scholarly journals Experimental Research on Performance Analysis of a UPFC Damping Controller

2019 ◽  
Vol 8 (2S11) ◽  
pp. 3261-3266
Keyword(s):  
Power System ◽  
Power Flow ◽  
Harmonic Distortion ◽  
Stability Limit ◽  
Simulation Models ◽  
Voltage Source ◽  
Theoretical Derivation ◽  
Voltage Unbalance ◽  
Three Phase ◽  
Ac Transmission

The unified power quality conditioner is equipment used for regulated voltage distortion and voltage unbalance in a power system. This device gives unique control on the power flow and voltage stability in the transmission line within their limits and enhancing the power to flow through the preferred path. This paper presents a control scheme and Theoretical derivation of the unified power flow conditioner and the simulation results are compared and contrasted in detail. UPFC is a combination of shunt Active and series active power filters. UPFC contains a DC link capacitor in a single phase voltage source inverter with two back to back connected, three-phase three-wire and three-phase four-wire are arranged. The objective of the study is to introduce a scheme which improves the quality of power in the flexible AC transmission systems on the aspects of voltage sag and harmonic distortion apart from enhancing power transfer capability and stability limit using unified power flow conditioner In this, the power system simulation models are made on MATLAB version. The results obtained show that the UPFC controller had better performance to damp LFO compared to the other UPFC damping controllers.

scholarly journals Harmonic interaction of a static Var compensator with AC power system containing multiple non-linear loads

2020 ◽  
Vol 40 (3) ◽  
pp. 21-31
Author(s):  
Mohamed Nassim Kraimia ◽  
Mohamed Boudour
Keyword(s):  
Power System ◽  
Power Flow ◽  
Fourier Transforms ◽  
Current Source ◽  
Harmonic Distortion ◽  
Static Var Compensator ◽  
Nonlinear Loads ◽  
Compensating Devices ◽  
Ac Transmission ◽  
The Impact

In this paper a study of the impact of the harmonics generated by a static Var compensator (SVC) is presented. The SVC is modeled, in the harmonic domain, as a coupled current source by using the complex Fourier transforms. Then, this model is converted to polar form to be integrated into the harmonic power flow program. This approach has been carried out on the IEEE 14 bus test power system, in order to show its effectiveness in evaluating the impact of harmonics, injected by the shunt compensating devices, and its interaction with the AC transmission system, in meshed power networks. Since the SVC consists of a thyristorcontrolled reactor (TCR) and a fixed capacitor, the harmonic currents are functions of the TCR thyristors firing angles. The variation of the total voltage harmonic distortion as function of firing angle changes and location of nonlinear loads is clearly presented and discussed.

A Novel Faulty Phase Identification Algorithm and Fast DQ Transform Technique for Voltage Sag Detection

2017 ◽  
Vol 26 (12) ◽  
pp. 1750204 ◽  
Author(s):  
S. Rashmi ◽  
Shankaraiah
Keyword(s):  
Power System ◽  
Power Flow ◽  
Voltage Sag ◽  
Phase Identification ◽  
Identification Algorithm ◽  
Two Phase ◽  
Three Phase ◽  
Voltage Sag Detection ◽  
A New Technique ◽  
Ac Transmission

The disturbances created in AC transmission line power flow due to various faults and unavoidable natural circumstances have to be monitored carefully for uninterrupted power supply to the consumer and to avoid unacceptable situations. Voltage sag is one such unwanted disturbance occurring in the power system due to varying causes like lightning, loose connections, accidental short circuits, tree branches touching the line, birds hitting the line, etc., owing to non-recoverable damage to sensitive equipment in industries which also leads to financial losses. This paper proposes a new technique using DQ transform and integrator for fast voltage sag detection which is possible within [Formula: see text]th of a cycle and a new algorithm to identify the faulty phase. The authors are able to detect the voltage sag within the lowest time of 0.3[Formula: see text]ms for single-phase fault and 0.2[Formula: see text]ms for two-phase and three-phase faults. The simulation results for various types of power system faults with different point-on-waveform (POW) are presented using MATLAB/Simulink tool.

scholarly journals Impact of voltage unbalance on the performance of three-phase induction motor

2006 ◽  
Vol 24 (1) ◽  
pp. 45 ◽  
Author(s):  
P Giridhar Kini ◽  
R C Bansal ◽  
R S Aithal
Keyword(s):  
Power System ◽  
Induction Motor ◽  
Process Industries ◽  
Voltage Unbalance ◽  
Voltage Variation ◽  
Three Phase ◽  
Generating Capacity ◽  
Working Performance ◽  
Performance Variations

Availability of quality power has become an important issue for industrial utilities due to frequent performance variations in process industries. Increase in the generating capacity has not kept up pace of power demand, which results into shortage of power supply and power system network is normally subjected to varying and unequal loads across the three phases. Continuous variation of single-phase loads on the power system network leads to voltage variation and unbalance, most importantly; the three-phase voltages tend to become asymmetrical in nature. Application of asymmetrical voltages to induction motor driven systems severely affects its working performance. This paper presents the effects of voltage variation and unbalance on the performance of an induction motor driven centrifugal pump with a case study.

Study of Shunt FACTS-Based Controllers Effectiveness on Multi Machine Power System Steady State Operation

2011 ◽  
Vol 403-408 ◽  
pp. 4926-4933
Author(s):  
Laxmidhar Sahu ◽  
Jose. P. Therattil ◽  
P. C. Panda
Keyword(s):  
Power System ◽  
Power Flow ◽  
Load Flow ◽  
Continuous Change ◽  
Flow Models ◽  
Flexible Ac Transmission ◽  
Steady State Operation ◽  
Facts Controllers ◽  
Ac Transmission ◽  
Matlab Programming

The continuous change in power demand and supply altered the power flow patterns in transmission networks in such a way that some of the corridors are lightly loaded and some of the corridors get over loaded. This raises serious challenge in operating the power system in secure and reliable manner. To cope with this problem Flexible AC Transmission Systems (FACTS) is used. It plays a very important role in improving the power system operating performance. In this paper load flow models for STATCOM and SVC have been developed. Power flow study of a five bus system is carried out with and without FACTS controllers. Results of the power flow studies are obtained with MATLAB programming.

L-Index Modulated Voltage Source Converter

2008 ◽  
Vol 9 (5) ◽  
Author(s):  
Damian O Dike ◽  
Satish M Mahajan
Keyword(s):  
Power System ◽  
Reactive Power ◽  
Reactive Power Compensation ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Flexible Ac Transmission ◽  
Self Tuning ◽  
Modulation Signal ◽  
Status Indicator ◽  
Ac Transmission

A strategy is presented for the self-tuning of a voltage source converter (VSC) based Flexible AC Transmission Systems (FACTS) according to the prevailing system condition. L-index, which is a power system voltage stability status indicator, and its associated parameters are used to automatically regulate the modulation signal of the VSC. This will lead to a proportionate adjusting of the magnitude of the current injected into, or absorbed from, the interconnected load bus by the FACTS device. This regulating scheme will enhance seamless and optimal reactive power compensation by utilizing the dynamic operational nature of present day distressed power system networks. Results obtained using this method when applied to selected load buses of the IEEE 14 bus system under varying practical scenarios showed its capability to appropriately control FACTS devices operation to accommodate system changing conditions. It is hoped that the outcome of this work will provide efficient tools for the determination of power system status, ensure optimal utilization of the dynamic reactive power compensation devices and reduce system outages.

Optimal Allocation of FACTS Devices by Using Multi-Objective Optimal Power Flow and Genetic Algorithms

2006 ◽  
Vol 7 (2) ◽  
Author(s):  
Lucio Ippolito ◽  
Antonio La Cortiglia ◽  
Michele Petrocelli
Keyword(s):  
Power Systems ◽  
Power System ◽  
Power Flow ◽  
Optimal Power Flow ◽  
Optimal Allocation ◽  
Cost Effective ◽  
Optimal Number ◽  
Unified Power Flow Controller ◽  
Open Market ◽  
Ac Transmission

The increases in power flows and environmental constraints are forcing electricity utilities to install new equipment to enhance network operation. Some application of Flexible AC Transmission System (FACTS) technologies to existing high-voltage power systems has proved the use of FACTS technology may be a cost-effective option for power delivery system enhancements. Amongst various power electronic devices, the unified power flow controller (UPFC) device has captured the interest of researchers for its capability of regulating the power flow and minimizing the power losses simultaneously. Since for a cost-effective application of FACTS technology a proper selection of the number and placement of these devices is required, the scope of this paper is to propose a methodology, based on a genetic algorithm, able to identify the optimal number and location of UPFC devices in an assigned power system network for maximizing system capabilities, social welfare and to satisfy contractual requirements in an open market power.In order to validate the usefulness of the approach suggested herein, a case study using a IEEE 30-bus power system is presented and discussed.

scholarly journals Integrating Photovoltaic Systems in Power System: Power Quality Impacts and Optimal Planning Challenges

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Aida Fazliana Abdul Kadir ◽  
Tamer Khatib ◽  
Wilfried Elmenreich
Keyword(s):  
Power Systems ◽  
Power System ◽  
Power Quality ◽  
Distribution System ◽  
Power Flow ◽  
Harmonic Distortion ◽  
Integrated System ◽  
Optimal Planning ◽  
High Penetration ◽  
Bidirectional Power Flow

This paper is an overview of some of the main issues in photovoltaic based distributed generation (PVDG). A discussion of the harmonic distortion produced by PVDG units is presented. The maximum permissible penetration level of PVDG in distribution system is also considered. The general procedures of optimal planning for PVDG placement and sizing are also explained in this paper. The result of this review shows that there are different challenges for integrating PVDG in the power systems. One of these challenges is integrated system reliability whereas the amount of power produced by renewable energy source is consistent. Thus, the high penetration of PVDG into grid can decrease the reliability of the power system network. On the other hand, power quality is considered one of the challenges of PVDG whereas the high penetration of PVDGs can lead to more harmonic propagation into the power system network. In addition to that, voltage fluctuation of the integrated PVDG and reverse power flow are two important challenges to this technology. Finally, protection of power system with integrated PVDG is one of the most critical challenges to this technology as the current protection schemes are designed for unidirectional not bidirectional power flow pattern.

scholarly journals Hopf Bifurcation Control of Subsynchronous Resonance Utilizing UPFC

2017 ◽  
Vol 7 (3) ◽  
pp. 1588-1594
Author(s):  
Μ. Μ. Alomari ◽  
M. S. Widyan ◽  
M. Abdul-Niby ◽  
A. Gheitasi
Keyword(s):  
Power System ◽  
Transmission Line ◽  
Power Flow ◽  
Operating Point ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Unified Power Flow Controller ◽  
Subsynchronous Resonance ◽  
Wide Range ◽  
System Stabilizer

The use of a unified power flow controller (UPFC) to control the bifurcations of a subsynchronous resonance (SSR) in a multi-machine power system is introduced in this study. UPFC is one of the flexible AC transmission systems (FACTS) where a voltage source converter (VSC) is used based on gate-turn-off (GTO) thyristor valve technology. Furthermore, UPFC can be used as a stabilizer by means of a power system stabilizer (PSS). The considered system is a modified version of the second system of the IEEE second benchmark model of subsynchronous resonance where the UPFC is added to its transmission line. The dynamic effects of the machine components on SSR are considered. Time domain simulations based on the complete nonlinear dynamical mathematical model are used for numerical simulations. The results in case of including UPFC are compared to the case where the transmission line is conventionally compensated (without UPFC) where two Hopf bifurcations are predicted with unstable operating point at wide range of compensation levels. For UPFC systems, it is worth to mention that the operating point of the system never loses stability at all realistic compensation degrees and therefore all power system bifurcations have been eliminated.

scholarly journals Modelling of a Two-Stage Bidirectional AC-DC Converter using Wavelet Modulation

2018 ◽  
Vol 9 (3) ◽  
pp. 1006
Author(s):  
H.K. Chiu ◽  
Agileswari K. Ramasamy ◽  
Nadia M.L. Tan ◽  
Matthew Y.W. Teow
Keyword(s):  
Power Flow ◽  
High Efficiency ◽  
Harmonic Distortion ◽  
Two Stage ◽  
Bidirectional Converter ◽  
Three Phase ◽  
Dc Component ◽  
And Performance ◽  
Bidirectional Power Flow ◽  
Ev Charging

<span lang="EN-US">In this paper, a Wavelet modulated isolated two-stage three-phase bidirectional AC-DC converter is proposed for electric vehicle (EV) charging systems. Half-bridge resonant CLLC converter is proposed due to its high efficiency, wide gain range, galvanic isolation and bidirectional power flow. Wavelet modulation technique is used for three-phase six leg AC-DC converter due to its benefits of high DC component and lower harmonic contents. The proposed two-stage converter is developed and simulated in MATLAB Simulink environment. The contribution of this paper is on the implementation and performance analysis of Wavelet modulation in bidirectional AC-DC converters. The results show that Wavelet modulation is suitable to be implemented for the proposed bidirectional converter. The performance of the proposed converter delivers very low output voltage ripple and total harmonic distortion output current of less than 10% which is within the expected results.</span>

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