Impact of synchrophasor measurement types and uncertainties on the accuracy of distribution system linear state estimators

Zanni, Lorenzo; Colangelo, Daniele; Cherkaoui, Rachid; Paolone, Mario

doi:10.1109/ptc.2015.7232766

Cited by 6 publications

(4 citation statements)

References 19 publications

(17 reference statements)

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“…[19], [20]) provide some general rules, following gained experience. Recently, some papers (for instance [21], [22]) carried out numerical investigations on the impact of PMUs in the context of DSSE, with different approaches. However, a clear idea on how number, location and features of the used measurements affect the accuracy of the DSSE results is in general missing.…”

Section: Introductionmentioning

confidence: 99%

Uncertainty of Voltage Profile in PMU-Based Distribution System State Estimation

Muscas

Pau

Sulis

2016

IEEE Trans. Instrum. Meas.

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Distribution system state estimation (DSSE) tools are required to estimate the real operating conditions of power distribution networks. The accuracy of the quantities estimated through DSSE plays a key role in the effectiveness of the management and control functions. This paper presents a comprehensive mathematical analysis aimed at highlighting the most important factors affecting the accuracy of the voltage profile obtained by means of weighted least squares estimators. The proposed analysis shows the way in which the uncertainty components of the voltage estimations depend on the measurement system available on the field. In particular, this paper considers synchrophasor measurements provided by phasor measurement units and hybrid measurement systems also presenting conventional devices. Tests performed on a 95-bus network prove the validity of the theoretical analysis and show the importance of the results also from a meter placement perspective, emphasizing the requirements needed to achieve specific accuracy targets

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Section: Introductionmentioning

confidence: 99%

Uncertainty of Voltage Profile in PMU-Based Distribution System State Estimation

Muscas

Pau

Sulis

2016

IEEE Trans. Instrum. Meas.

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“…Improvements through distributed approaches to state estimation have nevertheless been demonstrated in [20] and [21]. The linear relationship between the phasor measured and the elements of the state vector particularly boosts the performance of state estimators [22].…”

Section: Synchrophasors In Electrical Gridsmentioning

confidence: 99%

Archives of Electrical Engineering

Richter¹,

Hauer²,

Komarnicki³

2018

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Both the growing number of dispersed generation plants and storage systems and the new roles and functions on the demand side (e.g. demand side management) are making the operation (monitoring and control) of electrical grids more complex, especially in distribution. This paper demonstrates how to integrate phasor measurements so that state estimation in a distribution grid profits optimally from the high accuracy of PMUs. Different measurement configurations consisting of conventional and synchronous measurement units, each with different fault tolerances for the quality of the calculated system state achieved, are analyzed and compared. Weighted least squares (WLS) algorithms for conventional, linear and hybrid state estimation provide the mathematical method used in this paper. A case study of an 18-bus test grid with real measured PMU data from a 110 kV distribution grid demonstrates the improving of the system's state variable's quality by using synchrophasors. The increased requirements, which are the prerequisite for the use of PMUs in the distribution grid, are identified by extensively analyzing the inaccuracy of measurement and subsequently employed to weight the measured quantities.

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“…Compared to other applications (e.g. power-flow monitoring [15]), the SE is, in general, more demanding in term of steady-state accuracy. The specific SE analysis we performed enable us to infer the most stringent steady-state accuracy requirements for PMU operating in DSs.…”

Section: Pmu Accuracy Requirementsmentioning

confidence: 99%

Architecture and characterization of a calibrator for PMUs operating in power distribution systems

Colangelo

Zanni

Pignati

et al. 2015

2015 IEEE Eindhoven PowerTech

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Abstract-In recent years, the Phasor Measurement Unit (PMU) technology is rapidly evolving towards the potential deployment also in power distribution systems (DSs). In general, this specific field of applications requires PMUs whose accuracy levels are beyond those required by the IEEE Std. C37.118. Additionally, there is the need to define the architecture of an associated calibration system capable to assess the metrological performances of these devices. In this paper, we first analyse the impact of the uncertainties (in term of phase and magnitude) introduced by arbitrary PMUs on a state estimation (SE) process performed on the IEEE 13-bus distribution test feeder. The outcomes of this analysis are used to infer the most stringent steady-state performances of PMUs for DSs monitoring and, consequently, to define the requirements and the hardware architecture of a PMU calibrator presently developed at the Author's laboratories. A preliminary metrological characterization of the proposed calibrator is presented in the paper.

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Impact of synchrophasor measurement types and uncertainties on the accuracy of distribution system linear state estimators

Cited by 6 publications

References 19 publications

Uncertainty of Voltage Profile in PMU-Based Distribution System State Estimation

Uncertainty of Voltage Profile in PMU-Based Distribution System State Estimation

Archives of Electrical Engineering

Architecture and characterization of a calibrator for PMUs operating in power distribution systems

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