Abstract
Increasing levels of distributed generation (DG), as well as changes in electricity consumption behavior, are reshaping power distribution systems. These changes might place particular stress on the secondary low-voltage (LV) distribution systems not originally designed for bi-directional power flows. Voltage violations, reverse power flow, and congestion are the main arising concerns for distribution system operators (DSOs), while observability in these grids is typically nonexistent or very low. The present paper addresses this issue by developing a method for nodal voltage estimation in unbalanced radial LV grids (at 0.4 kV). The workflow of the proposed method combines a data-driven grey-box modeling approach with generalized additive models (GAMs). Furthermore, the proposed method relies on experimental data from a real-world LV grid in Denmark and uses data input from only one measuring device per feeder. Predictions are evaluated by using a test data set of 31 days, which is more than twice the size of the training data set of 13 days. The prediction results show high accuracy at root mean squared errors (RMSEs) of 0.002–0.0004 p.u. The method also requires a short computation time (14 s for the first stage and 2 s for the second stage) that meets requirements for the practical, real-time monitoring of DSO grids.
| Original language | English |
|---|---|
| Article number | 4366 |
| Journal | Energies |
| Volume | 16 |
| Issue number | 11 |
| Number of pages | 22 |
| ISSN | 1996-1073 |
| DOIs | |
| Publication status | Published - 2023 |
Bibliographical note
Funding Information:This work was supported by the Flexible Energy Denmark (FED) project funded by Innovation Fund Denmark under Grant No. 8090-00069B, and the ebalanceplus project funded by the European Union’s Horizon 2020 under the grant agreement number of 864283.
Keywords
- Data-driven modeling
- Distribution power systems
- Generalized additive models
- Grey-box modeling
- Phase voltage estimation
