A robust undervoltage load shedding scheme against voltage instability

Kaffashan, Iman; Mortezaee, Seyed Mohammad Taghi Mirali; Amraee, Turaj

doi:10.3906/elk-1411-182

Cited by 8 publications

(7 citation statements)

References 22 publications

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“…In [21], line VSI (Voltage Stability Index) was proposed as a method to load shed that avoids the maximum loading point. L-indicator method was modified in [22] and VSI was used as load margin in [23]. In all the above algorithms, either frequency is considered in load shedding or voltage is considered.…”

Section: Raghu C N a Manjunatha G Raghavendramentioning

confidence: 99%

Voltage and Frequency Based Optimal Load Shedding using Improved Self Adaptive Harmony Search Algorithm

Raghu¹,

Manjunatha²,

Raghavendra³

2019

IJITEE

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This study presents, two load shedding scheme that are simulated on IEEE-14 bus systems are voltage dependent priority based approach and voltage and frequency based NVSI methods. The frequency-based method is designed to consider the rate of change of frequency to estimate the power loss and thereby trigger the load shedding when the frequency or rate of change of frequency exceeds the corresponding thresholds. A novel method voltage and frequency-based load shedding scheme is designed to estimate the real and reactive power losses using frequency. After estimating the power loss, the buses are indexed using the Novel Voltage Stability Index (NVSI) to select the load buses for load shedding. The loads to be shed at each of the buses are determined using the improved self adaptive harmony search(ISAHS) algorithm. Simulation results of voltage and frequency based NVSI method are presented in comparison with voltage dependent priority based approach.

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Section: Raghu C N a Manjunatha G Raghavendramentioning

confidence: 99%

Voltage and Frequency Based Optimal Load Shedding using Improved Self Adaptive Harmony Search Algorithm

Raghu¹,

Manjunatha²,

Raghavendra³

2019

IJITEE

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“…A conventional UVLS executed by the protective relays was introduced in [17] using a Voltage Stability (VS) violation algorithm based on decentralized configurations. The relays were configured to operate at fixed time delay and threshold voltage.…”

Section: Introductionmentioning

confidence: 99%

A Multi-Stage Under-Voltage Load Shedding Scheme using a DIgSILENT power factory software to stabilize the power system network

Mnguni¹

2020

International Journal of Engineering Research and Technology

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The electrical power system environment is based on generation, transmission and distribution. The best practice of the power system is that the generation plant must always be far from the consumers (load demand). The practice created a space where the power needs to be transmitted and distributed to the consumers. During this process, it is critical and important to keep the supply to the consumers at all times. Since the power systems are exposed to all vast condition, it is exposed to a dangerous environment. On the other hand, the load demand is continuously increasing and this can lead to power system instability. The objective of electrical engineers is to protect the power system and maintain stability. One of the best indicators that are used to monitor power system activities is the voltage. When power generation is not able to meet the load demand the system becomes unstable and this has become a concern last two decades. The paper presents Under-Voltage Load Shedding (UVLS) scheme is implemented in a multi-area power system network. The voltage studies are provided to get information and knowledge on how to develop an ideal under-voltage load shedding scheme. The objectives of the paper are to assist with deciding on the security of the system under the various conditions that can lead to power system stability. The objectives are mitigated by developing and implementing a multistage UVLS scheme for power utilities. The new proposed scheme is based on soft Intelligent Electronic Devices (IEDs). The proposed technique makes use of the DIgSILENT power factory platform where the whole system is modeled for simulations. A comprehensive case study is presented to analyze problems that are formed by voltage instability. The paper gives answers to questions such as: How and why does instability occur? What are the parameters or what are the main reasons for voltage instability? What are the key factors contributing to voltage instability? What are the voltage weak areas? What measures are most effective in improving voltage stability? based on the fundamental dependencies between the voltage, power, and current in power networks with loads. It also elaborates on the effect of power system instability when exposed to some contingency. The power flow study is deployed to determine the optimal system operating conditions of the IEEE39 bus system. Methods such as the PV curve and QV curve are applied in the paper to find the critical operation point before the voltage instability occurs in the power system. Five case studies were implemented where the proposed algorithm uses the Intelligent Electronic Devices (IED) to implement the Under Voltage Load Shedding (UVLS) scheme wherein a case the voltage elements are used for voltage monitoring. The developments in this paper extended the capability of the DIgSILENT power factory software to be used for more advanced power stabilities studies

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“…The conventional UVLS scheme is executed in the case of a violation of voltage stability criteria. A UVLS scheme is used in conditions where the voltage magnitude becomes lower than a predefined value [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Decentralized Load Shedding Method Based on Voltage Stability Margin Index Using Synchrophasor Measurement Technology

Lee

Song

2018

Electronics

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This study develops an analytical method for assessing the voltage stability margins of a decentralized load shedding scheme; it then examines the challenges related to the existing load shedding scheme. It also presents a practical application for implementing the proposed method, based on the synchrophasor measurement technology in modern power grid operations. By applying the concept of a continuously-computed voltage stability margin index to the configuration of the Thévenin equivalent system, the maximum transfer power could be used as an index to monitor the voltage instability phenomenon and thus determine the required load shedding amount. Thus, the calculated voltage stability margin might be a useful index for system operators in the critical decision-making process of load shedding. Dynamic simulations are performed on real Korean power systems as case studies. Simulation results, when comparing the existing and proposed methods, showed that there was a considerable reduction in the amount of load shedding in the voltage instability scenario. This indicates that the synchrophasor measurement technology has a considerable effect on the proposed load shedding method. The simulation results have validated the performance of the proposed method.

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A robust undervoltage load shedding scheme against voltage instability

Cited by 8 publications

References 22 publications

Voltage and Frequency Based Optimal Load Shedding using Improved Self Adaptive Harmony Search Algorithm

Voltage and Frequency Based Optimal Load Shedding using Improved Self Adaptive Harmony Search Algorithm

A Multi-Stage Under-Voltage Load Shedding Scheme using a DIgSILENT power factory software to stabilize the power system network

Decentralized Load Shedding Method Based on Voltage Stability Margin Index Using Synchrophasor Measurement Technology

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