Specifying angular reference for three‐phase distribution system state estimators

Silva, Rafael Schincariol da; Fernandes, Thiago Ramos; Almeida, Madson C. de

doi:10.1049/iet-gtd.2017.0860

Cited by 24 publications

(12 citation statements)

References 26 publications

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“…State estimation in distribution systems requires considering three-phase voltage phase angles at the reference bus due to their unbalanced nature. While current solutions typically involve modeling to determine these angles [33,34], this paper proposes relying on measurements to obtain these variables. Discrete Fourier transform (DFT) or any other phasor estimation method can be applied to the measured signal of three-phase voltages at the reference bus.…”

Section: A Obtaining Voltage Phase Angles Of the Reference Busmentioning

confidence: 99%

“…Considering balanced voltage phase angles for the reference bus might decrease the accuracy of the estimator. The use of a virtual reference bus is an alternative solution for this problem in the literature [33,34]. However, as described in Section III, the phase angles of voltage phasors at the reference bus can be directly calculated.…”

Section: B Dealing With the Reference Bus Voltage Phase Anglesmentioning

confidence: 99%

“…A trivial approach for addressing this challenge is the assumption of balanced voltage phase angles for the reference bus. Defining a virtual reference bus is proposed in [33,34] as another approach to this challenge. The introduction of uncertainties in the modeling process by these approaches may lead to biased or inaccurate results.…”

Section: Introductionmentioning

confidence: 99%

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Fast Linear State Estimation for Unbalanced Distribution Systems Using Hybrid Measurements

Nassaj,

Jahromi,

et al. 2024

IEEE Trans. Instrum. Meas.

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Distribution system state estimation (DSSE) is traditionally solved iteratively using unsynchronized measurements provided by the SCADA system and/or smart meters. This paper puts forward a decoupled linear state estimation method for unbalanced distribution systems. Contrary to conventional methods, the proposed linear DSSE (LDSSE) method can function with purely unsynchronized or hybrid synchronized/unsynchronized measurements. In the case of purely unsynchronized measurements, the voltage phase angles of the reference bus are acquired through local measurements. In the first stage, the proposed LDSSE method estimates the voltage phase angles in terms of network parameters and available measurements. These are referred to as pseudo-synchronized voltage phase angles, which establish a basis for deriving pseudosynchronized voltage/current phasors. In the second stage, a set of linear equations are derived for each phase separately. Solving these equations results in estimates for voltage phasors. The linearity and decoupled nature of the proposed LDSSE method significantly reduce the computation time without impacting the accuracy of estimates. The superiority of the proposed LDSSE method over existing methods is verified using extensive simulations conducted on several test feeders, delivering results 20 times faster than the nonlinear DSSE on the 8500-bus test feeder.

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Section: A Obtaining Voltage Phase Angles Of the Reference Busmentioning

confidence: 99%

Section: B Dealing With the Reference Bus Voltage Phase Anglesmentioning

confidence: 99%

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Fast Linear State Estimation for Unbalanced Distribution Systems Using Hybrid Measurements

Nassaj,

Jahromi,

et al. 2024

IEEE Trans. Instrum. Meas.

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“…Alternatively, the slack bus can be modelled as a balanced threephase voltage source behind an equivalent impedance that represents the system upstream the distribution substation [35]. Resultantly, the three-phase voltages at the substation bus will be unbalanced according to the imbalances of the distribution system.…”

Section: Slack Busmentioning

confidence: 99%

Contributions to the sequence‐decoupling compensation power flow method for distribution system analysis

Fernandes¹,

Ricciardi²,

Silva³

et al. 2019

IET Generation, Transmission & Distribution

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“…When the measurements in polar coordinates obtained from the PMUs are converted into the rectangular coordinates, and the power measurements are converted into the equivalent current measurements, the measurement error transmission is involved. The covariance of equivalent measurements [35] can be obtained through measurement correlation, and the covariance matrix of the branch current measurements in rectangular coordinate can be expressed as Equation 6:…”

Section: State Variables and Measurement Equations In Robust State Esmentioning

confidence: 99%

A Hybrid State Estimator Based on SCADA and PMU Measurements for Medium Voltage Distribution System

Kong

Chen

et al. 2018

Applied Sciences

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With the increasing importance of renewable energy and flexible loads, the operation of the distribution system is becoming more stochastic and complex, and it is necessary to monitor the power system in real-time. Considering the gradual applications of intelligent electronic devices in the distribution systems, a hybrid state estimator based on supervisory control and data acquisition (SCADA) and phasor measurement unit (PMU) measurements is proposed in this paper, which consists of the improved robust estimation and linear state estimation. At the time of SCADA data acquisition, the improved robust estimation combining the SCADA measurements with PMU measurements is performed. To eliminate the effect of bad data, the internal student residual method is introduced, and the robust thresholds are adjusted adaptively. Then the linear state estimation is performed at the time of PMU data acquisition based on the results of the previous estimation time and the PMU measurements, which can quickly correct the robust estimation results and track the changes of the distribution system. Finally, the effectiveness and performance of the proposed method are verified in a modified IEEE 33-bus distribution system and a real distribution system in China.

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Specifying angular reference for three‐phase distribution system state estimators

Cited by 24 publications

References 26 publications

Fast Linear State Estimation for Unbalanced Distribution Systems Using Hybrid Measurements

Fast Linear State Estimation for Unbalanced Distribution Systems Using Hybrid Measurements

Contributions to the sequence‐decoupling compensation power flow method for distribution system analysis

A Hybrid State Estimator Based on SCADA and PMU Measurements for Medium Voltage Distribution System

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