access icon free Uncertainty level of voltage in distribution network: an interval model and application in centralised storage location

© The Institution of Engineering and Technology
Received 19/03/2017, Accepted 07/06/2017, Revised 08/05/2017, Published 08/06/2017

Intermittent distributed generations, stochastic loads and other uncertainties have uncertain impacts on the node voltages in distribution network. To quantitatively assess the impact boundaries of uncertainties on node voltages, an interval model is proposed in this study from the perspective of linear description. The model parameters defined as the voltage influence intervals are solved for as follows: first, conduct the analysis sample collection through the affine power flow and the expected operating point estimated by point-estimate method; then, calculate the voltage influence intervals via interval regression for the above sample. To meet the different demand of solving efficiency and conservative level for parameter identification, two solution methods of interval regression based on quadratic programming and stochastic programming are proposed, respectively. To further illustrate the practical application of the interval model, an optimal location method for centralized energy storage is presented. The verification results based on the modified IEEE 33-bus system and practical 113-bus system demonstrate the interval model and its solution methods have an excellent performance in assessing the impact boundaries of uncertainties. The application case also shows that the proposed decision method can produce a global and robust location scheme with considering the bound uncertainty of distributed generation output fluctuations.

Inspec keywords: energy storage; regression analysis; stochastic programming; load flow; quadratic programming; distribution networks; decision theory; distributed power generation

Other keywords: interval model; linear description; quadratic programming; interval regression; IEEE 33-bus system; centralised energy storage; parameter identification; Intermittent distributed generations; optimal location method; robust location scheme; IEEE 113-bus system; stochastic programming; centralised storage location; distribution network; stochastic loads; global location scheme; point-estimate method; distributed generation output fluctuation bound uncertainty; voltage influence intervals; affine power flow; decision method; node voltages; voltage Uncertainty level

Subjects: Other energy storage; Distributed power generation; Optimisation techniques; Distribution networks; Game theory

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