A study on voltage collapse mechanism in electric power systems

Lee, B.H.; Lee, K.Y.

doi:10.1109/59.119236

Cited by 70 publications

(20 citation statements)

References 13 publications

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“…Various events commenced by voltage instability and induced to voltage collapse were reported in many regions of the world (Lee and Lee, 1991). One of the local issues experienced in Malaysia was the major blackout event in 13 January 2005 and ultimately enforced the local authority to shed some of the load to balance the demands (Vaiman et al, 2012).…”

Section: Voltage Stability Assessmentmentioning

confidence: 99%

Comparative Study of Different Kalman Filter Implementations in Power System Stability

Goh¹

2014

American Journal of Applied Sciences

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Voltage stability and voltage collapse issues have in recent years begun to constitute an unpleasant warning to the operational security of power systems. Many techniques have been investigated in order to predict the point of voltage collapse. However, there are still several restrictions due to the insufficiency of current system state information. Accompanied by the commencement of the Phasor Measurement Units (PMUs) evolving technology, it donates a solution to enhance the existing power system state estimation. In consequence, the significances to develop preferable methods that would provide a preliminary warning before the voltage collapse had grabbed the attention. This study covers the forming of real-time system monitoring methods that able to provide a timely warning in the power system. The algorithms used to estimate the points of collapse are according to the theory that voltage instability is approximately linked to the maximum load ability of a transmission network. As a result, the critical operating conditions (peak of maximum deliverable power) come when the system Thevenin impedance is equal to the load impedance. This study focuses specifically on research about the motivation and the application of different Kalman filter implementations such as Discrete Kalman Filter (DKF), Extended Kalman Filter (EKF) and Unscented Kalman Filter (UKF) are used to track the Thevenin parameters. Therefore, the implications of this research paper are to determine the robustness and reliability of the proposed tracking methods. As compared to previous studies, the tracking process is just mainly focused on DKF method only, while the novelty throughout this study is to compare the performances and efficiencies of different Kalman filters in determining the maximum load ability on the 2 different types of test systems. Accompanying, the parameters are utilized in real-time voltage instability estimator to discover the current system's condition. In this study, the effectiveness of the proposed algorithms is assessed under a large number of random operating conditions on the Malaysia's power system 132 kV, 2-bus and 10-bus systems. Eventually, the results are differentiated by using the early-warning index of voltage collapse. All through the test cases, EKF method shows the best ability to track the Thevenin parameters as compared to DKF and UKF. Last but not least, the earlywarning index acted as a pioneer implication in estimating the maximum load power ability of the power system right before load shedding methods are being executed.

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Section: Voltage Stability Assessmentmentioning

confidence: 99%

Comparative Study of Different Kalman Filter Implementations in Power System Stability

Goh¹

2014

American Journal of Applied Sciences

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“…Figure 9 shows the magnitude of fault currents in both cases using the diagonal of the impedance matrix (2) and (4) with the bus voltages of Figure 4. The calculation of the transient bus voltages during fault are given in Tables 2 and 3.…”

Section: Short Circuit Investigationmentioning

confidence: 99%

“…These values are given in the network of Figure 3. Admittance and impedance matrices can be easily obtained, as in (1), (2), (3), (4).…”

Section: Power Grid Modelmentioning

confidence: 99%

“…Bus admittance matrix without distributed generator (1) Bus impedance matrix without distributed generator (2) Bus admittance matrix with distributed generator…”

Section: Power Grid Modelmentioning

confidence: 99%

“…The phenomenon of bus voltage collapse due to a dynamic load in the power network is analyzed by simple power system model [2]. This voltage instability can also be analyzed by transferring the system model into a singular perturbation theory and solved by numerical investigation [3].…”

Section: Introductionmentioning

confidence: 99%

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Power Analysis for a Limited Bus Grid System with Distribution Generators

Barsoum¹

2017

Global J Technol Optim

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It has been recognized recently that when injecting renewable energy source power to a load buses which connected to some distributed feeders in a power grid system, a stability problem occurs particularly when having high fault duties that exceeding the circuit breaker ratings at some substations. In this paper an analysis of power flow, short circuit, stability and protection are given in detail to an example of limited 7-bus power grid system. Comparison are illustrated between power grid with and without distributed generators regarding bus voltages, fault currents, critical power angles, selected current transformers and over current relay settings in each bus. It discusses the selection of optimum slack bus in Gauss Seidel method, and shows that the system with distributed generators is more stable although the fault currents are higher than the system without distributed generators.

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Voltage Instability Indicators

Corsi

2015

Voltage Control and Protection in Electrical Power Systems

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A study on voltage collapse mechanism in electric power systems

Cited by 70 publications

References 13 publications

Comparative Study of Different Kalman Filter Implementations in Power System Stability

Comparative Study of Different Kalman Filter Implementations in Power System Stability

Power Analysis for a Limited Bus Grid System with Distribution Generators

Voltage Instability Indicators

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