PortugueseOPD: build, validation and release code for SimPT-Power, a public-data multi-voltage (0.4-400 kV) simulation database of mainland Portugal

Acquisition, network-building, power-flow, validation and release code for SimPT-Power: the 60-400 kV core CORE-3787-REN with 31,492 solved 15-minute AC power-flow snapshots, medium-voltage root slices, secondary substations, four-wire and geographic low-voltage networks, and the frozen and public release tooling, plus example notebooks.