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Research Papers: Gas Turbines: Structures and Dynamics

Application of Turbine Torsional Oscillation Damping Controller to Static Var Compensator

[+] Author and Article Information
Amir Ghorbani

Department of Electrical Engineering,
Abhar Branch,
Islamic Azad University,
Abhar 34367-45619, Iran
e-mail: ghorbani_a@abhariau.ac.ir

Masoud Arablu

Department of Mechanical Engineering
and Engineering Science,
University of North Carolina at Charlotte,
Charlotte, NC 28223
e-mail: marablu@uncc.edu

1Corresponding author.

Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received December 24, 2014; final manuscript received January 1, 2015; published online March 31, 2015. Editor: David Wisler.

J. Eng. Gas Turbines Power 137(10), 102501 (Oct 01, 2015) (6 pages) Paper No: GTP-14-1676; doi: 10.1115/1.4030068 History: Received December 24, 2014; Revised January 01, 2015; Online March 31, 2015

This paper proposes a new auxiliary turbine torsional oscillation damping controller (TTODC) for static var compensator (SVC) to dampen out subsynchronous oscillations in power systems containing series compensated transmission lines. A new TTODC algorithm on the basis of synchronized phasor measurements received from phasor measurement units (PMUs) is presented. The idea of using remote signals obtained from PMU to dampen subsynchronous resonance (SSR) presented, too. An auxiliary TTODC is proposed for a SVC, using the generator rotor speed deviation signal as the stabilizing and remote signal to dampen subsynchronous oscillations. The performance of the controller is verified in a detailed nonlinear system considering eigenvalue analysis and transient simulations. Sturdiness of the controller is examined by applying the disturbances in the system that causes significant changes in generator's operating point. The IEEE second benchmark (SBM) model is used for the analysis and the SVC is simulated using the power system blockset (PSB) in the matlab/simulink environment.

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Figures

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Fig. 1

Schematic representation of IEEE SBM system-1 model with SVC

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Fig. 2

SVC control system with TTODC or SSDC

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Fig. 3

Real parts of torsional modes for different ratios of series compensation

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Fig. 4

FFT analysis of Δω

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Fig. 5

Block diagram of the designed TTODC

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Fig. 6

Behavior of mode-0 for Kp = 6

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Fig. 7

Real parts of SSR modes for different ratios of series compensation after adding the SSDC

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Fig. 8

Real parts of SSR modes for different ratios of series compensation (KP = 6 and 7)

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Fig. 9

SVC and system performed in matlab/simulink environment using the PSB and simulink library

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Fig. 10

Variation of LP–Gen section torque for pulse change in input mechanical torque (SVC with voltage control and without SSDC)

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Fig. 11

Variation of LP–GEN section torque (a) and SVC reactive power (b) for pulse change in input mechanical torque (SVC with SSDC (KP = 2))

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Fig. 12

Variation of LP–GEN section torque for pulse change in input mechanical torque (SVC with SSDC (KP = 4 and KP = 2))

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Fig. 13

FFT analysis of Δω signal (SVC with SSDC (without high-pass filter, KP = 6))

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Fig. 14

Variation of LP–Gen section torque for a–g fault

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