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US 10,554,049 B2Granted
Real-time disaggregation of renewable energy generation on an electricity distribution system
AssigneeThe Regents of the University of California
InventorsEmma Mary Stewart, Ciaran Martin Roberts, Emre can Kara, Michaelangelo David Tabone
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Abstract
Techniques are described for disaggregation of renewable energy generation on an electricity distribution system. Aggregate power measurements are identified a distribution substation. Active power load of the distribution substation and active power generated by renewable energy sites can be disaggregated from the aggregate power measurements.
Claims20
A method comprising:
- calculating, using a device, aggregate active power associated with a distribution substation based on a sample of voltage phasor measurements and current phasor measurements;
- calculating, using the device, aggregate reactive power associated with the distribution substation based on the sample of voltage phasor measurements and current phasor measurements;
- generating an estimated power factor representing an average value of an effective relationship between the aggregate active power and the aggregate reactive power;
- determining an active power load value at the distribution substation based on the estimated power factor, the aggregate reactive power, and an average reactive power load of the distribution substation, the average reactive power load being independent of the aggregate reactive power;
- determining an active power photovoltaic (PV) value from one or more PV sites connected with the distribution substation based on a difference between the aggregate active power and the active power load value;
- identifying a PV irradiance proxy measurement corresponding with active power being generated by a proxy PV site proximate with the distribution substation;
- identifying an effective PV capacity of the proxy PV site;
- identifying a load variance associated with the active power load value measured during a period of non-insolation;
- identifying an aggregate variance associated with the distribution substation during a period of insolation;
- determining, based on a difference between the aggregate variance and the load variance, a PV variance associated with the active power PV value;
- generating a disaggregated active power PV value for the one or more PV sites by modifying the active power PV value according to the PV irradiance proxy measurement, the effective PV capacity of the proxy PV site, and the PV variance, the disaggregated active power PV value representing an estimated value with a root-mean-square error (RMSE) accuracy of less than 10%;
- detecting a switching event;
- and
- compensating for the detected switching event in load power factor measurements.
11 more elements
A method comprising:
- identifying, using a device, aggregate active power associated with a distribution substation;
- identifying, using the device, aggregate reactive power associated with the distribution substation;
- generating an estimated power factor representing an average value of an effective relationship between the aggregate active power associated with the distribution substation and the aggregate reactive power associated with the distribution substation;
- determining active power load at the distribution substation based on the estimated power factor and the aggregate reactive power associated with the distribution substation;
- and
- determining active power generated by one or more renewable energy sites connected with the distribution substation based on a difference between the aggregate active power and the active power load;
- detecting a switching event;
- and
- compensating for the detected switching event in load power factor measurements.
6 more elements
A system comprising:
- one or more processors and memory configured to:
- identify, using a device, aggregate active power associated with a distribution substation;
- identify, using the device, aggregate reactive power associated with the distribution substation;
- generate an estimated power factor representing an average value of an effective relationship between the aggregate active power associated with the distribution substation and the aggregate reactive power associated with the distribution substation;
- determine active power load at the distribution substation based on the estimated power factor and the aggregate reactive power associated with the distribution substation;
- and
- determine active power generated by one or more renewable energy sites connected with the distribution substation based on a difference between the aggregate active power and the active power load;
- detecting a switching event;
- and
- compensating for the detected switching event in load power factor measurements.
7 more elements
Dependencies are inferred from the claim text.