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This paper proposes a new method to monitor and mitigate fault induceddelayed voltage recovery (FIDVR) phenomenon in distribution systems using{\mu}PMU measurements in conjunction with a Reduced Distribution System Model(RDSM). The recovery time estimated from a dynamic analysis of the FIDVR isused to monitor its behavior and a linear optimization is formulated to controlair conditioner loads and DER reactive power injection to mitigate the FIDVRseverity. The RDSM is made up of several sub-models, each of which is analogousto the Composite Load Model (CLM) with selected parameters. The linearformulation in combination with the RDSM reduces the computation time, enablingonline execution. Simulated {\mu}PMU measurements from the IEEE 37 nodedistribution system connected to the IEEE 9 bus system under various faultscenarios are used to evaluate the proposed methodology. The resultingmitigation schemes are validated using combined transmission-distributionsystem simulations, thereby demonstrating that {\mu}PMU measurements along withthe RDSM enable FIDVR mitigation by optimal control of reactive power injectionfrom DERs with minimal load disconnection

Monitoring & Mitigation of Delayed Voltage Recovery using {\mu}PMU Measurements with Reduced Distribution System Model