Local vs. wide-area undervoltage load shedding in the presence of induction motor loads

Otomega, Bogdan; Cutsem, Thierry Van

doi:10.1109/ptc.2009.5282247

Cited by 10 publications

(8 citation statements)

References 9 publications

(16 reference statements)

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“…Tests reported in [9] have shown that the proposed widearea protection scheme performs very well against long-term voltage instability. Regarding the controller settings, tests carried out with V matter the voltage threshold value.…”

Section: B Identical Controllers Dealing With Long-term Instabilitymentioning

confidence: 95%

“…In the results presented so far (and in [9]) only nonmotor loads were curtailed. In principle, this leads to a more severe situation since the whole induction motor load remains connected to the system.…”

Section: B Identical Controllers Dealing With Long-term Instabilitymentioning

confidence: 99%

“…In order to reconcile these two important requirements, an extension bearing the spirit of wide-area protection [5] was developed and reported in [9]. The idea is to send to the controllers an additional signal allowing them to significantly decrease their activation delay τ LT .…”

Section: A Protection Against Long-term Voltage Instabilitymentioning

confidence: 99%

“…The extended load shedding scheme has been tested on the Nordic32 test system, as in [9]. Its one-line diagram is shown in Fig.…”

Section: A Test Systemmentioning

confidence: 99%

“…[9], where the impact of the induction motor loads on a load shedding protection scheme designed to deal with long-term voltage instability, initialy proposed in [10], was under study. For the load shedding scheme to cope with the fast response of motor loads, additional information exchange was required in order to enable the protection action with a reduced time delay.…”

Section: Introductionmentioning

confidence: 99%

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A load shedding scheme against both short- and long-term voltage instabilities in the presence of induction motors

Otomega

Cutsem

2011

2011 IEEE Trondheim PowerTech

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This paper is the continuation of Ref. [9], where the impact of the induction motor loads on a load shedding protection scheme designed to deal with long-term voltage instability, initialy proposed in [10], was under study. For the load shedding scheme to cope with the fast response of motor loads, additional information exchange was required in order to enable the protection action with a reduced time delay. Therefore, the protection scheme changed from a purely distributed to wide-area, although simplicity was maintained. Moreover, the latter preserved important features such as closed-loop operation and redundancy between controllers.The proposed scheme was successfully tested under severe situation, as it was assumed that only non-motor loads can be shed.B. Otomega (bogdan.otomega@yahoo.com) is senior lecturer in the Power Systems Dept. of the "Politehnica" University of Bucharest, Romania. Induction motors due to their ability to reaccelerate after a fault, play an important role in short-term voltage instability. The objective of the paper is to report on the extension of the protection scheme dealing with short-term voltage instability.Furthermore, this paper will also compare the effect of shedding motor vs. non-motor loads. II. PRINCIPLE OF THE COMBINED PROTECTION SCHEME A. Protection against long-term voltage instabilityThe most important settings of an undervoltage load shedding scheme are the voltage threshold V th below which the controller starts curtailing load, and the delay τ before loads are effectively disconnected.In long-term voltage instability scenarios, where voltage degradation is precipitated by generator field current limitations, the voltage threshold value V th LT has to be set high enough, typically in the range [0.8 0.9] pu, as illustrated in Fig. 1 with the rightmost curve. The main consequence is that the corresponding delay τ LT should be large enough in order not to shed load inadvertently in case of a normally cleared fault. This is illustrated in Fig. 2, showing the minimum delay τ min LT that could be chosen when V th LT is set to 0.90 pu. Shorter delays could be considered if, at the same time, V th LT was set to a lower value.In the presence of induction motor loads, the final voltage collapse can be very fast, as illustrated by the five curves in the middle of Fig. 1, corresponding to various proportions

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Section: B Identical Controllers Dealing With Long-term Instabilitymentioning

confidence: 95%

Section: B Identical Controllers Dealing With Long-term Instabilitymentioning

confidence: 99%

Section: A Protection Against Long-term Voltage Instabilitymentioning

confidence: 99%

“…The extended load shedding scheme has been tested on the Nordic32 test system, as in [9]. Its one-line diagram is shown in Fig.…”

Section: A Test Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A load shedding scheme against both short- and long-term voltage instabilities in the presence of induction motors

Otomega

Cutsem

2011

2011 IEEE Trondheim PowerTech

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Emergency Control of Voltage Instability

2022

Voltage Stability in Electrical Power Systems

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An optimization method of UFLS/UVLS considering the interaction of system state information

Tang

Wang

et al. 2018

IEEJ Transactions Elec Engng

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Because of the differences of grid network architecture, generator parameters, and load characteristics, frequency and voltage at grid nodes show certain spatial distribution characteristics when faults happen. Therefore, the same stability control measures may result in different control effects if applied at different nodes. Meanwhile, in order to improve the control effect and reduce stable control cost, the impacts of the interactions between strongly coupled factors, such as frequency, voltage, active power, reactive power and other quantities, on the effects of stability control measures need to be considered. A new optimization control strategy of under‐frequency load shedding/under‐voltage load shedding is proposed in this paper based on the load control sensitivity index. The method takes into consideration the spatial distribution characteristics of frequency and voltage, as well as the real‐time interaction characteristics of the coupled electrical quantities. Compared with the traditional load‐shedding scheme, the proposed scheme can achieve better control results. The effectiveness of the proposed method is verified through a time‐domain simulation of two actual provincial power grids. © 2018 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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Local vs. wide-area undervoltage load shedding in the presence of induction motor loads

Cited by 10 publications

References 9 publications

A load shedding scheme against both short- and long-term voltage instabilities in the presence of induction motors

A load shedding scheme against both short- and long-term voltage instabilities in the presence of induction motors

Emergency Control of Voltage Instability

An optimization method of UFLS/UVLS considering the interaction of system state information

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