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When providing bulk power system services, a third-party aggregator couldinadvertently cause operational issues at the distribution level. We propose acoordination architecture in which an aggregator and distribution operatorcoordinate to avoid distribution network constraint violations, whilepreserving private information. The aggregator controls thermostatic loads toprovide frequency regulation, while the distribution operator overrides theaggregator's control actions when necessary to ensure safe network operation.Using this architecture, we propose two control strategies, which differ interms of measurement and communication requirements, as well as modelcomplexity and scalability. The first uses an aggregate model and blockingcontroller, while the second uses individual load models and a mode-countcontroller. Both outperform a benchmark strategy in terms of tracking accuracy.Furthermore, the second strategy performs better than the first, with only0.10% average RMS error (compared to 0.70%). The second is also able tomaintain safe operation of the distribution network while overriding less than1% of the aggregator's control actions (compared to approximately 15% by thefirst strategy). However, the second strategy has significantly moremeasurement, communication, and computational requirements, and therefore wouldbe more complex and expensive to implement than the first strategy.

Strategies for Network-Safe Load Control with a Third-Party Aggregator and a Distribution Operator