Robust Operating Envelopes with Phase Unbalance Constraints in Unbalanced Three-Phase Networks

Operating envelopes are emerging as a useful tool to maximise DER market participation while ensuring security of distribution networks. Existing methods to calculate operating envelopes often assume balanced networks, or model unbalanced networks and neglect certain risks specific to the unbalanced...

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Bibliographic Details
Main Authors: Russell, James Stanley, Scott, Paul, Iria, Jose
Format: Conference Proceeding
Language:English
Subjects:
Asia
DER
Distribution networks
operating envelopes
Reactive power
robust optimisation
Robustness
Security
Smart grids
unbalanced three-phase networks
Voltage
Voltage unbalance factor
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Summary:Operating envelopes are emerging as a useful tool to maximise DER market participation while ensuring security of distribution networks. Existing methods to calculate operating envelopes often assume balanced networks, or model unbalanced networks and neglect certain risks specific to the unbalanced three-phase case. In this paper we propose a method to ensure robustness of operating envelopes with respect to voltage unbalance constraints, in addition to voltage magnitude constraints, derived using a linear model of unbalanced three-phase distribution networks. We achieve this by directly modelling the feasible operating region for DER with respect to voltage unbalance and magnitude constraints, then formulating a robust optimisation problem to calculate envelopes. Simulations using a non-convex power flow model demonstrate DER envelope robustness with respect to voltage unbalance and magnitude constraints, and we provide brief comments about sources of conservatism in results.
ISSN:2378-8542
DOI:10.1109/ISGTAsia54891.2023.10372617