Description
This dataset contains the electrical power measurements for the virtual meter and a reference meter. The virtual meter estimates household consumption by monitoring PEN voltage drop across the shared neutral. As loads on coupled circuits change, the current returning through the neutral will change accordingly, causing a measurable voltage drop relative to the reference PEN bonding point.
Use Case
Virtual Meter integrated in a host device on a dedicated (for example: an EV charger, a battery, a heatpump...) or shared (for example: plugin battery or heater) circuit.
Test Setup
- Grid Setup: Single-phase or Three-phase electrical system, TN earthing with neutral-earth bond at grid connection point
- Reference Meter: Shelly 3EM, using split core CTs, class B with ~1% accuracy
- Calibration: Calibration was performed manually, mapping the voltage drop to the reference power, to set the scaling factor for the virtual meter.
- Loads: Common household loads (mix of resistive, inductive and capacitive) activated for 10-20 sec (hotplate, oven, dryer, drill, microwave, etc...)
Limitations
- Accelerated Testing: The loads are activated and the measurements are recorded within an accelerated 20 min period. The ratio of base to peak loads in skewed in favour of peak loads.
- Manual Calibration: The accuracy is dependent on the manual mapping performed against the Shelly 3EM. Other methods are under development to perform calibration through automation.
Test Results
| Grid | Circuit | Calibration | Results | Test Sequence | MAE | Correlation | Graph |
|---|---|---|---|---|---|---|---|
| Three Phase | Dedicated | Manual | vm-3pd-site10-results.csv | vm-3pd-site10-testseq.csv | 59W | 0.92 |  |
| Three Phase | Shared | Manual | vm-3ps-site07-results.csv | vm-3ps-site07-testseq.csv | 262W | 0.90 |  |