A Novel Load Shedding Scheme in Power Systems within the Local Power Controller

سال انتشار: 1395
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 548

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شناسه ملی سند علمی:

KBEI03_022

تاریخ نمایه سازی: 11 مرداد 1396

چکیده مقاله:

Following large system disturbances, a solution to reduce the potential risk of occurrence and extent of the blackout is to intentionally create system islands so that the disturbed system elements are isolated and the supply to the created islands can be maintained. In order to preserve the created islands, generations within the islands are discharged and if it is needed local loads can be shed so that frequency and voltage can remain within required limits. In this paper we will represent a priority-based load shedding scheme executed among a Local Power Controller (LPC) to help the controlling of islanded microgrids in order to provide support to the main network during frequency deviation events while keeping high security level of supply to local critical loads. The load shedding scheme uses frequency and rate of change of frequency (ROCOF) measurements to trigger the shedding processes and requires minimum instrumentation, and it is most suitable for end-users with critical loads such as hospitals and data centers. The scheme is also provided with a load addition mechanism, when the system frequency recovers to a certain level the mechanism allows automatically switching on the shed loads. The scheme is tested and demonstrated in a laboratory microgrid environment under two operation modes, i.e. enabling load shedding process in advance of and subsequent to the islanded condition. In both cases the results show that the scheme is capable of sustaining the islands. In the following Potential enhancements to the scheme to incorporate demand-side information for a smarter and faster algorithm to minimize the interruption of supply are presented, and future activities to investigate the communication requirements to support the practical implementation of such a scheme are also discussed.

نویسندگان

Farzad Roozitalab

Islamic azad university, marvdasht branch

Mohammad Amin Jarrahi

Shiraz University, School of Electrical and Computer Engineering

Shahriar Bazyari

Hormozgan electiric distribution compan

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