Improving Voltage Stability by Reactive Power Reserve Management

Department of Electrical and Computer Engineering, University of Missouri, Columbia, Missouri, United States
Power Systems, IEEE Transactions on 03/2005; 20(1):338 - 345. DOI: 10.1109/TPWRS.2004.841241
Source: IEEE Xplore


The amount of reactive reserves at generating stations is a measure of the degree of voltage stability. With this perspective, an optimized reactive reserve management scheme based on the optimal power flow is proposed. Detailed models of generator limiters, such as those for armature and field current limiting must be considered in order to utilize the maximum reactive power capability of generators, so as to meet reactive power demands during voltage emergencies. Participation factors for each generator in the management scheme are predetermined based on the voltage-var (V-Q) curve methodology. The Bender's decomposition methodology is applied to the reactive reserve management problem. The resulting effective reserves and the impact on voltage stability are studied on a reduced Western Electric Coordinating Council system. Results prove that the proposed method can improve both static and dynamic voltage stability.

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    • "Reactive power reserve management is a method for voltage stability margin, based on the optimal power flow [9]. Participation factor for each generator is calculated on the basis of Q-V curve methodology. "

    Preview · Article · Nov 2015
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    • "Automatic Voltage Control (AVC) system has been applied as a means for controlling voltage and adjusting reactive power because it has many special excellences [4] [5] [6] [7] [8] . "
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    ABSTRACT: Proposing the optimal AVC coordinating parameters and comparing effects of different grid planning for reactive balance in an scientific manner is one of the functional characteristics of smart AVC. In this paper Optimization Parameter (OP) system is developed in Hebei low voltage grid for this purpose. The data are taken from EMS. The state estimation is carried out periodically after obtaining real-time data. Taking state estimation results as the basic power flow and simulating AVC operations, the voltage variations and line loss analysis can be calculated for comparison. The system can compare optimization parameters for the real grid or the virtual grid. It's depending on whether considering the actual capacity of reactive power compensation equipments. The structure, hardware configuration and data exchange of the system are illustrated. Finally, several analysis tools of the OP system are introduced. With the system, it can be evaluated that effects of reducing line loss benefited from the AVC operations. It can propose coordinating priority of capacitors or on-load regulating transformers. Also it can provide the optimal AVC coordinating parameters and the optimal grid plans, which lead to better voltage control and better layout of reactive power compensation equipments.
    Preview · Article · Sep 2014
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    • "This paper studies the effect of the GVM (of all generating units) on fault duration causing voltage instability, when a 3-phase short circuit occurs at certain load bus, with different types of loads. Also, studies the effect of the all GVM on the fault duration causing voltage collapse, when opening line between two buses in the studied system, with different types of loads [22] [23] [24] [25] "

    Full-text · Article · May 2012
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