IEEE PSS2B versus PSS4B: the limits of performance of modern power system stabilizers

Hydro-Quebec, Varennes, Que., Canada
IEEE Transactions on Power Systems (Impact Factor: 2.92). 06/2005; DOI: 10.1109/TPWRS.2005.846197
Source: IEEE Xplore

ABSTRACT IEEE Std 421.5 as revised by the IEEE excitation system subcommittee will introduce a new type of power system stabilizer model, the multiband power system stabilizers (PSSs). Although it requires two inputs, like the widely used IEEE PSS2B, an integral of accelerating power PSS introduced at the beginning of the nineties as the first practical implementation of a digital PSS, the underlying principle of the new IEEE PSS4B makes it sharply different. The present paper aims at assessing the two families of PSS's from the point of view of their relative performance in tackling a wide range of system problems, using a single set of so-called robust/universal settings. Conclusions are drawn from a large number of small- and large-signal analyzes performed on several test systems and on an actual Hydro-Que´bec system, paying due account to the load models and governor response. Since either of the candidate PSSs can easily be tuned to perform acceptably in a standard local and/or inter-area oscillation scenario, emphasis will be put on comparing them at the inherent limits of the PSS concept, i.e., considering excessive VAR modulation during large generation rejection, fast load pickup on hydro units, and excessive torsional interactions during faults on large turbine-generators.

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    ABSTRACT: In the context of modern interconnected electrical networks, power systems stabilizers are considered an essential control mean to improve stability and transmission capacity. In the last ten years, open markets have created many opportunities to interconnect local and regional systems. With these additional electrical links were introduced new electromechanical modes of oscillation between electrically coherent power plants or areas. When large electrical areas are involved, corresponding inter-area modes may be as low as 0.1 Hz. On the other hand, inter-machines oscillations found in a given power plant may reach frequencies as high as 4.0 Hz when machine inertia are small and exciter gains are high. Power system stabilizers are therefore facing a wide range of oscillating modes and their ideal duty is to damp them all efficiently. Damping performances are required to enhance power system stability and to increase power transfer capabilities. A new Multi-band Power System Stabilizer (MP-PSS) was developed to achieve wide frequency band damping improvement of power system electromechanical oscillations. The structure of the MPSS algorithm provides an optimum tuning for all possible power system electromechanical oscillation modes covering the lowest possible global and inter-area modes up to the highest possible local mode frequencies. The MB-PSS has been recently standardized as the PSS4B in the IEEE Std. 421.5 -2005. Hydro-Québec and ABB jointly developed this product that is now being deployed on Hydro-Québec power system. Up to now, implementation was made in several power plants on hydraulic and turbo generators and in 735 kV substations on synchronous condensers. It is also planned to use this piece of equipment for new control loops on Static Var Compensators in a near future.
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    ABSTRACT: The operation under part load condition is one of the major difficulties in hydro units. Especially severe pressure oscillations can occur for Francis turbine units in part load condition. They are generated by an unsteady vortex behaviour in the draft tube, so-called vortex rope. This paper presents PSS (Power system stabilizer) design for Vortex Rope Oscillation (VRO) in single machine infinite bus system. The main motivation for this design is to stabilize or to control low-frequency oscillation on power systems caused by VRO. The optimal parameters of the PSS are obtained employing Genetic Algorithm (GA) using Integral of Time Multiplied Absolute Value of the Error (ITAE) criteria. Finally, the simulation results of PSS behaviour for Vortex Rope Oscillation are discussed.
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    ABSTRACT: Formerly TP462 © IEEE 2013 The Institute of Electrical and Electronic Engineers, Inc. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher.


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