A UFLS Scheme for Small Isolated Power Systems Using Rate-of-Change of Frequency

Sigrist, Lukas

doi:10.1109/tpwrs.2014.2357218

Cited by 51 publications

(29 citation statements)

References 7 publications

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“…In [26][27][28] adaptive Under Frequency Load-Shedding (UFLS) scheme is proposed, which disconnects predefined loads based on predetermined frequency threshold values. Adaptive UFLS schemes have been further improved by using both frequency and Rate Of Change Of Frequency (ROCOF) in determination of load-shedding requirement [26,29,30]. Nevertheless, ROCOF can differ for system disturbances in PCC and may vary in time due to transition to islanded mode leading to malfunction.…”

Section: Introductionmentioning

confidence: 99%

A New Adaptive Load-Shedding and Restoration Strategy for Autonomous Operation of Microgrids: A Real-Time Study

Farzinfar

Nair

Bahadornejad

2020

IJE

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A B S T R A C TIslanding operation is one of the main features of a MicroGrid (MG), which is realized regarding the presence of distributed energy resources (DERs). However, in order to deal with the control challenges, which an MG faces during island operation, particularly when the transition is associated with certain excessive load, an efficient control strategy is required. This paper introduces a Central Management Agent (CMA) which maintains the stability of the MG, once it is islanded, by controlling an Energy Storage System (ESS) and a Central Synchronous Generator (CSG). Further, this paper proposes a new adaptive load-shedding/restoration schemes that calculates the amount of power imbalance based on frequency measurements combined with the mean value of the frequency gradient. The primacy of the proposed scheme over existing schemes, like instantaneous frequency gradient-based load shedding scheme, is its robustness against frequency oscillations. Moreover, the proposed method acts compatible with the control routine of DERs and the intermittent nature of the PV plant. As another salient feature of this paper, a Hardware In the Loop (HIL) testbed for real-time simulation is developed under which the proposed scheme and related communication with CMA along with other components are evaluated. The obtained results show that the control strategy can confidently conserve the stability of the MG in islanded mode and meet smooth reconnection to the grid-connected mode.

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Section: Introductionmentioning

confidence: 99%

A New Adaptive Load-Shedding and Restoration Strategy for Autonomous Operation of Microgrids: A Real-Time Study

Farzinfar

Nair

Bahadornejad

2020

IJE

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“…This result will make damages for the suppliers and customers using the system's power. The authors in [5,6] showed methods to estimate the amount load shedding, which based on the frequency reduction, or the rate of change of frequency (ROCOF). The combination of intelligent load shedding methods has also been studied and developed such as Artificial Neural Network (ANN) [7], fuzzy logic algorithms [8], genetic algorithm (GA) [9] or particle swarm optimization (PSO) algorithm.…”

Section: Introductionmentioning

confidence: 99%

A voltage electrical distance application for power system load shedding considering the primary and secondary generator controls

Nghia¹,

Anh²,

Binh³

et al. 2019

IJECE

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This paper proposes a method for determining location and calculating the minimum amount of power load needed to shed in order to recover the frequency back to the allowable range. Based on the consideration of the primary control of the turbine governor and the reserve power of the generators for secondary control, the minimum amount of load shedding was calculated in order to recover the frequency of the power system. Computation and analysis of the voltage electrical distance between the outage generator and the loads to prioritize distribution of the amount power load shedding at load bus positions. The nearer the load bus from the outage generator is, the higher the amount of load shedding will shed and vice versa. With this technique, a large amount of load shedding could be avoided, hence, saved from economic losses, and customer service interruption. The effectiveness of the proposed method tested on the IEEE 37 bus 9 generators power system standard has demonstrated the effectiveness of this method.

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“…This could cause the over load shedding or the insufficient load shedding. The authors in [6], [7] and [8] present a method to estimate the amount load shedding, it is usually based on the frequency reduction, the rate of change of frequency (ROCOF) or swing equation. Intelligent load shedding methods have also been studied and developed such as artificial neural network (ANN) [9][10], fuzzy logic [11], genetic algorithm (GA) [12][13] and particle swarm optimization (PSO) algorithm [14][15].…”

Section: Introductionmentioning

confidence: 99%

Minimizing Load Shedding in Electricity Networks using the Primary, Secondary Control and the Phase Electrical Distance between Generator and Loads

Le¹,

Quyen²,

Phan³

et al. 2019

ijacsa

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This paper proposes a method for determining location and calculating the minimum amount of power load needed to shed in order to recover the frequency back to the allowable range. Based on the consideration of the primary control of the turbine governor and the reserve power of the generators for secondary control, the minimum amount of load shedding was calculated in order to recover the frequency of the power system. Computation and analysis of the phase electrical distance between the outage generator and the loads to prioritize distribution of the amount power load shedding at load bus positions. The nearer the load bus from the outage generator is, the higher the amount of load shedding will shed and vice versa. With this technique, a large amount of load shedding could be avoided, hence, saved from economic losses, and customer service interruption. The case study simulation has been verified through using PowerWorld sofware systems. The effectiveness of the proposed method tested on the IEEE 37 bus 9 generators power system standard has demonstrated the effectiveness of this method.

show abstract

A UFLS Scheme for Small Isolated Power Systems Using Rate-of-Change of Frequency

Cited by 51 publications

References 7 publications

A New Adaptive Load-Shedding and Restoration Strategy for Autonomous Operation of Microgrids: A Real-Time Study

A New Adaptive Load-Shedding and Restoration Strategy for Autonomous Operation of Microgrids: A Real-Time Study

A voltage electrical distance application for power system load shedding considering the primary and secondary generator controls

Minimizing Load Shedding in Electricity Networks using the Primary, Secondary Control and the Phase Electrical Distance between Generator and Loads

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