1. Draw the network
Lay out the POI, voltage levels, transformers, lines, collector buses, loads, generation, BESS and shunts.
Power-system modelling software
A browser-based PSS/E alternative for interconnection model development.
HV Power Flow gives project developers and engineers an accessible workspace for building, solving and checking an interconnection case before the utility performs licensed validation in PSS/E.
- Best suited to
- Project-side interconnection development
- Exchange formats
- RAW, DYR, SEQ and SLD Builder
- PSS/E targets
- Revisions 34 and 35
- Access
- Web browser, $500 USD/month
Where it fits
Develop the submission model without starting in licensed desktop software.
PSS®E is an established utility and transmission-planning platform. HV Power Flow addresses an earlier part of the job: creating the project network, entering equipment and manufacturer data, testing the proposed architecture, and preparing exchange files that can move into a PSS/E review environment.
This can reduce the cost and friction of early interconnection iterations while preserving a familiar utility handoff.
HV Power Flow is designed for
- Data-center and large-load interconnection models
- Renewable, BESS and conventional generation projects
- Single-line development and equipment-data organization
- AC power flow, fault, contingency, PV/QV and RMS study development
- PSS/E-compatible case preparation and readiness checks
HV Power Flow does not replace utility-approved study models, manufacturer validation, professional engineering review or the utility's licensed PSS/E verification.
Workflow comparison
Different tools for different stages of the interconnection process.
The practical question is not whether every PSS/E capability is duplicated. It is whether the project team can develop a coherent case that enters the utility workflow without rebuilding the architecture.
| Workflow need | HV Power Flow | Licensed PSS/E environment |
|---|---|---|
| Access | Runs in a modern browser with subscription access. | Desktop or enterprise installation with a Siemens licence. |
| Model drafting | Visual buses, branches, transformers, machines, BESS, loads and shunts. | Full transmission-planning database and diagram environment. |
| Project studies | Power flow, short circuit, N-1, PV/QV and RMS dynamic development studies. | Broad production study suite, automation APIs and approved model libraries. |
| Dynamic data | Organizes supported model parameters and exports DYR records. | Executes the utility's approved dynamic libraries and user-defined models. |
| Exchange | Exports PSS/E-compatible RAW, DYR and sequence-data records with readiness checks. | Reads, validates, solves and saves the utility's official case. |
| Final authority | Project development and submission preparation. | Licensed utility validation and formal study execution. |
From model to handoff
A submission-oriented workflow.
2. Enter engineering data
Capture ratings, impedances, controls, sequence values, dynamic parameters and manufacturer references.
3. Solve and stress
Review steady-state balance, equipment duty, contingencies, voltage margin and time-domain events.
4. Run readiness checks
Identify missing PSS/E fields, inconsistent terminals, unsupported dynamic records and incomplete sequence data.
5. Export the package
Create the RAW, DYR, SEQ companion, collector report and PSS/E validation runner from one case.
6. Validate in PSS/E
The professional and utility load the exchange package, apply official study assumptions and confirm the results.
Common questions
Is it a full replacement for PSS/E?
No. HV Power Flow is an alternative workspace for developing interconnection models and producing PSS/E-compatible exchange files. It is not a substitute for the utility's official base case, approved dynamic-model libraries or final licensed validation.
Can a utility open the exports?
The export workflow targets PSS/E RAW revisions 34 and 35 and produces companion dynamic and sequence records. Each project still requires read-back testing in the target PSS/E version and confirmation against current utility requirements.
Why use both tools?
Project teams can iterate quickly in HV Power Flow, then give the utility structured files for verification in the environment it already uses.
Build the model before licensed validation.
Start with the electrical architecture, solve the case and prepare the PSS/E exchange package in one browser workspace.