Coordination between an Aggregator and Distribution Operator to Achieve Network-Aware Load Control

Operational issues could arise on a distribution network if a third-party aggregator controls a large number of the network's loads without visibility of network states or topology. This paper investigates mechanisms by which an aggregator could coordinate with a distribution network operator such that aggregate load actions do not negatively impact the network. We propose two possible frameworks for coordination and develop a specific coordination scheme in which the operator can partially block the aggregator's control inputs to loads. We design a control strategy for the aggregator assuming it has little to no information about how the operator is blocking its control. The proposed controller estimates the number of loads that are not receiving the aggregator's commands and compensates accordingly. In a simulation study, the proposed controller consistently outperforms a benchmark controller in terms of average tracking error.