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Preventive control approach for voltage stability improvement using voltage stability constrained optimal power flow based on static line voltage stability indices

Preventive control approach for voltage stability improvement using voltage stability constrained optimal power flow based on static line voltage stability indices Preventive control approach for voltage stability improvement using voltage stability constrained optimal power flow based on static line voltage stability indices Abstract: Voltage stability improvement is a challenging issue in planning and security assessment of power systems. As modern systems are being operated under heavily stressed conditions with reduced stability margins, incorporation of voltage stability criteria in the operation of power systems…

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Optimal Placement and Sizing Method to Improve the Voltage Stability Margin in a Distribution System Using Distributed Generation

Optimal Placement and Sizing Method to Improve the Voltage Stability Margin in a Distribution System Using Distributed Generation Optimal Placement and Sizing Method to Improve the Voltage Stability Margin in a Distribution System Using Distributed Generation Abstract: Recently, integration of distributed generation (DG) in distribution systems has increased to high penetration levels. The impact of DG units on the voltage stability margins has become significant. Optimization techniques are tools which can be used to locate and size the DG units in the system,…

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Optimal reactive power flow incorporating static voltage stability based on multi-objective adaptive immune algorithm

Optimal reactive power flow incorporating static voltage stability based on multi-objective adaptive immune algorithm Optimal reactive power flow incorporating static voltage stability based on multi-objective adaptive immune algorithm Abstract:- People have paid more attention to enhancing voltage stability margin since voltage collapses happened in some power systems recently. This paper proposes an optimal reactive power flow (ORPF) incorporating static voltage stability based on a multi-objective adaptive immune algorithm (MOAIA). The main idea of the proposed algorithm is to add two parts to an existing…

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Optimal placement of FACTS devices for multi-objective voltage stability problem

Optimal placement of FACTS devices for multi-objective voltage stability problem Optimal placement of FACTS devices for multi-objective voltage stability problem Abstract: In this paper, a new method for optimal locating multi-type FACTS devices in order to optimize multi-objective voltage stability problem is presented. The proposed methodology is based on a new variant of Particle Swarm Optimization (PSO) specialized in multi-objective optimization problem known as Non-dominated Sorting Particle Swarm Optimization (NSPSO). The crowding distance technique is used to maintain the Pareto front size at…

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Multi-objective VAr Planning with SVC for a Large Power System Using PSO and GA

Multi-objective VAr Planning with SVC for a Large Power System Using PSO and GA Multi-objective VAr Planning with SVC for a Large Power System Using PSO and GA Abstract: Particle swarm optimization (PSO) algorithm is used for planning the static VAr compensator (SVC) in a large-scale power system. The primary function of an SVC is to improve transmission system voltage, thereby enhancing the maximum power transfer limit. To enhance voltage stability, the planning problem is formulated as a multiobjective optimization problem for maximizing fuzzy…

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Multi-objective Optimization of Power System Performance with TCSC Using the MOPSO Algorithm

Multi-objective Optimization of Power System Performance with TCSC Using the MOPSO Algorithm Multi-objective Optimization of Power System Performance with TCSC Using the MOPSO Algorithm Abstract:  In this paper, multi-objective particle swarm optimization (MOPSO) algorithm is used to find the optimal location of thyristor controlled series compensator (TCSC) and its parameter in order to increase total transfer capability (TTC), reduce total transmission losses and reduce voltage deviation. This multi-objective optimization problem is solved by using the MOPSO with sigma method and encouraging results are…

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On-line voltage stability based contingency ranking using fast voltage stability index (FVSI)

On-line voltage stability based contingency ranking using fast voltage stability index (FVSI) On-line voltage stability based contingency ranking using fast voltage stability index (FVSI) Abstract: Voltage instability is one phenomenon that could happen in a power system due to its stressed condition. The result would be the occurrence of voltage collapse which leads to total blackout to the whole system. Therefore voltage collapse prediction is important in power system planning and operation so that the occurrence of voltage collapse due to voltage instability…

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Technique for contingency monitoring and voltage collapse prediction

Technique for contingency monitoring and voltage collapse prediction Technique for contingency monitoring and voltage collapse prediction Abstract: Investigation and online monitoring of power system stability have become vital factors to electric utility suppliers. At present power system utilities operate very close to the limit of system stability owing to an increasing number of new economic and environmental restrictions. Researchers have been trying to find out the most effective way for online system status monitoring, so that necessary precautions can be taken prior to…

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A Comparison of Voltage Stability Indices for Placing Shunt FACTS Controllers

A Comparison of Voltage Stability Indices for Placing Shunt FACTS Controllers A Comparison of Voltage Stability Indices for Placing Shunt FACTS Controllers Abstract: Location of shunt compensation devices is important for the enhancement of the voltage stability for practical power systems. This paper presents a comparison of several voltage stability indices in electric power system to identify the weakest bus/ area of the system. Shunt FACTS controller is introduced at the weakest bus in IEEE 14-bus test system and its effectiveness is assessed…

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Estimating the Voltage Stability Margin Using PMU Measurements

Estimating the Voltage Stability Margin Using PMU Measurements Estimating the Voltage Stability Margin Using PMU Measurements Abstract:- This paper presents a new method based on phasor measurement units (PMUs) for the estimation of voltage stability margin in a power system to increase operator's situational awareness. The method assumes a PMU measurement preprocessing technique as a priori in order to eliminate data inconsistency and uncertainty caused by random load disturbances. The measurements are then used in the computation of voltage stability margin based on the…

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