Robust dynamic operating envelopes for flexibility operation using only local voltage measurement

Abstract: With growing intermittency and uncertainty in distribution networks around the world, ensuring operational integrity is becoming challenging. Recent use cases of dynamic operating envelopes (DOEs) indicate that they can be utilized for network awareness for autonomous operation of flexibility, maximizing distributed generation integration, coordinating flexibility in different power networks and in resource planning. To this end, a novel framework is presented for generating decentralized DOEs in real-time using only the nodal voltage measurement and partially decentralized, risk-averse, robust DOEs in a time-ahead setting using voltage forecast scenarios. Chance constraint level is analytically implemented for avoiding extremely restrictive time-ahead DOEs with insufficient feasible regions for local energy optimization. Since the proposed DOE calculation framework uses none or limited centralized feedback, it is resilient to cyberattacks, communication failures, missing data and errors in network layout information. Numerical results showcase the DOE calculation framework in real-time using voltage magnitude measurements and in day-ahead timeframe using forecasted voltage scenarios. Furthermore, the DOEs are extended to form P-Q charts while considering power factor and converter capacity limits.