New genetic algorithms for contingencies selection in the static security analysis of electric power systems

Santos, João A.; Costa, Iverson; Nogueira, Thiago

doi:10.1016/j.eswa.2014.11.041

Cited by 21 publications

(4 citation statements)

References 25 publications

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“…Lastly, [9] presents an alternative methodology for shunt reactive power compensation allocation, aiming to reduce total reactive power losses, improve voltage profiles, and increase the loading margin. In the literature, several studies have been conducted on contingency analysis [10][11][12][13]. It is known that obtaining all possible contingencies of the system is impractical, so the idea is to have a fast method that simulates as many contingencies as possible.…”

Section: Introductionmentioning

confidence: 99%

“…Ref [10] provides an overview of methods for steady-state security analysis in power systems, discussing full AC power flow, approximate methods, and contingency ranking, while emphasizing techniques to improve computational efficiency. An efficient method for selecting multiple contingencies using genetic algorithms with high accuracy is presented in [11]. Ref [12] focuses on computational efficiency in contingency analysis, proposing a novel approach that significantly reduces computation time by reusing symbolic factorization, yielding impressive results in power system security assessment.…”

Section: Introductionmentioning

confidence: 99%

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Post-Contingency Loading Margin through Plane Change in the Continuation Power Flow

dos Santos,

Bonini Neto,

Gabriel Filho

2023

Energies

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This paper introduces a parameterization technique to obtain complete P-V curves for electrical power systems under various conditions, including contingencies (N-1, N-1 severe, and N-2) as well as normal operating conditions N-0 (pre-contingency). The distinct feature of this methodology lies in the utilization of the new (θk, Vk) plane for constructing the P-V curve. In this new framework, the solution trajectory exhibits a linear characteristic in the vicinity of the maximum loading point (MLP), effectively mitigating any numerical challenges. Another crucial aspect is the point denoted as the center of the set of lines, point O (λ0, Vk0). This point can be adjusted along the ordinate axis, further enhancing the method’s ability to achieve a smoother ‘flat start’. The ‘flat start’ approach employed in the proposed methodology enables the determination of the loading margin for any system subjected to both simple and severe contingencies. Additionally, it facilitates the use of larger steps in acquiring complete P-V curves with a reduced number of iterations. A procedure presented is to not update the Jacobian matrix at each iteration but only when the system undergoes significant changes. This technique reduced the CPU Ratio by 29.74% in obtaining the P-V curve for all scenarios.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Post-Contingency Loading Margin through Plane Change in the Continuation Power Flow

dos Santos,

Bonini Neto,

Gabriel Filho

2023

Energies

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“…Contingency analysis is an analysis used to predict power flow and bus voltage conditions in the event of disturbances which include: transmission line outage, transformer outage, load outage, generator unit outage, capacitor/reactor outage, etc. [7] - [11]. Efforts to reduce the damages that occur due to these disturbances can be done by using a contingency analysis, because contingency analysis is an analysis to determine changes of power flow and changes of voltage for each bus when the transmission line is disconnected [12].…”

Section: Introductionmentioning

confidence: 99%

Study of Capacitor Placement to Improve the Voltage Profile in Contingency Conditions of the 150 kV Madura Electricity Power System

Sujito¹,

Falah²,

Faiz³

2021

Atlantis Highlights in Engineering

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The contingency is a very important issue in the electricity power system security. The contingency impact can change voltage, particularly the voltage drop on the load bus. This condition can have an impact on the quality of power supplied to the load, system reliability, and system security. The solution to overcome the voltage drop is to improve the voltage profile through the injection of reactive power sources into the system. This study focuses on improving the stress profile when a contingency occurs in the electricity power system. The stabilization profile is improved by placing the capacitor in distribution and centrally on the electricity power system. Newton Raphson method is used to determine the power flow and voltage on each bus normal and contingency conditions. The results showed that the worst undervoltage impact occurred in scenario 7 where the value of the Sumenep bus voltage decreased to 132.4 kV and the value of the bus voltage of Pamekasan was 131.8 kV. the centralized capacitor placement method is carried out on the Sumenep bus with an injection of a negative power of 24.93 MVAR. the centralized capacitor placement method can increase the bus voltage profile above the standard minimum value used. the distributed capacitor placement method is carried out by measuring the reactive power on each bus Sumenep 24.93 MVAR, Sampang 29.78 MVAR, Bangkalan 50.85 MVAR, Gilitimur 67.41 MVAR. The results of the voltage profile show that the voltages of all load buses are above the standard. The voltage standard used is the Regulation of the Minister of Energy and Mineral Resources CC2.0: 2007 with a minimum voltage limit of -10%.

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“…So that the power system can survive when an unsettling influence happens [4] - [6]. Interference in the electric power system is the discharge of one or more channels or components [7] - [9]. These disturbances can cause overload so that the electric power system cannot supply the power should the system stack [5], [10], [11].…”

Section: Introductionmentioning

confidence: 99%

Contingency Analysis on 150 kV Electricity Power System on The Madura Island Based on The 1P1Q Method

Falah¹,

Sujito²,

Wirawan³

2021

Atlantis Highlights in Engineering

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A major factor in the power system operation is the desire to maintain system security. System security involves a design to keep the system operating in the event of interference or failure. Interferences in electrical power systems are divided into generator, transmission, and load. Failure or interference of the transmission network results in a contingency of the transmission lines that can cause voltage in the bus and overload in the transmission lines, so it is very necessary to overcome the problem with a contingency analysis simulation to find solutions to problems caused by the disconnection of the transmission line. One of the contingency analysis methods is the 1P1Q (performance contingency index) method where the 1P1Q method lists the worst contingency impact on the electric power system to help engineers to solve problems and determine their next steps when contingencies occur. In the study, the Newton raphson's methods were used to determine the power flow in electrical systems at normal conditions or contingency. Calculating the value of the contingency index in times of interference or failure using the 1P1Q method. The results show that the worst impact or highest-ranking performance index for the Madura 150 kV electric power system occurs in the infinity-base scenario where two lines are overloaded and exceed the maximum value limit of the transmission line power of the infinity-gilitimur channel of 157.5 MW with a maximum value limit transmission line of 92,359 MW and gilitimur-bangkalan of 149 MW with a maximum value limit of transmission line of 88,616 MW. So there is prevention with load shedding of 87,638 MVA with scenario 6 in table 4:24 of load shedding on the bus Sampang, Sumenep, Pamekasan because by shedding loads of 95,528 MVA the power flowing at infinity-gilitimur becomes 72.9 MW.

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New genetic algorithms for contingencies selection in the static security analysis of electric power systems

Cited by 21 publications

References 25 publications

Post-Contingency Loading Margin through Plane Change in the Continuation Power Flow

Post-Contingency Loading Margin through Plane Change in the Continuation Power Flow

Study of Capacitor Placement to Improve the Voltage Profile in Contingency Conditions of the 150 kV Madura Electricity Power System

Contingency Analysis on 150 kV Electricity Power System on The Madura Island Based on The 1P1Q Method

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