Undervoltage Load Shedding

Mozina, Charles J.

doi:10.1109/cpre.2007.359889

Cited by 26 publications

(15 citation statements)

References 2 publications

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“…The combinational load shedding relays measure the voltage magnitude at the primary side of the transformers and trip the load feeders at the secondary side. The voltage measurement must be on the primary side since transformer load tap changing controls distort the true transmission system voltage level at the secondary side [5].…”

Section: Designing the Linear Load Shedding Methodsmentioning

confidence: 99%

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Enhancement of Power System Stability Using Adaptive Combinational Load Shedding Methods

Saffarian

Sanaye‐Pasand

2011

IEEE Trans. Power Syst.

115

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In the modern power systems operating at lower stability margins, conventional non-adaptive schemes cannot offer adequate protection for securing the power system, especially against combinational events. For major disturbances, the active power deficit is usually accompanied by reactive power deficit and frequency stability and voltage stability of the system are jeopardized simultaneously. In this paper, three adaptive combinational load shedding methods are proposed to improve operation of the conventional underfrequency load shedding scheme in order to enhance power system stability following severe disturbances. The proposed methods use locally measured frequency and voltage signals to counteract such events. In the proposed algorithms, load shedding is started from the locations which have higher voltage decay for longer period of time. The speed, location, and amount of load shedding are changed adaptively depending on the disturbance location, voltage status of the system, and the rate of frequency decline. Operation of the conventional and the proposed load shedding methods have been simulated in an actual large network. Obtained simulation results confirm that the proposed methods provide considerable enhancement in the power system voltage stability margin, and by using the proposed algorithms, various power system blackouts could be prevented.Index Terms-Adaptive combinational load shedding, rate of frequency decline, underfrequency load shedding, under voltage load shedding, voltage stability margin.

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Section: Designing the Linear Load Shedding Methodsmentioning

confidence: 99%

“…In such events, frequency decline is usually accompanied with voltage decay and the frequency and voltage stability of the system are jeopardized simultaneously. Voltage decays have been the root cause of several power system blackouts over the past decade [5].…”

mentioning

confidence: 99%

Enhancement of Power System Stability Using Adaptive Combinational Load Shedding Methods

Saffarian

Sanaye‐Pasand

2011

IEEE Trans. Power Syst.

115

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“…In particular, the load shedding will be performed by direct tripping the load from the utility transmission sub-station through under-voltage relay installed at the primary of the distribution sub-station located close to key transmission sub-stations [41]. This would also cause additional delay in actually shedding the loads.…”

Section: E Case 3: Effect Of Communication and Implementationmentioning

confidence: 99%

A decentralized multi-agent based voltage control for catastrophic disturbances in a power system

Islam

Sutanto

Muttaqi

2013

2013 IEEE Industry Applications Society Annual Meeting

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In this paper, a multiagent-based voltage and reactive power control in the case of a multiple contingency is presented. Incorporating the agent-based autonomous feature to the intelligence of the remote terminal units, the present power system control structure can be used to help in preventing system voltage collapse during catastrophic disturbances. The control algorithm is based on a decentralized architecture of intelligent agents and the determination of a local zone that can carry out quick countermeasures in a decentralized manner as a multiagent system (MAS) during an emergency situation. An adaptive determination of the local zones undergoing voltage collapse has been developed based on the electrical distances among the generators and loads. Once assigned, the elements of the Jacobian matrix can be used to determine the optimum actions that need to be carried out at each power system element (such as increasing the voltages of generators and load shedding) within the assigned local zone. The contract net protocol is used for agent interactions. Simulation results using the IEEE-57 bus system show that the proposed method can act quickly to respond to emergency conditions to ensure that voltage collapse can be avoided. This journal article is available at Research Online: http://ro.uow.edu.au/eispapers/4674 1 Abstract--In this paper, a multi-agent based voltage and reactive power control in the case of a multiple contingency is presented. Incorporating the agent based autonomous feature to the intelligence of the Remote Terminal Units (RTUs), the present power system control structure can be used to help in preventing system voltage collapse during catastrophic disturbances. The control algorithm is based on a decentralized architecture of intelligent agents and the determination of a local zone that can carry out quick countermeasures in a decentralized manner as a multi-agent system (MAS) during an emergency situation. An adaptive determination of the local zones undergoing voltage collapse has been developed based on the electrical distances among the generators and loads. Once assigned, the elements of the Jacobian matrix can be used to determine the optimum actions that need to be carried out at each power system element (such as increasing the voltages of generators and load shedding) within the assigned local zone. The contract-net-protocol (CNP) is used for agent interactions. Simulation results using IEEE-57 bus system show that the proposed method can act quickly to respond to emergency conditions to ensure that voltage collapse can be avoided.

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“…However, even if voltages reach a safe operating value, it is well known that bus voltage magnitude is not an adequate indicator of the security of power system operating conditions, especially in modern power systems (Mozina, 2007). Therefore, these UVLS strategies do not guarantee that the operating point after shedding is adequate in terms of voltage stability.…”

Section: Introductionmentioning

confidence: 98%

Optimal under voltage load shedding based on voltage stability index

López¹,

Pérez²,

Rodríguez³

2016

ing.inv.

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This paper presents a methodology for under voltage load shedding using a metaheuristic optimization technique and a stability criterion. Two strategies are proposed to find the minimal size and location of load to shed for the recovery of normal operation conditions. The first one is based on a classical criterion for the under voltage load shedding, identifying the load to disconnect by considering bus voltage level; the second includes a simplified voltage stability index SVSI, which identifies critical buses in the system. The proposed methodology is implemented in an IEEE 14 bus test system, considering a heavy loading condition with and without contingency to validate its efficiency.Keywords: Load shedding, voltage stability, particle swarm optimization. RESUMENEn este artículo se presenta una metodología para realizar el deslastre de carga por baja tensión utilizando una técnica de optimización metaheuristica y criterios de estabilidad. Se proponen dos estrategias para encontrar tanto la cantidad mínima de carga a deslastrar como su localización en el sistema, para recuperar las condiciones normales de operación. El primero está basado en el criterio clásico del deslastre de carga por baja tensión, donde se identifica la carga a desconectar considerando los niveles de tensión en las barras del sistema; el segundo incluye el índice simplficado de estabilidad de tensión SVSI, el cual identifica las barras críticas en el sistema. La propuesta se valida en el sistema de prueba IEEE de 14 barras cuando es sometido a varias perturbaciones.Palabras clave: Deslastre de carga, estabilidad de tensión, optimización por enjambre de partículas.

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Undervoltage Load Shedding

Cited by 26 publications

References 2 publications

Enhancement of Power System Stability Using Adaptive Combinational Load Shedding Methods

Enhancement of Power System Stability Using Adaptive Combinational Load Shedding Methods

A decentralized multi-agent based voltage control for catastrophic disturbances in a power system

Optimal under voltage load shedding based on voltage stability index

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