WLS distribution system state estimator based on voltages or branch-currents: Accuracy and performance comparison

Pau, Massimiliano; Pegoraro, P. A.; Sulis, Sara

doi:10.1109/i2mtc.2013.6555467

Cited by 39 publications

(21 citation statements)

References 18 publications

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“…It is easy to understand how a simple variable elimination can be performed from (14), writing one current as a function of the other incident ones. In fact, for each zero injection, a current can be expressed as a function of the other state variables and eliminated from the state.…”

Section: Proposed Method: State Vector Reductionmentioning

confidence: 99%

“…In particular, two main classes of DSSE exist, based on two different choices of the underlying state vector: node voltage state estimators, NV-DSSEs (as in [7,13]) and branch current estimators, BC-DSSEs (as [8][9][10][11][12]). BC-DSSE is suitably designed to better keep into account the peculiar characteristics of distribution systems, as the radial or weakly meshed topology and the high r/x ratios, and it is usually faster with respect to those based on voltage state (see [14]). …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An efficient method to include equality constraints in branch current distribution system state estimation

Muscas

Pau

Sulis

2015

EURASIP J. Adv. Signal Process.

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Distribution system state estimation is a fundamental tool for the management and control functions envisaged for future distribution grids. The design of accurate and efficient algorithms is essential to provide estimates compliant with the needed accuracy requirements and to allow the real-time operation of the different applications. To achieve such requirements, peculiarities of the distribution systems have to be duly taken into account. Branch current-based estimators are an efficient solution for performing state estimation in radial or weakly meshed networks. In this paper, a simple technique, which exploits the particular formulation of the branch current estimators, is proposed to deal with zero injection and mesh constraints. Tests performed on an unbalanced IEEE 123-bus network show the capability of the proposed method to further improve efficiency performance of branch current estimators.

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Section: Proposed Method: State Vector Reductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An efficient method to include equality constraints in branch current distribution system state estimation

Muscas

Pau

Sulis

2015

EURASIP J. Adv. Signal Process.

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“…After comparing two main types of WLS state estimators for distribution systems which based on node voltage state and branchcurrent state respectively, Ref. [8] concluded that branchcurrent estimators with the slack bus voltage as one of the state variables can give estimation accuracies comparable to the voltage ones.…”

Section: Introductionmentioning

confidence: 99%

“…Several methods have been presented since state estimation was introduced in power systems [1][2][3][4][5]. Among them, the predominant approach is the weighted least squares (WLS) method [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Selecting Weights for Different Type Measurements in WLS State Estimation

Yao¹,

Wu²,

Wang³

2014

Proceedings of the 2014 International Conference on Mechatronics, Electronic, Industrial and Control Engineering

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Abstract-Power system state estimation provides accurate and complete data for several online advanced application software in energy management systems. Its main consideration is how to acquire accurate data. State estimation are usually solved by weighted least squares estimation, and selecting a reasonable weight for every measurement is the most important means to achieve a good estimation. Traditionally variance of measurement is selected as its weight. But measurements of different type have different effect on the accuracy of state estimation even if they have same error. Selection of weights must take the measurement type into account, so a method of selecting weights for measurements of different type is presented. Firstly accuracy index of state estimation is defined as the sum of the squares of errors of every measurement; then accuracy index of state estimation for every measurement is calculated by perturbation method; finally mean accuracy index of state estimation of measurements of each type is calculated and used to design a coordination factor to adjust weights for measurements of different type. IEEE30 network is analyzed by the proposed method, and the results prove the effectiveness of the proposed method.

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“…20 The details of forward-sweep algorithm can be found in [44,54]. 21 The BC-DSSE is presented by Mesut Baran in his paper [32] 25 26 In [58] and [59] the two SE formulations, i.e. NV-DSSE and BC-DSSE, are compared.…”

mentioning

confidence: 99%