New adaptive and centralised under‐voltage load shedding to prevent short‐term voltage instability

Modarresi, Javad; Gholipour, Eskandar; Khodabakhshian, Amin

doi:10.1049/iet-gtd.2017.0783

Cited by 22 publications

(11 citation statements)

References 29 publications

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“…Essentially, this triangle comprises the values of binomial coefficients. Therefore, in the n-th stage, the amount of load shedding encountered by i-th load bus can be expressed using (17).…”

Section: B Proposed Load Shedding Schemementioning

confidence: 99%

“…Apart from UFLS, Under-Voltage Load Shedding (UVLS) schemes are also reported in existing literature. Local measurements are used in [17] to develop a centralised UVLS mechanism to mitigate voltage instability. Another UVLS technique is proposed in [18], which effectively applies load shedding to offset the faultinduced delayed voltage recovery.…”

Section: Introductionmentioning

confidence: 99%

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A Frequency and Voltage Stability-Based Load Shedding Technique for Low Inertia Power Systems

et al. 2021

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The aim of this research work is to develop a load shedding methodology to improve the frequency response of low inertia grids by attaining satisfactory voltage stability. In recent times, wind energy integration has considerably increased in many power grids. Consequently, conventional synchronous machines are being replaced from dispatch. Unlike traditional synchronous machines, variable speed wind turbine generators usually do not take part in frequency regulation without supplementary control mechanism. During substantial wind penetration, a power system may have a small number of online synchronous machines. As a result, synchronous inertia and governor responsive reserve significantly reduce. Under such situation, a system has to rely on load shedding as a last line of defense to rescue the system frequency following a large contingency. However, the conventional Under-Frequency Load Shedding (UFLS) strategy may lead to larger frequency deviation and higher amount of load cut in certain cases. A new load shedding methodology is presented in this paper to overcome this challenge. Unlike conventional UFLS technique, higher proportion of load shedding is applied to relatively weaker buses in terms of voltage stability in the proposed mechanism. Based on reactive power margin, which is an index to specify voltage stability, a general expression to quantify load shedding is derived. Also, the adaptability of the proposed strategy to various load levels is ensured. Later on, performances of the developed strategy are explored in a low inertia wind dominated test network. Simulations are executed considering various penetration levels of wind power and for two severe contingencies -loss of 550 MW interconnection and loss of 650 MW interconnection. Investigations reveal that the proposed load shedding methodology ensures satisfactory frequency response in all simulation cases. Also, the developed technique yields less frequency deviation and load cut compared to the conventional UFLS mechanism. Therefore, the reported load shedding scheme is found to be more competent to concurrently maintain frequency and voltage stabilities in renewable dominated power systems.

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Section: B Proposed Load Shedding Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Frequency and Voltage Stability-Based Load Shedding Technique for Low Inertia Power Systems

et al. 2021

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“…Power systems must be able to maintain steady voltages following large disturbances including system faults, loss of generating unit, line outage, and small disturbances such as incremental changes in load demand [3]. Various voltage reactive control strategies, such as shunt capacitor switching, on-load tap changer tap adjustment and AVR reference voltage coordinated control, can greatly improve the system voltage stability [4]. However, in some cases, the reactive voltage control strategy cannot effectively prevent the voltage from collapsing [5].…”

Section: Introductionmentioning

confidence: 99%

A Network Analysis-Based Distributed Load Shedding Strategy for Voltage Collapse Prevention

Tian

Mou

2019

IEEE Access

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This paper proposes a network analysis-based distributed load shedding strategy for voltage collapse prevention. The two-level framework of the distributed load shedding strategy is proposed. The lower one is consisted of local load shedding controllers, and the upper one is designed to coordinate the local controllers to reduce the total load shedding amount. Through network analysis, two sensitivity indices are derived to form local zones, and determine the load shedding locations and amounts. The voltage control sensitivity is proposed for network partitioning. The local load shedding controller is solved by load shedding sensitivity based piecewise linearization. A load shedding sensitivity based linear programming problem is formulated for the center load shedding controller to coordinate the load shedding amounts of local controllers. Case studies have been conducted to verify the effectiveness of the proposed methods. INDEX TERMS Load shedding, distributed control, network analysis, voltage collapse prevention.

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“…For a predefined time, if the voltage remains below a specified level, some predetermined loads are curtailed. More advanced versions of UVLS against short-term voltage instability are presented in terms of centralised UVLS [17] and optimised UVLS [18] which are able to provide a predetermined loading margin with a minimum amount of load to be shed. An adaptive load shedding method is also presented in [19] to maintain both of the voltage and frequency stability in large disturbances.…”

Section: Introductionmentioning

confidence: 99%

Under‐impedance load shedding: a new preventive action against voltage instability

Hashemi

Sanaye‐Pasand

Abedini

2018

IET Generation, Transmission & Distribution

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New adaptive and centralised under‐voltage load shedding to prevent short‐term voltage instability

Cited by 22 publications

References 29 publications

A Frequency and Voltage Stability-Based Load Shedding Technique for Low Inertia Power Systems

A Frequency and Voltage Stability-Based Load Shedding Technique for Low Inertia Power Systems

A Network Analysis-Based Distributed Load Shedding Strategy for Voltage Collapse Prevention

Under‐impedance load shedding: a new preventive action against voltage instability

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