An LMI-SSI model based PSS design approach for a multi-machine power system

Tang, Ke; Venayagamoorthy, G.K.

doi:10.1109/psc.2015.7101715

Cited by 5 publications

(3 citation statements)

References 10 publications

(6 reference statements)

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“…Traditional local PSS makes use of local generator speed deviations to generate a supplementary control signal, which is superimposed on the voltage reference at the AVR of local generator. In this study, local PSSs are designed based on H∞ based robust control approaches [17], and are installed on G1-G12 to maintain power system stability. However, since poorly damped oscillations occur under critical operating conditions, robust wide-area damping controllers are required.…”

Section: Innate Damping Controllermentioning

confidence: 99%

Adaptive inter-area oscillation damping controller for multi-machine power systems

Tang

Venayagamoorthy

2016

Electric Power Systems Research

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The interconnection of multiple generation units in a power system can lead to inter-area oscillations that generally occur under critical operating conditions. To damp these oscillations, supplementary control can be provided by a wide area control (WAC) system using remote measurements from the power system. Wide area controllers designed with traditional approaches are non-adaptive and thus their control policy may not be optimal to nonlinear operation conditions and disturbances. In this paper, the concept of an artificial immune system (AIS) is applied in the development of an innate and adaptive controller to handle known, unknown and random disturbances in a power system. Furthermore, with synchronous generator coherency grouping, remote virtual generator measurements are used to generate supplementary control signals to a synchronous generator that is identified to have maximum controllability on a power system. Real-time simulation and frequency analysis results show the superior performance of AIS-based controller in damping inter-area oscillations for different power system conditions and disturbances.

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Section: Innate Damping Controllermentioning

confidence: 99%

Adaptive inter-area oscillation damping controller for multi-machine power systems

Tang

Venayagamoorthy

2016

Electric Power Systems Research

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“…However, these methods are based on an accurate model of the power system, which is hard to obtain for a practical power system. Moreover, numerous advanced control techniques, such as robust control [14], linear matrix inequality approach [15,16], synergetic control approach [17,18], are proposed to design PSSs, but the structure and parameter tuning of these controllers are far more complicated than those of the conventional PSS (CPSS) and hence not preferred by the engineers and transmission system operators. Consequently, the CPSSs are widely used in the practical power system and still tuned individually by phase compensate method in China [5,19].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Power System Stability Using a Novel Power System Stabilizer with Large Critical Gain

Liu¹,

Yao²,

Wen³

2017

Energies

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Abstract:Power system stabilizers (PSSs) are widely used for suppressing low frequency oscillations in practical power systems. However, according to the requirement of the "guide for setting test of power system stabilizer" of China, PSS gain is limited to no more than 1/3 of its critical gain. As a result, PSSs may not provide enough damping to the inter-area mode oscillations. Through analyzing the Heffron-Phillips (H-P) model of the generator with PSS, it is found that exciter mode will become unstable when PSS exceeds its critical gain. This exciter mode is formed by the natural characteristic of the exciter-PSS loop. To address this problem, a novel PSS with a parallel component added to the conventional PSS is proposed to improve its critical gain. Therefore, large gain can be chosen for the proposed PSS to meet the critical gain requirements of the guide and provide enough damping to the inter-area modes simultaneously. Simulation results on the Ximeng coal power station of China verify the effectiveness of the proposed PSS.

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“…Since G13 serves as the slack bus, and G14-G15 are merely equivalence of three minor areas as three generators, local PSSs are installed on G1-G12 tuned with H∞ design approach elaborated in [26]. NE and NY are connected by three crucial transmission lines Bus 8-Bus 9, Bus 2-Bus 1, Bus 27-Bus 1, thus inter-area oscillation between NE and NY can be observed.…”

Section: Introduction Of Ieee 68-bus Power Systemmentioning

confidence: 99%

Damping inter-area oscillations using virtual generator based power system stabilizer

Tang

Venayagamoorthy

2015

Electric Power Systems Research

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In a power system, remote measurements are used by a controller to provide damping torque for inter-area oscillations. In this study, the operating conditions that give rise to inter-area oscillations are investigated using Stochastic Subspace Identification (SSI) based modal analysis. In a power system, generators can be grouped based on coherency and the groups can be represented by Virtual Generators (VGs). Damping inter-area oscillations using Virtual Generator based Power System Stabilizer (VG-PSS) that generates a supplementary control signal to the excitation system of one or more synchronous generators is presented. The generator choice for VG-PSS location is determined based on the generator that has maximum controllability on dominant weakly damped inter-area mode(s) in a power system. Modal analysis using SSI and real-time simulation results on the IEEE 68-bus power system are presented to illustrate the effectiveness of VG-PSSs in damping inter-area oscillations. In addition, the effect of time delays encountered as a result of wide area measurements and communications are considered in the studies presented.

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An LMI-SSI model based PSS design approach for a multi-machine power system

Cited by 5 publications

References 10 publications

Adaptive inter-area oscillation damping controller for multi-machine power systems

Adaptive inter-area oscillation damping controller for multi-machine power systems

Enhancement of Power System Stability Using a Novel Power System Stabilizer with Large Critical Gain

Damping inter-area oscillations using virtual generator based power system stabilizer

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