Evaluation of price-sensitive loads’ impacts on transmission network congestion using an analytical approach

Seyyed Mohsen Sadr; Habib Rajabi Mashhadi

Evaluation of price-sensitive loads’ impacts on transmission network congestion using an analytical approach

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Author(s): Seyyed Mohsen Sadr ¹ and Habib Rajabi Mashhadi ¹
- Affiliations: 1: Electrical Engineering Department, Faculty of Engineering, Ferdowsi University of Mashhad, Azadi Square, Mashhad 91775-1111, Iran
Source: Volume 9, Issue 6, 20 April 2015, p. 523 – 530
DOI: 10.1049/iet-gtd.2014.0552 , Print ISSN 1751-8687, Online ISSN 1751-8695

Received 31/05/2014, Accepted 18/08/2014, Revised 06/08/2014, Published 23/03/2015

An analytical approach is presented to evaluate the impacts of price-sensitive loads on congestion in transmission network. To achieve this aim, the Lagrange multipliers (LMs) of transmission lines’ power flow constraints are calculated from independent system operator's social welfare maximisation in which demand-side bidding is considered. It is shown that the LM of each congested line can be decomposed into five components. The first part is a constant value for the specified line, while the next two components are associated to generating units and the last two constitutive parts are related to load service entities (LSEs). The proposed decomposition obtains considerable information regarding the impacts of price-sensitive loads on congestion in transmission network. First, the sensitivity of congestion degree of each congested line to the bidding strategies and maximum price-sensitive demand of LSEs are indicated by weighting coefficients of the last two terms in the decomposed LM. Furthermore, the decomposition of LM to the constitutive components reveals the contribution of each generating unit and LSE to the congestion of corresponding line. The simulation results on a test system confirm the efficiency of the proposed approach.

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Evaluation of price-sensitive loads’ impacts on transmission network congestion using an analytical approach

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