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On the Implementation of OPF-Based Setpoints for Active Distribution Networks

Liu, Michael Z. and Ochoa, Luis F. and Low, Steven H. (2021) On the Implementation of OPF-Based Setpoints for Active Distribution Networks. IEEE Transactions on Smart Grid, 12 (4). pp. 2929-2940. ISSN 1949-3053. doi:10.1109/tsg.2021.3054387.

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In the context of active distribution networks, AC Optimal Power Flow (OPF) has shown great potential to calculate setpoints for controllable devices. Although considerable literature exists, temporal aspects that may affect the actual execution of these setpoints are rarely investigated. Due to the diverse operating characteristics of controllable devices (i.e., delays, ramp rates and deadbands), when these setpoints are executed by multiple devices without adequate considerations, the resulting outcome can differ drastically from what is expected; leading to violations of network constraints and excessive control actions. Therefore, this work proposes a series of necessary adaptations within the controllers of existing devices as well as in the OPF formulation to cater for the diversity in operating characteristics, ensuring that calculated setpoints are adequately implemented by controllable devices. This involves the direct control of conventional devices and enforcing a new ramping behavior for inverter-interfaced devices. Furthermore, a linear, mixed-integer formulation is proposed to handle discrete devices and improve scalability in large networks. Co-simulation results (using a U.K. test network with the objective of maximizing renewable energy production and considering 1s time-step) demonstrate that, by catering for the operating characteristics of controllable devices, the expected outcome from OPF-based setpoints can be achieved.

Item Type:Article
Related URLs:
URLURL TypeDescription
Liu, Michael Z.0000-0002-9609-4544
Ochoa, Luis F.0000-0002-7853-4286
Low, Steven H.0000-0001-6476-3048
Additional Information:© 2021 IEEE. Manuscript received January 31, 2020; revised July 7, 2020, November 3, 2020, January 8, 2021; accepted January 14, 2021. Date of publication January 26, 2021; date of current version June 21, 2021. Paper no. TSG-00148-2020.
Subject Keywords:Active distribution network, distributed generation, optimal power flow (OPF), implementation
Issue or Number:4
Record Number:CaltechAUTHORS:20210129-120019482
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Official Citation:M. Z. Liu, L. F. Ochoa and S. H. Low, "On the Implementation of OPF-Based Setpoints for Active Distribution Networks," in IEEE Transactions on Smart Grid, vol. 12, no. 4, pp. 2929-2940, July 2021, doi: 10.1109/TSG.2021.3054387
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:107812
Deposited By: George Porter
Deposited On:01 Feb 2021 15:12
Last Modified:23 Jun 2021 22:46

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