characteristics of TCSC Device

3.ANALYSIS OF SINGLE RESONANT POINT REACTANCE CHARATCRISTICS For a practical TCSC, the compensation capacitance depends on the requirement of power system in which the TCSC is installed. Once the capacitance of compensation capacitor is fixed, the main factor influencing resonant point of TCSC is the reactance X L . To verify this theoretical analysis, the simulation has been done in Scilab by considering Kanpur- Ballabhgarh TCSC capacitor; C=306 µF and for different values of inductance.

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Contingency Analysis in 14-Bus Power System with TCSC

Contingency Analysis in 14-Bus Power System with TCSC

Professor, Dept. of EEE, Qis College of Engineering & Technology, Ongole, A.P, India 2 ABSTRACT: Power system security is one of challenging task for the power system engineers. Contingency analysis is being widely used to predict the effect of outages like failures of transmission lines and generator etc. Contingency analysis is a computer application that uses a simulated model of the power system to evaluate the effects and to calculate any overloads. A FACT device TCSC can be alternative to reduce overloads and increasing line load ability, to reduce the system loss, to improve stability of power system network. This paper shows a 14-bus power system which gives the information of violations and novel method proposed
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Multi-machine Power System Robust Excitation Control

Multi-machine Power System Robust Excitation Control

Keywords: Multi-machine power system; Excitation control; Robust control; PID; PSS 1. Introduction Recent years, with power systems increasingly operated closer to their transfer power limits, the dynamic response of stressed power systems under critical contingencies may result in complex nonlinear dynamic phenomenon, several modes of inter area oscillation have been identified. In addition, operating conditions of modern large-scale power systems are continuously varying in order to satisfy different load demands. As a result, control systems are required to enhance the system’s transient stability. The transient stability is concerned with a power system ability to reach an acceptable steady-state behaviour while loading demand change or after a major contingency occurs. The power system stabilizer (PSS) is usually regarded as an effective means to damp out the oscillations while improve the dynamic stability of the power systems.
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Assessment of PSO Algorithm For Multi machine System Using STATCOM Device

Assessment of PSO Algorithm For Multi machine System Using STATCOM Device

Transient stability of power systems becomes a major factor in planning and day-to-day operations and there is a need for fast on-line solution of transient stability to predict any possible loss of synchronism and to take the necessary measures to restore stability. Recently various controller devices are designed to damp these oscillations and to improve the system stability, which are found in modern power systems, but static synchronous compensator (STATCOM) still remains an attractive solution. These STATCOM are local controllers on the generators. Thus local controllers are used to mitigate system oscillation modes. In multi machine system with several poorly damped modes of oscillations, several controllers have to be used and the problem of synthesis of STATCOM parameters becomes relatively complicated. Population based optimization techniques have been applied for STATCOM design. Studies have revealed that these optimization techniques have improved the system stability. A population based algorithm called Particle Swarm Optimization (PSO) has been proposed in this thesis for optimal tuning of the static synchronous series compensator (STATCOM) for a single machine infinite bus (SMIB) system. Recent studies in artificial intelligence demonstrated that the Particle Swarm optimization technique is a powerful intelligent tool for complicated stability problems. This algorithm is based on behavior of swarm intelligence occur in nature like flocking birds tend to form swarming patterns. The STATCOM parameters of an SMIB system and 3 machine system are tuned to improve small signal stability and large signal stability. It is relevant from the results that the proposed PSO algorithm is superior to any conventional technique.
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Performance comparison of TCSC with TCPS and SSSC controllers in AGC of realistic interconnected multi-source power system

Performance comparison of TCSC with TCPS and SSSC controllers in AGC of realistic interconnected multi-source power system

Briefly, the frequency stability is enhanced outstandingly by using the TCSC–AGC. 3.4. Performance evaluation for pulse load perturbation In this item, a pulse load perturbation with period of 40 s and amplitude of 0.01 P.U. is applied in area 1. The area frequen- cies and tie-line power oscillation responses are shown in Fig. 6. It can be seen that by employing just AGC, the ampli- tude of the deviations grow larger consecutively which may bring about system instability. However, owing to the superi- ority of proposed TCSC–AGC controller in comparison with the SSSC–AGC and TCPS–AGC, the oscillations are miti- gated appropriately even with the applied pulse perturbation.
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Optimization of SMES and TCSC using particle swarm optimization for oscillation mitigation in a multi machines power system

Optimization of SMES and TCSC using particle swarm optimization for oscillation mitigation in a multi machines power system

Due to the uncertainty of load demand, the stability of power system becomes more insecure. Small signal stability or low- frequency oscillation is one of stability issues which correspond to power transmission between interconnected power systems. To enhance the small signal stability, an additional controller such as energy storage and flexible AC transmission system (FACTS) devices become inevitable. This paper investigates the application of superconducting magnetic energy storage (SMES) and thyristor controlled series compensator (TCSC) to mitigate oscillation in a power system. To get the best parameter values of SMES and TCSC, particle swarm optimization (PSO) is used. The performance of the power system equipped with SMES and TCSC was analyzed through time domain simulations. Three machines (whose power ratings are 71.641, 163, and 85 MW) nine buses power system was used for simulation. From the simulation results, it is concluded that SMES and TCSC can mitigate oscillatory condition on the power system especially in lowering the maximum overshoot up to 0.005 pu in this case. It was also approved that PSO can be used to obtain the optimal parameter of SMES and TCSC.
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Neuro-fuzzy based power system stabilizer of a multi-machine system

Neuro-fuzzy based power system stabilizer of a multi-machine system

External factors, such as lightning, can also cause disturbances to the power system. All these disturbances are termed as faults. When a fault occurs, it causes the motor to lose synchronism if the natural frequency of oscillation coincides with the frequency of oscillation on the generators. With these factors in mind, the basic condition for a power system with stability is synchronism. Besides this condition, there are other important condition such as steady-state stability, transient stability, harmonics and disturbance, collapse of voltage and the loss of reactive power [2].
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Power Quality Improvement in A Multi Machine System using a STATCOM

Power Quality Improvement in A Multi Machine System using a STATCOM

17 operation, all the fluctuation in the wind speed are transmitted as fluctuations in the mechanical torque, electrical power on the grid and leads to large voltage fluctuations. During the normal operation, wind turbine produces a continuous variable output power. These power variations are mainly caused by the effect of turbulence, wind shear, and tower-shadow and of control system in the power system. Thus, the network needs to manage for such fluctuations. The power quality issues can be viewed with respect to the wind generation, transmission and distribution network, such as voltage sag, swells, flickers, harmonics etc. However the wind generator introduces disturbances into the distribution network. One of the simple methods of running a wind generating system is to use the induction generator connected directly to the grid system. The induction generator has inherent advantages of cost effectiveness and robustness. However induction generators require reactive power for magnetization. When the generated active power of an induction generator is varied due to wind, absorbed reactive power and terminal voltage of an induction generator can be significantly affected. A proper control scheme in wind energy generation system is required under normal operating condition to allow the proper control over the active power production. In the event of increasing grid disturbance, a battery energy storage system for wind energy generating system is generally required to compensate the fluctuation generated by wind turbine. A STATCOM- based control technology has been proposed for improving the power quality which can technically manages the power level associates with the commercial wind turbines. The standard norms are specified:
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Improvement of Multi Machine Power System Stability Using SSSC

Improvement of Multi Machine Power System Stability Using SSSC

Abhinav L. Purkar 1 , Prof. Prasanna D Bharadwaj 2 1 P.G. Student, 2 Associate Professor, Department of Electrical Engineering Bharati Vidyapeeth Deemed University College of Engineering, Pune, India. Abstract- Power systems have ability to come back to normal operation after some types of disturbances which is termed as system stability. Instability is a loss of synchronism. From a very long time, Stability has been an important factor in power system planning. To maintain such synchronism is more difficult as a system is increasing by size and expanding over a large geographical area. A FACTS device has given satisfactory results when put in the system to enhance the overall performance of power system. They have been very useful for damping the oscillations in a power system. Various problems related to control stability of the system will be elucidated by introducing FACTS controllers in the system. Within the Paper, author has done analysis and investigation to compliment the transient stability in Two-machine systems by correct implementation of SSSC.In a MATLAB software, a complete simulation of two machine system with the inclusion of a SSSC is done by using various power system blocks. As per the result that we get from simulation after applying unsymmetrical faults, Voltage stability has been improved by implementing SSSC in the system.
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Heuristic technique for optimal power flow in a Power system using facts controller (TCSC)

Heuristic technique for optimal power flow in a Power system using facts controller (TCSC)

with different objective functions is presented in this paper. The different objective functions include fuel cost minimization and active power loss minimization. This is achieved using Genetic Algorithm (GA), a heuristic technique proved to be efficient and widely used. The optimal settings of the power system are determined with fuel cost minimization as objective function using basic optimal power flow solution. Active power loss has been taken as objective function for reactive power optimization. The fuel cost minimization and active power loss minimization are taken as objective functions with Thyristor Controlled Series Compensator (TCSC) device by OPF solution. The total fuel cost and active power loss are minimized using TCSC and the results are compared to the values that are obtained without TCSC. The Genetic Algorithm is applied to study all the above cases.
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Power Flow Control in Power System using Thyristor Controlled Series Capacitor (TCSC)

Power Flow Control in Power System using Thyristor Controlled Series Capacitor (TCSC)

ABSTRACT In modern times, due to the increasing demand for energy as the transmission network expands, the transmission line must operate under a loaded condition and there is a risk of current drain control and voltage instability. This document proposes the control of energy in a network of power supply systems by including TCSC and SVC devices. The TCSC is a series compensated device to reduce the reactance of the transmission line to improve the current through it, while the SVC is a bypass compensated device and improves the voltage profile. This article presents a systematic procedure for modeling and simulation with MATLAB / SIMULINK (set of blockers for the Simpower system). The optimal location of the TCSC and SVC device is considered for the control of the power flow and the voltage stability limit. The proposed approach is implemented in an 11-state test system model of four two-state machines and the simulated result is presented to validate the proposed test case system. In this paper performance of TCSC and SVC, the device is analyzed and compared with the simulated result for better control of the power flow in the power system.
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Optimization of Power System Stabilizer for Multi Machine Power System using Invasive Weed Optimization Algorithm

Optimization of Power System Stabilizer for Multi Machine Power System using Invasive Weed Optimization Algorithm

(3) Where, Δω i and U pssi are the deviation of synchronous speed and the stabilizer control signal which is added to the excitation system reference. The signal washout block time constant T wi allows the signal associated with oscillations in rotor speed to pass unchanged, and restricts the steady state changes to modify the terminal voltages. From the view of the washout function, the value of Tw is generally not critical and may be in the range of 0.5 to 20 seconds [23]. In this paper, it is fixed to 10s. The phase compensation block with time constants T 1 , T 2 and T 3 , T 4 supplies the required phase-lead to compensate for the phase lag between input and the output signals. The five PSS parameters consisting of the four time constants T 1 to T 4 and the gain K pss need to be optimally chosen for each generator to guarantee optimal system performance under various system configurations and system loadings to ensure the robustness of the technique.
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TCSC Control of Power System oscillation and Analysis using Eigenvalue Techniques

TCSC Control of Power System oscillation and Analysis using Eigenvalue Techniques

C ONCLUSION This paper has reviewed methods for analysis and control of power system oscillations with TCSC device based on the eigenstructure of the state matrix of the linear model of the power system. Residue-based methods also provide valuable informat ion on how to design power system damping controllers. Although eigenvalue based methods are very powerful, the co mple xity of the power system stability problem requires the comple mentary use of other methods such as non-linear time do ma in simulation. A ll the simu lations were done with PST toolbo x in Matlab environment.
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Dynamic Modeling and Damping Function of GUPFC in Multi-Machine Power System

Dynamic Modeling and Damping Function of GUPFC in Multi-Machine Power System

Dynamic Modeling and Damping Function of GUPFC in Multi-Machine Power System Sasongko Pramono Hadi 1 Abstract  This paper presents a new dynamic model of multi-machine power system equipped with GUPFC for power system study, and using PSS and GUPFC POD controller some effective control schemes are proposed to improve power system stability. Based on UPFC configuration, an additional series boosting transformer is considered to define a GUPFC configuration and its mathematical model; Phillips-Heffron scheme is used to formulate machine model, and modification of network dealing with GUPFC parameter is carried out to develop a MIMO as well as comprehensive power system with GUPFC model. Genetics Algorithm method was proposed to lead-lag compensation design, this technique provides the parameter controller. The controller produced supplementary signals, the PSS for machine and POD for GUPFC. By applying a small disturbance, the dynamic stability power system was investigated. Simulation results show that the proposed power system with GUPFC model is valid and suitable for stability analysis. The installation of GUPFC without POD decreased the damping oscillation. But, the results show that the presence of GUPFC in power system network provided by PSS and POD controller is very potential to improve system stability. A 66% overshoot reduction could be reached, it is obtained 12 s in settling time (shorter), although the rise time become 700 ms longer. Simulation results revealed that the role of POD controller is more dominant than the PSS, however both PSS and GUPFC POD controller simultaneously present a positive interaction. Phase angle of converter C, δ C is the most significant control signal POD in oscillation damping.
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