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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 . ISSN 1949-3053. (In Press)

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In the context of active distribution networks, AC Optimal Power Flow (OPF) has shown great potential to calcu-late setpoints for controllable devices. Although considerable literature exists, temporal aspects that may affect the actual exe-cution of these setpoints are rarely investigated. Due to the di-verse operating characteristics of controllable devices (i.e., de-lays, ramp rates and deadbands), when these setpoints are exe-cuted 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 adap-tations within the controllers of existing devices as well as in the OPF formulation to cater for the diversity in operating charac-teristics, ensuring that calculated setpoints are adequately im-plemented by controllable devices. This involves the direct con-trol of conventional devices and enforcing a new ramping behav-ior 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 (us-ing a UK test network with the objective of maximizing renewa-ble 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.
Subject Keywords:Active distribution network, distributed generation, optimal power flow (OPF), implementation
Record Number:CaltechAUTHORS:20210129-120019482
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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:01 Feb 2021 15:12

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