Centralized coordination of load shedding and protection system of transmission lines

2018 ◽  
Vol 29 (1) ◽  
pp. e2674 ◽  
Author(s):  
Bakhtyar Hoseinzadeh ◽  
Claus Leth Bak
Keyword(s):  
Transmission Lines ◽  
Load Shedding ◽  
Protection System ◽  
Centralized Coordination

scholarly journals Risk-Based Active Power Redispatch Optimization

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 716
Author(s):  
Karol Wawrzyniak ◽  
Endika Urresti Padrón ◽  
Wojciech Jaworski ◽  
Roman Korab
Keyword(s):  
Power System ◽  
Transmission Lines ◽  
Unit Commitment ◽  
Load Shedding ◽  
Security Assessment ◽  
Reference Case ◽  
Dynamic Security Assessment ◽  
System Operator ◽  
Remedial Actions ◽  
The Cost

Risk-based redispatch optimization is proposed as a methodology to support the Transmission System Operator (TSO) with preventive remedial actions obtained by extending the security-constrained unit commitment/economic dispatch with constraints resulting from the risk assessed for the power system. Although being heuristic, the methodology is based on comprehensive dynamic security assessment as time-domain simulations are used, allowing to express the degree of all types of instabilities, e.g., caused by contingencies, in monetary terms. Therefore, the risk is assessed as the expected value of the cost incurred by the TSO. Such an approach forms a new pathway to including risk in planning procedures already used by TSOs. Results obtained for the IEEE39 dynamic power system, with costs assigned to load shedding and generator tripping due to single transmission lines short-circuits, are shown as a reference case.

scholarly journals Analysis of Relay Protection System Comparison for Better Identification of Faults in High Voltage AC Transmission Lines

2021 ◽  
Author(s):  
Rimsha Fazal ◽  
Arooj Aslam ◽  
Habib Ullah Manzoor ◽  
Tareq Manzoor
Keyword(s):  
Transmission Line ◽  
High Voltage ◽  
Transmission Lines ◽  
Circuit Breaker ◽  
Operating Time ◽  
Protection System ◽  
Ground Fault ◽  
Double Phase ◽  
Overcurrent Relay ◽  
Ac Transmission

Abstract A high voltage protection system is designed to protect the system against the hazards like instant high voltage condition like lightening voltage in the rain, power variation in the transmission lines etc. In these conditions, our system may face a voltage twice and thrice greater than its original nominal ratings. In this paper, performance of four different relays (overcurrent relay, over and under voltage relay, distance relay and differential relay) have been calculated based on operating time in 400KV high voltage AC transmission line of 80-250km under different faults, modeled on MATLAB for the identification of different types of faults in a transmission line. These relays can differentiate between the normal operating condition and fault conditions. In this paper simulation comparison of these four relays is presented by comparing their operating time in Single line to ground fault (LG), three phase fault (LLLG) and Double phase to ground fault (LLG). The output waveforms are observed under the normal condition or no-fault condition and in the fault condition and response time is calculated to operate a circuit breaker.

Probabilistic Study of Undervoltage Load Shedding Scheme to Mitigate the Impact of Protection System Hidden Failures

2020 ◽  
Vol 14 (1) ◽  
pp. 862-869 ◽  
Author(s):  
Diptak Pal ◽  
Balimidi Mallikarjuna ◽  
Pathirikkat Gopakumar ◽  
M. Jaya Bharata Reddy ◽  
Bijaya Ketan Panigrahi ◽  
...  
Keyword(s):  
Load Shedding ◽  
Protection System ◽  
Probabilistic Study ◽  
Hidden Failures ◽  
The Impact

scholarly journals Study on Emergency Load Shedding of Hybrid AC/DC Receiving-End Power Grid with Stochastic, Static Characteristics-Dependent Load Model

Energies ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3912 ◽  
Author(s):  
Yingying Jiang ◽  
Xiaolin Chen ◽  
Sui Peng ◽  
Xiao Du ◽  
Dan Xu ◽  
...  
Keyword(s):  
Direct Current ◽  
Transmission Lines ◽  
Power Flow ◽  
Large Scale ◽  
Power Grid ◽  
Fault Analysis ◽  
Load Shedding ◽  
Total Power ◽  
Power Imbalance ◽  
Factors Affecting

When large-capacity HVDC (high voltage direct current) transmission line blocking occurs in a hybrid AC/DC (alternating current/direct current) power grid, the receiving-end system will encounter a huge power imbalance, which will lead to a frequency drop and redistribution of the power flow, and which may further lead to the overload of other transmission lines, cascading failures and a large-scale blackout. To resolve these problems, an emergency load-shedding strategy for the DC receiving-end system is proposed from the perspective of a quasi-steady state. The proposed method can accurately calculate the actual total power imbalance by modeling more detailed stochastic loads with static frequency/voltage characteristics and involving the inertia effect of the generator during the response delay period, which can effectively reduce the amount of load curtailment. In addition, several factors affecting the power imbalance estimation in stochastic scenarios and their mechanisms are analyzed in detail, and the key aspects relevant to the DC blocking fault analysis are identified as well. Finally, the influence of different load-shedding strategies on the receiving-end system security after a DC blocking fault is compared with the security indices, including those that are relevant to the frequency/load change proposed herein, and a uniform load-shedding coefficient is obtained via the proposed method, even for different power imbalances under a stochastic context, which makes the load-shedding strategy more practical.

Transmission Lines Overload Alleviation by Generation Rescheduling and Load Shedding

2016 ◽  
Vol 22 (4) ◽  
Author(s):  
Abdelaziz Y. M. Abbas ◽  
Salah Eldeen Gasim Mohamed Hassan ◽  
Yousif Hassan Abdelrahim
Keyword(s):  
Transmission Lines ◽  
Load Shedding

scholarly journals Risk-based Active Power Redispatch Optimization

2019 ◽  
Author(s):  
Karol Wawrzyniak ◽  
Endika Urresti Padrón ◽  
Wojciech Jaworski ◽  
Roman Korab
Keyword(s):  
Power System ◽  
Transmission Lines ◽  
Unit Commitment ◽  
Load Shedding ◽  
Security Assessment ◽  
Reference Case ◽  
Dynamic Security Assessment ◽  
System Operator ◽  
Remedial Actions ◽  
The Cost

Risk-based redispatch optimization is proposed as a methodology to support the Transmission System Operator (TSO) with preventive remedial actions obtained by extending the security constrained unit commitment/economic dispatch with constraints resulting from the risk assessed for the power system. Although being heuristic, the methodology is based on comprehensive dynamic security assessment as time-domain simulations are used, allowing to express the degree of all types of instabilities, e.g., caused by contingencies, in monetary terms. Therefore, the risk is assessed as the expected value of the cost incurred by the TSO. Such approach forms a new pathway to including risk in planning procedures already used by TSOs. Results obtained for the IEEE39 dynamic power system, with costs assigned to load shedding and generator tripping due to single transmission lines short-circuits, are shown as a reference case.

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