Optimum load shedding for avoiding steady-state voltage instability

Abstract:Undervoltage load shedding (UVLS) is an effective measure for restoring voltage stability as a last resort in emergency conditions. In this paper, a UVLS scheme is proposed considering the uncertainties of load and line parameters. The loading margin is considered as the voltage stability index. The proposed scheme determines the optimal load shedding pattern subject to technical constraints. The info-gap decision theory uncertainty modeling technique is utilized to find a robust and cost-effective pattern of load shedding. The proposed scheme is formulated as a nonlinear programming problem, which is solved using the sequential quadratic programming technique. The performance of the proposed scheme is verified for the IEEE-14 bus and IEEE-118 bus test systems.

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“…Optimal locations and amounts of load shedding in a deterministic UVLS scheme were determined in [16].…”

Section: Introductionmentioning

confidence: 99%

A robust undervoltage load shedding scheme against voltage instability

Kaffashan¹,

Mortezaee²,

Amraee³

2016

Turk J Elec Eng & Comp Sci

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“…Tuan et al [7] presented a viable load shedding algorithm which determines the load to be shed based on sensitivity of indicator with respect to load. El-Sadek et al [8] developed a methodology for optimum load shedding using L-indicator under emergency to avoid voltage instability problem. Successive load flow runs are required to accomplish proposed technique.…”

Section: Introductionmentioning

confidence: 99%

Differential evolution applied for anticipatory load shedding with voltage stability considerations

Arya¹,

Singh²,

Titare

2012

International Journal of Electrical Power & Energy Systems

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“…T here exist many types of emergency controls, such as generator tripping, load shedding, capacitors/ reactors switching, steam turbine fast-regulation valve, generator transient excitation boosting, etc. Among them, emergency secondaryvoltage control [4,5] and load shedding [6,7] are two important means to prevent voltage collapse. T here are papers reporting on how to implement these two controls individually; however, it is a big issue to best coordinate them e OE ectively and economically.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Emergency Control for Power Systems

Hu¹

2001

Electric Power Components and Systems

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Vo ltage stability is one o f the key issue s in the o pe ratio n o f mode rn po we r syste ms. M any e mergenc y contro ls have bee n carried out to prevent vo ltage co llapse . In this pape r, a hybrid method is pro posed fo r power syste m emergenc y co ntro l to coo rdinate seco ndary vo ltage co ntro l and load-shedding. T he pro po sed hybrid technique consists o f two laye rs: the lo we r laye r is the local co ntinuo us-time contro lle rs, while the higher laye r is the supervisory o ne drive n by the disc re te-e vents to coo rdinate the low-le vel co ntro lle rs. In this paper, the co nce pt o f hybrid syste m is introduced rst. T hen the imple mentatio n o f a hybrid method for the e mergency co ntro l is described. Simulatio n re sults o n the data o f a real syste m verify the e OE ec tive ness of the pro po sed hybrid contro l methodo logy. K eywords hybrid system, power system emergency control, voltage stability

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Optimum load shedding for avoiding steady-state voltage instability

Cited by 19 publications

References 5 publications

A robust undervoltage load shedding scheme against voltage instability

A robust undervoltage load shedding scheme against voltage instability

Differential evolution applied for anticipatory load shedding with voltage stability considerations

Hybrid Emergency Control for Power Systems

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