Architecture Decisions for Supporting Web-based Visualization of Distribution System Operating Envelopes

Operating envelopes are dynamic limits on power injections, computed in advance based on the operational con-ditions of the network, such as load profiles. These dynamic limits can unlock the full potential of distributed energy resources (DERs) by maximizing the use of existing infrastructure while ensuring a reliable power supply. Visualizing operating envelopes presents a significant challenge, it requires effectively conveying spatio-temporal information for multiple connection sites simultaneously. This paper discusses, demonstrates, and evaluates a set of software architecture decisions to support web-based visualization of distribution system operating envelopes. We propose a microservice-oriented architecture with two processing modules: one for time series power flow and another for three-phase unbalanced multi-period optimal power flow (also known as energy scheduling) computations. Both modules are con-tainerized, ensuring strong separation of duties and portability. Additionally, a web-based visualization interface is developed to incorporate advanced interactive visualization techniques to support the analysis of complex spatio-temporal relationships and “what if” scenarios. The performance of the approach is evaluated by measuring processing time and size from responses considering various distribution feeders, including the 3- Bus, IEEE 4-Bus, IEEE 13-Bus, and IEEE 123-Bus test feeders.