Assessment on various node voltage stability indices — A review
01 Aug 2017-
TL;DR: A review on Node Voltage Stability Indices with respect to approach, values at critical point, deviation from critical point value, accuracy and response at different power factors via graphical means using MATLAB 8.0R 2012b environment.
Abstract: With the surge in demand for electrical energy and the consequent need to operate the power system close to its limits, the need to compute the voltage stability limit and the system's proximity to this limit has become mandatory. Among the methods to compute these parameters, the Voltage Stability Indices stand out owing to their attributes of simplicity and minimal computational effort and have also served varied applications. This paper presents a review on Node Voltage Stability Indices with respect to approach, values at critical point, deviation from critical point value, accuracy and response at different power factors via graphical means. The results and conclusions presented in this paper have been arrived at by performing the computations on IEEE 30 Bus system on MATLAB 8.0R 2012b environment.
Citations
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TL;DR: In this article , the authors proposed a more accurate voltage collapse prediction for identifying weak buses and critical lines based on a new proposed index termed Modern Voltage Stability Index (MVSI), which ignores the line resistance partially and not entirely of the exact formula of the system to develop an approximate and fast collapse prediction index.
5 citations
TL;DR: In this paper , a Critical Voltage-Reactive Power Ratio (CVQR) index was proposed to assess the voltage instability tendencies of power system buses with an increase in renewable energy (RE) penetration within the power system.
Abstract: Abstract This paper presents a QV-based approach called Critical Voltage-Reactive Power Ratio (CVQR) index to assess the voltage instability tendencies of power system buses with increase in renewable energy (RE) penetration within the power system. The buses are thus ranked according to the order in which they are impacted by increase in renewable energy penetration. Simulations were performed using DIgSILENT PowerFactory and result analyses were done with MATLAB. The developed CVQR index has been employed to assess the effect of increasing RE generation on grid voltage stability. This index provides information on the voltage instability tendencies of all non-slack buses of the RE-integrated grid and the buses are ranked from the weakest to the strongest. The rankings obtained from the developed CVQR has been compared with five commonly-used indices and the result of the comparison verifies the accuracy of the proposed index. IEEE 14-bus and IEEE 39-bus New England systems have been used to evaluate the proposed CVQR index and various scenarios of RE system combinations and placements have been considered. Voltage collapse condition is indicated whenever the CVQR index associated with any bus becomes positive (CVQR > 0). This index can as well be applied to other power system networks. The overall ranking of the buses based on the CVQR index can provide insights on the most appropriate location for large inductive loads or compensating devices, which can either absorb or inject reactive power into the power system, thereby influencing the system’s voltage stability.
References
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TL;DR: In this article, a method for the online testing of a power system is proposed which is aimed at the detection of voltage instabilities, and an indicator L is defined which varies in the range between 0 (noload of system) and 1 (voltage collapse).
Abstract: A method for the online testing a power system is proposed which is aimed at the detection of voltage instabilities. Thereby an indicator L is defined which varies in the range between 0 (noload of system) and 1 (voltage collapse). Based on the basic concept of such an indicator various models are derived which allow to predict a voltage instability or the proximity of a collapse. The indicator uses information of a normal load flow. The advantage of the method lies in the simplicity of the numerical calculation and the expressiveness of the result.
1,012 citations
16 May 2006
TL;DR: In this paper, some important aspects related to voltage stability indices in electric power systems are discussed and a comparison of the performance of several indices is presented through numerical studies in IEEE 14 busbar test system, using several different scenarios of load increase.
Abstract: Voltage stability has become a very important issue of power systems analysis. This paper discusses some important aspects related to voltage stability indices in electric power systems. Some techniques previously studied in the literature are analyzed and a comparison of the performance of several indices is presented. The effectiveness of the analyzed methods are demonstrated through numerical studies in IEEE 14 busbar test system, using several different scenarios of load increase.
153 citations
"Assessment on various node voltage ..." refers background in this paper
...None of the research presented in [8-11] has presented a comparison exclusively between node voltage indices....
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...In [8], the author has compared several voltage stability indices....
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TL;DR: In this paper, an equivalent node voltage collapse index (ENVCI) is proposed to identify the weakest node (bus) causing system instability and the system voltage collapse point when it is near zero.
111 citations
"Assessment on various node voltage ..." refers background in this paper
...The simplicity of ENVCI arises from the fact that it can be calculated by simple measurement of voltage phasors [2]....
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...[2] Yang Wang, Wenyuan Li, Jiping Lu, A new node voltage stability index based on local voltage phasors, Electric Power Systems Research (June(18))(2008)265-271 [3] Javad Modaressi, Eskandar Gholipour, Amin Khodabakhshian, A comprehensive review of the voltage stability indices, Renewable and Sustainable Energy Reviews (May(3)) (2016)1-12 [4] L....
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...Voltage instability is a local phenomenon which gradually spreads across the system and has its roots in the inability of the system to supply adequate reactive power [1, 2]....
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...ENVCI holds several advantages in terms of simplicity in calculation, real time application and accuracy as explained in [2]....
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...The accuracy stems from its inclusion of the external network in addition to the immediate local network of the bus at which voltage stability is being monitored [2]....
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Proceedings Article•
01 Jan 2007
TL;DR: A simple method of determining the distance to voltage collapse using some local information such as bus voltage magnitude and load current magnitude and the results are compared with the corresponding actual values found through repetitive power flow simulations and are observed to be in very good agreement.
46 citations
"Assessment on various node voltage ..." refers background or methods in this paper
...It can be seen in [6] that equation (4) is the original formula which is arrived at....
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...The VSI index is proposed by Haque in [6]....
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01 Dec 2007
TL;DR: In this paper, the authors proposed a simple method of determining the distance to voltage collapse using some local information such as bus voltage magnitude and load current magnitude, which is carefully processed to establish a voltage stability index (VSI) that varies almost linearly with load.
Abstract: This paper proposes a simple method of determining the distance to voltage collapse using some local information such as bus voltage magnitude and load current magnitude First the voltage and current information are carefully processed to establish a voltage stability index (VSI) that varies almost linearly with load The VSI is then used to estimate the distance to voltage collapse using linear extrapolation The effects of generator reactive power limits, line tripping, non-uniform increase in load and additional shunt reactive power sources on the VSI are also investigated The effectiveness of the proposed method of determining the distance to voltage collapse is then tested on the IEEE 30-bus system The results obtained by the proposed method are also compared with the corresponding actual values found through repetitive power flow simulations and are observed to be in very good agreement
44 citations