A Real-Time Voltage Instability Identification Algorithm Based on Local Phasor Measurements

Corsi, S.; Taranto, G.N.

doi:10.1109/tpwrs.2008.922586

Cited by 263 publications

(203 citation statements)

References 6 publications

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“…So, the problem lies mainly in the nonlinearity of the load/generation injections. Using a TE several voltage stability indices have been developed [1][2][3]. In [1], loads and generators are replaced by equivalent static shunt admittance and the diagonal elements of the system bus impedance matrix, Z bus , are considered the equivalent Thevenin impedances, Z th , of the corresponding buses.…”

Section: Introductionmentioning

confidence: 99%

“…Z th is then compared with load impedance to determine the proximity of the system to voltage collapse. The same approach has been recently used in [2] but with Z th calculated from local measurements. Multiple power flow solutions were used in [3] to determine a TE for the system at the weak nodes, which is then used to determine a voltage collapse proximity indicator.…”

Section: Introductionmentioning

confidence: 99%

“…Local measurements using PMUs provide voltage and current phasors at rates as high as 1 measurement/cycle. The works of [2] tried to use one local measurement to determine a TE equivalent through making many assumptions such as neglecting the TE resistance, which cannot be justified at the voltage levels where the wind farms are usually connected. This paper presents a new method for the determination of TE based on PMU measurements.…”

Section: Introductionmentioning

confidence: 99%

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Online Thevenin’s Equivalent Using Local PMU Measurements

Abdelkader¹

2024

RE&PQJ

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Abstract. This paper presents a method for determiningThevenin's Equivalent (TE) for a node in a power system using local PMU measurements at that node. Three consecutive voltage and current measurements are used to determine the TE. The proposed method recognizes and considers the phase angle drift caused by the slip frequency between the PMU sampling frequency and the power system frequency. The accuracy of the proposed method has been verified through application to the IEEE 30 bus test system as well as to a real system data measured at the terminals of a wind farm. The proposed method is going to be used to determine an online TE, which will be used to monitor the system capability to accommodate the wind power by updating a capability chart of the system at the node where the wind farm is connected.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Online Thevenin’s Equivalent Using Local PMU Measurements

Abdelkader¹

2024

RE&PQJ

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“…In [9], TE is calculated by generator voltage and current phasors for designing an adaptive voltage regulator. In [10], an initial estimation of TE from a load terminal is established. It then converged to exact value using an incrementally based algorithm depending on the load impedance variations recorded by PMUs.…”

Section: Introductionmentioning

confidence: 99%

Power System Thévenin Equivalent Estimation Based on Phasor Measurements

Osbouei

Karegar

2017

Scientia Iranica

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This paper presents a novel algorithm based on phasor measurements to online estimation of power system Thévenin Equivalent (TE) from a generator terminal. Three consecutive phasor measurements of generator terminal voltage and current are used to estimate the system TE. In a real network, system frequency deviation from its nominal value will produce some phase drift in consecutive phasors reported by Phasor Measurements Units (PMUs). To correct the phase drift and synchronizing the reported phasors to the same reference, an improved triangulation method is developed. The improved method uses a virtual vector in its structure. Using this vector alleviates the negative impacts of improper data resulting from noise or disturbances which make the simple triangulation method to be useless. The algorithm is tested on standard NE-39 network and is implemented in Shahid Beheshti University (SBU) protection laboratory to verify the results in a practical area. The obtained results show that the new method can efficiently estimate the in online mode in steady-state and transient conditions.

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“…In view of this, a variety of methods have been proposed for static voltage security analysis, such as sensitivity methods [6,7], continuation power flow (CPF) methods [8,9], and impedance match methods [10][11][12][13][14][15]. Indeed, the Power-Voltage (P-V) curve is widely utilized for voltage stability analysis.…”

Section: Introductionmentioning

confidence: 99%

A PMU-Based Method for Smart Transmission Grid Voltage Security Visualization and Monitoring

Liu

2017

Energies

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Abstract:With the rapid growth of usage of phasor measurement units (PMUs) for modern power grids, the application of synchronized phasors (synchrophasors) to real-time voltage security monitoring has become an active research area. This paper presents a novel approach for fast determination of loading margin using PMU data from a wide-area monitoring system (WAMS) to construct the voltage stability boundary (VSB) of a transmission grid. Specifically, a new approach for online loading margin estimation that considers system load trends is proposed based on the Thevenin equivalent (TE) technique and the Mobius transformation (MT) technique. A VSB is then computed by means of real-time PMU measurements and is presented in a complex load power space. VSB can be utilized as a visualization tool that is able to provide real-time visualization of the current voltage stability situation. The proposed method is fast and adequate for online voltage security assessment. Furthermore, it enables us to significantly increase a system operator's situational awareness for operational decision making. Simulation studies were carried out using different sized power grid models under various operating conditions. The simulation results are shown to validate the capability of the proposed method.

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A Real-Time Voltage Instability Identification Algorithm Based on Local Phasor Measurements

Cited by 263 publications

References 6 publications

Online Thevenin’s Equivalent Using Local PMU Measurements

Online Thevenin’s Equivalent Using Local PMU Measurements

Power System Thévenin Equivalent Estimation Based on Phasor Measurements

A PMU-Based Method for Smart Transmission Grid Voltage Security Visualization and Monitoring

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