scholarly journals Analyzing Six Indices for Online Short-Term Voltage Stability Monitoring in Power Systems

2020 ◽  
Vol 10 (12) ◽  
pp. 4200
Author(s):  
Milad Aslanian ◽  
Mohammad Esmaeil Hamedani-Golshan ◽  
Hassan Haes Alhelou ◽  
Pierluigi Siano
Keyword(s):  
Power Systems ◽  
Voltage Stability ◽  
Online Monitoring ◽  
Voltage Drop ◽  
Measurement Unit ◽  
Short Term ◽  
Stability Monitoring ◽  
Voltage Transients ◽  
Fast Dynamic ◽  
Special Algorithm

In recent years, the importance of online monitoring short-term voltage stability has been considerably increased. Unstable cases due to response of fast dynamic loads such as induction motors to the serious disturbances can be avoided by online monitoring of voltage transients and activating fast and appropriate controls to encounter deep and prolonged voltage drop. In this paper, a set of indices based on the phasor measurement unit (PMU) measurements are introduced and compared for short-term voltage stability. To increase efficiency of the indices, a special algorithm for each index is proposed by using the investigation of the results of applying them to six disturbances’ scenarios simulated on the IEEE 39 bus system. The disturbance scenarios are representative of different cases of stable, unstable, and deep and prolonged voltage drop associated with short-term voltage transients. The performance of these indices are studied in terms of the time and accuracy required for determining the short-term voltage stability/instability cases. It is shown that the proposed method has better performance in comparison with other techniques that can be applied to power systems in reality.

scholarly journals Online Static Voltage Stability Monitoring for Power Systems Using PMU Data

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Jianhong Pan ◽  
Aidi Dong ◽  
Jiashu Fan ◽  
Yang Li
Keyword(s):  
Power Systems ◽  
Power Flow ◽  
Voltage Stability ◽  
Jacobian Matrix ◽  
Singular Values ◽  
Test System ◽  
Measurement Unit ◽  
Monitoring Method ◽  
Static Voltage Stability ◽  
Stability Monitoring

A new online static voltage stability monitoring method for power systems is proposed by using phasor measurement unit (PMU) data in this paper. This approach uses the real-time power, voltage, and phase angle data collected by the PMU to estimate the power flow Jacobian matrix of the system, and then the static voltage stability is monitored via the minimum singular values (MSVs) of the power flow Jacobian matrix. The novelty of the approach lies in the fact that it only utilizes PMU data for implementing online monitoring of the power system static voltage stability, independent of the physical model and its parameters. The application results on the IEEE 57-bus test system verify the effectiveness of the proposed approach.

scholarly journals A Review of Data-Driven Short-Term Voltage Stability Assessment of Power Systems: Concept, Principle, and Challenges

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Jiting Cao ◽  
Meng Zhang ◽  
Yang Li
Keyword(s):  
Power Systems ◽  
Voltage Stability ◽  
Power Transmission ◽  
Power Market ◽  
Power Grids ◽  
Data Driven ◽  
Stable Operation ◽  
Fast Recovery ◽  
Short Term ◽  
Air Conditioners

With the rapid growth of power market reform and power demand, the power transmission capacity of a power grid is approaching its limit and the secure and stable operation of power systems becomes increasingly important. In particular, in modern power grids, the proportion of dynamic loads with fast recovery characteristics such as air conditioners, refrigerators, and industrial motors is increasing. As well as there is an increasing proportion of different forms of renewable energy in power systems. Therefore, the short-term voltage stability (STVS) of power systems cannot be ignored. This article comprehensively sorts out the STVS problems of power systems from the perspective of data-driven methods and discusses existing challenges.

Online Assessment of Voltage Stability in Power Systems with PMUs

2013 ◽  
Vol 14 (2) ◽  
pp. 115-122 ◽  
Author(s):  
Prasad Bhagwat Chitare ◽  
V.S.K. Murthy Balijepalli ◽  
S.A. Khaparde
Keyword(s):  
Power Systems ◽  
Voltage Stability ◽  
Reactive Power ◽  
Online Assessment ◽  
Reactive Component ◽  
Maximum Increase ◽  
Stability Monitoring ◽  
Voltage Instability ◽  
Source Current ◽  
Early Indication

Abstract: For the assessment of voltage instability which comprises the detection of voltage instability and identification of critical buses, two indices namely, system wide Qtax, and bus-specific qtax, are proposed. The Qtax, based on the sensitivity of the reactive power injections to the loading in the system provides early detection of impending voltage instability. The computed qtax indices identify the critcal buses among the load buses in the system. The identified critical buses provided optimal lacations for the corrective control actions for averting voltage instability. Additionally, for voltage stability monitoring, determining the poing of exhaustion of the reactive reserves in system is also crucial. This is addressed by proposed Q-Monitoring Index (QMI), which is the ratio of the reactive component of the source current to the sink current that flows through the adjacent transmission line. These proposed indices together can provide early indication to impending voltage instability. This has been illustrated on IEEE-39 bus system. The reactive support on identified critical buses results in maximum increase in the loadability of the system.

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