Power Research

N. Senthil Kumar ¹

Affiliations
1 Associate Professor, School of Electrical Engineering, VIT University, Chennai Campus, Chennai -600127

Abstract

This contribution discusses and compares different control techniques for damping undesirable electromechancial oscillations in power systems by means of power system stabilizer and Series / Shunt FACTS controllers. The linearized model of the power system is derived with FACTS controllers and the problem of small signal stability enhancement is formulated as an optimization problem to maximize the damping ratio of critical electro mechanical modes in the power system. Particle swarm optimization (PSO) technique is applied to tune the controller parameters of the PSS and FACTS controllers. The following FACTs controllers are taken for analysis (i) Static Var Compensator (SVC) (ii) Static Compensator (STATCOM) (iii) Thyristor Controlled Series Capacitor (TCSC) (iv) Unified Power Flow Controller (UPFC) .

Keywords

Small Signal Stability, Power system oscillations, SVC, STATCOM, TCSC, UPFC, Particle Swarm Optimization

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Anirudh Singh ¹, Shikhar Dwivedi ¹, N. Senthil Kumar ²

Affiliations
1 Final year B.Tech (Electrical and Electronics Engg), School of Electrical Engineering, VIT Chennai, IN
2 Associate Professor School of Electrical Engineering, VIT Chennai, IN

Abstract

Wide area monitoring and control using Phasor Measurement Units (PMU’s) will continue to remain as one of the integral components of large power systems for different important applications in power systems which includes dynamic state estimation, power oscillation monitoring, Transient Stability Assessment etc. A wide area measuring system is composed of a PMU with High Speed Communication Channels and Phasor data concentrators. This paper explores the modeling and application of a typical phasor measurement unit to monitor voltage and current swings for different types faults and disturbances in the standard four generator two area power system.

Keywords

Phasors, phasor measurement unit, wide measurement and control, dynamic analysis.

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V. K. Arunshankar ¹, N. Senthil Kumar ²

Affiliations
1 PG Scholar, M.Tech (Power Electronics and Drives), VIT University, Chennai, IN
2 Associate Professor, School of Electrical Engineering, VIT University, Chennai, IN

Abstract

This paper presents and develops a LabVIEW based mathematical model for power quality analysis and enhancement. The different types of power quality problems such as voltage sag, voltage swell, power frequency distortions, and harmonic distortions can be identified and controlled suitably. Besides standard undisturbed three-phase voltage signal waveforms, six different categories of the PQ disturbances characteristic for real-time power distribution networks can be simulated on the basis of developed virtual instruments: voltage swells, sags, interruptions, high-order voltage harmonics, swells with harmonics and sags with harmonics. Each of simulated PQ disturbances can be predefined and easily changed according to user requirements, using various combinations of the control settings implemented on the virtual instrument front panel. All computations are carried out using LabVIEW 9.0.

Keywords

Electric power quality (PQ), Virtual instruments-LabVIEW, Harmonic distortions; Signal Processing, Active power filter (APF).

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N. Senthil Kumar ¹

Affiliations
1 Associate professor, School of Electrical Engineering, VIT University, Chennai Campus.chennai-600 127, IN

Abstract

In this paper, a fuzzy logic controller is proposed for a Unified Power Flow Controller (UPFC) installed in a single-machine infinite-bus power system. The Fuzzy Logic controller is mainly equipped to damp power system oscillations. Simple Fuzzy Logic controller using mamdani-type inference system is used. The Fuzzy Logic based UPFC controller is designed by selecting appropriate controller parameters based on the knowledge of the power system performance. The effectiveness of the new controller is demonstrated through time-domain simulation studies. By comparison, it can be seen that the proposed UPFC controller can provide good performance for different operating conditions of power system. The results of these studies show that the designed controller is robust enough to damp power system oscillations with change in system operating conditions.

Keywords

FACTS, UPFC, Fuzzy Logic, Power System Oscillations

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