scholarly journals Simulation of FACTS Reactive Power via Static VAR Compensator

2018 ◽  
Vol 4 (9) ◽  
pp. 18-24
Keyword(s):  
Reactive Power ◽  
Static Var Compensator

ANN-Based Relaying Algorithm for Protection of SVC- Compensated AC Transmission Line and Criticality Analysis of a Digital Relay

2020 ◽  
Vol 13 (3) ◽  
pp. 381-393
Author(s):  
Farhana Fayaz ◽  
Gobind Lal Pahuja
Keyword(s):  
Transmission Line ◽  
Failure Modes ◽  
Reactive Power ◽  
Circuit Breaker ◽  
Research Work ◽  
Back Propagation ◽  
Static Var Compensator ◽  
Data Set ◽  
Ac Transmission ◽  
Criticality Analysis

Background:The Static VAR Compensator (SVC) has the capability of improving reliability, operation and control of the transmission system thereby improving the dynamic performance of power system. SVC is a widely used shunt FACTS device, which is an important tool for the reactive power compensation in high voltage AC transmission systems. The transmission lines compensated with the SVC may experience faults and hence need a protection system against the damage caused by these faults as well as provide the uninterrupted supply of power.Methods:The research work reported in the paper is a successful attempt to reduce the time to detect faults on a SVC-compensated transmission line to less than quarter of a cycle. The relay algorithm involves two ANNs, one for detection and the other for classification of faults, including the identification of the faulted phase/phases. RMS (Root Mean Square) values of line voltages and ratios of sequence components of line currents are used as inputs to the ANNs. Extensive training and testing of the two ANNs have been carried out using the data generated by simulating an SVC-compensated transmission line in PSCAD at a signal sampling frequency of 1 kHz. Back-propagation method has been used for the training and testing. Also the criticality analysis of the existing relay and the modified relay has been done using three fault tree importance measures i.e., Fussell-Vesely (FV) Importance, Risk Achievement Worth (RAW) and Risk Reduction Worth (RRW).Results:It is found that the relay detects any type of fault occurring anywhere on the line with 100% accuracy within a short time of 4 ms. It also classifies the type of the fault and indicates the faulted phase or phases, as the case may be, with 100% accuracy within 15 ms, that is well before a circuit breaker can clear the fault. As demonstrated, fault detection and classification by the use of ANNs is reliable and accurate when a large data set is available for training. The results from the criticality analysis show that the criticality ranking varies in both the designs (existing relay and the existing modified relay) and the ranking of the improved measurement system in the modified relay changes from 2 to 4.Conclusion:A relaying algorithm is proposed for the protection of transmission line compensated with Static Var Compensator (SVC) and criticality ranking of different failure modes of a digital relay is carried out. The proposed scheme has significant advantages over more traditional relaying algorithms. It is suitable for high resistance faults and is not affected by the inception angle nor by the location of fault.

Reactive Power Compensation for Unbalanced Fluctuating Loads by Using Two-Dimensional Space Vector and a Static Var Compensator

2014 ◽  
Vol 533 ◽  
pp. 397-400 ◽  
Author(s):  
Chi Jui Wu ◽  
Yu Wei Liu ◽  
Shou Chien Huang
Keyword(s):  
Power Factor ◽  
Reactive Power ◽  
Dimensional Space ◽  
Measurement Data ◽  
Power Source ◽  
Active Power ◽  
Two Dimensional ◽  
Static Var Compensator ◽  
Space Vector ◽  
Three Phase

To modify the power factor and balance the three-phase currents simultaneously, this paper proposes the instantaneous compensator to calculate the compensation current. The instantaneous compensator utilizes two-dimensional instantaneous space vector and setting the active power as a constant for each cycle which can improve power quality effectively. Moreover, the instantaneous compensator requires an independent power source, whose capacity can be reduce by using a static var compensator (SVC). An SVC does not interfere with the capability of the instantaneous compensator. Field measurement data were analyzed. Simulation results confirmed the feasibility of correcting the power factor and balancing load currents simultaneously using the proposed method.

Designing Static VAr Compensator capacity to enhance power quality in electric arc furnaces

SIMULATION ◽  
2017 ◽  
Vol 93 (6) ◽  
pp. 515-525 ◽  
Author(s):  
Mohammad Reza Asban ◽  
Jamshid Aghaei ◽  
Taher Niknam ◽  
Mohammad Amin Akbari
Keyword(s):  
Power Factor ◽  
Reactive Power ◽  
Electric Arc ◽  
Active Power ◽  
Static Var Compensator ◽  
Power Functions ◽  
Voltage Fluctuations ◽  
Electric Arc Furnaces ◽  
Arc Furnaces ◽  
Electro Magnetic

This paper introduces a method for reducing damages arising from voltage fluctuations, voltage flicker, imbalance in the three-phase and power factor reduction caused by electric arc furnaces. A novel equation is defined to calculate the susceptance values of the static var compensator control system, the active power functions of phase load as well as the reactive power ones that have been used to suppress the voltage fluctuation. By compensating the impulsive part of active power component in the impulsive loads, not only can we reduce voltage fluctuations, flicker effects, balance the system and increase the power factor, but also voltage stabilization can be directly controlled. By studying this method and simulating on Electro-Magnetic Transients Program (EMTP) software, we can see that, according to the allowable flicker limit, a compensation method can balance the system, increase power factor and resolve the problem of voltage fluctuations and flicker.

scholarly journals Hybrid control strategies of SVC for reactive power compensation

2020 ◽  
Vol 19 (2) ◽  
pp. 563
Author(s):  
Mothanna Sh. Aziz ◽  
Ahmed G. Abdullah
Keyword(s):  
Reactive Power ◽  
Hybrid Control ◽  
Control Strategies ◽  
Hybrid Genetic Algorithm ◽  
Static Var Compensator ◽  
Flexible Ac Transmission ◽  
Flexible Ac Transmission System ◽  
Dynamic Voltage ◽  
Bus Voltage ◽  
Ac Transmission

<span>This article shows a prospective utilizations of flexible AC transmission system (FACTS) controls, like the static VAR compensator (SVC). One of the major motives for setting up an SVC is to recover dynamic voltage controller and thus increase system load aptitude. Static VAR compensator system proposed in this work consists of thyristor switched capacitor and thyristor controlled reactor sets, this style of SVC modelled using MATLAB simulink toolbox. A hybrid genetic algorithm with PI and fuzzy logic controls that used to control and expand the grid performance of the power system. The model results reveal that the Static Var Compensation contribute a decent result in upholding bus voltage after the power network is in an active and steady moment, besides it has a capability of the constancy control. It can totally work as a significant plan of reactive power recompense in power networks. </span>

Reducing Voltage Fluctuations in Wind Turbines by SVC Method

2016 ◽  
Vol 850 ◽  
pp. 166-171
Author(s):  
Amir Jahi ◽  
S.S. Tezcan
Keyword(s):  
Power Systems ◽  
Power Quality ◽  
Wind Turbines ◽  
Reactive Power ◽  
Voltage Characteristic ◽  
Wind Generation ◽  
Static Var Compensator ◽  
Voltage Fluctuations ◽  
Power Regulation

Today because of increasing wind generation in the power systems, voltage variations are critical in power quality of grid combination of wind energy. This paper presents a Static Var Compensator (SVC) as an efficient choice for the reactive power regulation of wind turbines to decrease voltage fluctuations, and the proposed modulation is performed for the cases with and without SVC. The simulation showed the effective influences of the SVC on the voltage characteristic with the unexpected changes in the voltage magnitude.

The Modeling of SVC for the Voltage Control in Power System

2017 ◽  
Vol 6 (3) ◽  
pp. 513 ◽  
Author(s):  
Nor Adni Binti Mat Le ◽  
W Mohd Nazmi bin W Musa ◽  
Nurlida Binti Ismail ◽  
Nurul Huda binti Ishak ◽  
Nur Ashida binti Salim
Keyword(s):  
Power System ◽  
Reactive Power ◽  
Voltage Control ◽  
Load Flow ◽  
Static Var Compensator ◽  
Voltage Instability ◽  
Newton Raphson ◽  
Simulation Results ◽  
Power Limit ◽  
Raphson Method

One of the major causes of voltage instability in power system is the reactive power limit. Therefore, this paper aims to analyze the effect of Static Var Compensator (SVC) on voltage stability of a power system. There are many ways to control the voltage, but in this paper only focus on the SVC and IEEE-9 buses. The SVC circuit and IEEE-9 buses were designed and modelled in Power World. The Newton Raphson method was applied to compute the load flow solution. Then, the reactive power (Q) was injected to SVC and the effect of SVC on IEEE 9-buses were studied. The analysis of voltage control was considered the conditions of fault occurred at the bus. The simulation results obtained in Power World demonstrate that the improvement voltage in the IEEE 9-buses when the Q was injected into SVC circuit. Besides, the QV curve was plotted to show the sensitivity and variation bus voltages with respect to the Q injection.

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