Power System

Analysis

Load a teaching example or published-case adaptation for steady-state study.

Study example

Examples include assumed study parameters. Sources and teaching assumptions.

Live solve — re-run load flow on every edit

In SLD view, double-click a line to outage/restore it and watch the flows redistribute.

Buses

Branches

From bus To bus

R (pu) X (pu) B (pu)

Length (km)

Rating (MVA) Tap

In service

Generators

Bus

P (MW) Vset (pu)

Qmin (MVar) Qmax (MVar)

Cost ($/MWh) Cost² ($/MWh²)

Pmin (MW) Pmax (MW)

Loads

CDF Import

Load an IEEE Common Data Format case — choose a file, or paste the text for a small hand-typed one. The import reports anything it had to drop or repair.

Choose a CDF file CDF text

PSS/E Import

Load a PSS/E .raw case (revisions 32 and 33). A real case is far too large to paste, so choose the file — the textarea is for small hand-typed cases. The import is lossy by construction and lists everything it dropped.

Choose a .raw file PSS/E RAW text

PowerFactory DGS Import

Load a PowerFactory .dgs interchange case (the ASCII export — a .pfd project archive cannot be read). The import is lossy by construction, lists everything it dropped, and says when the file does not designate a reference bus and what it chose instead.

Choose a .dgs file PowerFactory DGS text

Map

Map editor

The map is a geographic editor of the power system. Click a bus or line to select it, arm Drag bus to move the selected bus, Add bus then click the map to drop a new one, or Add branch then drag from one bus to another to connect them. The real OpenStreetMap power grid shows underneath, and solved flows animate along the lines.

Offline note

The power system is stored with localStorage in the browser and persists offline after the page has loaded. OpenStreetMap tiles still depend on network access or browser cache.

Live results

Healthy — V 0.95–1.05 pu · line <60%

Marginal — V outside band · line 60–90%

Heavy — line 90–100%

Violation — V <0.90/>1.10 · overload

SlackPVPQ (dot at the bar's left end)

Hover a line for its flow and impedance; click it to read the detail in the panel opposite. Double-click: outage / restore. Without a mouse: pick the branch in the editor's Branches list and toggle In service.