Contingency selection via quadratized power flow sensitivity analysis

Heuristic methods by first order sensitivity analysis are often used to determine location of capacitors of distribution power system. The selected nodes by first order sensitivity analysis often have virtual high by first order sensitivities, which could not obtain the optimal results. This paper presents an effective method to optimally determine the location and capacities of capacitors of distribution systems, based on an innovative approach by the second order sensitivity analysis and hierarchical clustering. The approach determines the location by the second order sensitivity analysis. Comparing with the traditional method, the new method considers the nonlinear factor of power flow equation and the impact of the latter selected compensation nodes on the previously selected compensation location. This method is tested on a 28-bus distribution system. Digital simulation results show that the reactive power optimization plan with the proposed method is more economic while maintaining the same level of effectiveness.

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Sensitivity Based Approach for Transmission Congestion Management Utilizing Bids for Generation Rescheduling and Load Curtailment

International Journal of Emerging Electric Power Systems ◽

10.2202/1553-779x.1357 ◽

2006 ◽

Vol 7 (4) ◽

Cited By ~ 4

Author(s):

Himanshu Kumar Singh ◽

S.C. Srivastava ◽

Ashwani Kumar Sharma

Keyword(s):

Electricity Markets ◽

Power Flow ◽

Reactive Power ◽

Congestion Management ◽

Test System ◽

Hyperbolic Function ◽

Flow Sensitivity ◽

Fair Competition ◽

Load Curtailment ◽

The Impact

One of the most important tasks of System Operator (SO) is to manage congestion as it threatens system security and may cause rise in electricity price resulting in market inefficiency. In corrective action congestion management schemes, it is crucial for SO to select the most sensitive generators to re-schedule their real and reactive powers and the loads to curtail in extreme congestion management. This paper proposed the selection of most sensitive generators and loads to re-schedule their generation and load curtailment based on the improved line flow sensitivity indices to manage congestion. The impact of slack bus on power flow sensitivity factors has been determined to encourage fair competition in the electricity markets. Effect of bilateral and multilateral transactions, and impact of multi-line congestion on congestion cost has also been studied. The generators reactive power bid has been modeled by a continuous differentiable tangent hyperbolic function. The proposed concept of congestion management has been tested on a practical 75-bus Indian system and IEEE-118-bus test system.

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PMU placement method based on decoupled newton power flow and sensitivity analysis

2007 9th International Conference on Electrical Power Quality and Utilisation ◽

10.1109/epqu.2007.4424116 ◽

2007 ◽

Cited By ~ 4

Author(s):

G. Mueller ◽

P. Komarnicki ◽

I. Golub ◽

Z. Styczynski ◽

C. Dzienis ◽

...

Keyword(s):

Sensitivity Analysis ◽

Power Flow ◽

Placement Method ◽

Pmu Placement

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Analysis and Improvement of the Power Flow Transferring Identification Method Based on DC Sensitivity Factors

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1070-1072.666 ◽

2014 ◽

Vol 1070-1072 ◽

pp. 666-670

Author(s):

Xu Yan ◽

Han Ping ◽

Chi Cheng

Keyword(s):

Power Flow ◽

Active Power ◽

Distance Protection ◽

Identification Scheme ◽

Flow Sensitivity ◽

Identification Method ◽

Sensitivity Factors ◽

Simulation Results ◽

Bus System

Research on the power flow transferring identification method based on DC sensitivity factors is carried out. According to the analysis of transfer power flow sensitivity factors matrix, the disadvantage of this method is proposed that it may identify incorrectly due to the only criterion of active power when fault occurs. In order to improve its performance, the criterion of impedance angle is put forward. The combination of the two criteria is applied to the improved flow transferring identification scheme. The improved scheme can identify non-faulted overload reliably and block zone 3 distance protection to prevent cascading trips effectively. The simulation results of IEEE 10-machine 39-bus system have proved its superiority and practicality.

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