Draw the actual network
Arrange buses, lines, transformers, loads, generators, BESS and capacitor banks on a voltage-coloured single-line diagram.
Power-system studies without the desktop bottleneck
HV Power Flow
PSS/E-ready interconnection models, built in the browser.
Lay out the single-line, enter equipment data, solve the network and package the case as PSS/E-compatible files for utility review.
RAW
Network case
DYR
Dynamic models
SEQ
Sequence data
SLD Builder
Diagram workflow
Target PSS/E revision 34 or 35 from the same case.
A practical PSS/E alternative
Build the submission model before opening licensed software.
HV Power Flow brings network drafting, equipment data, studies and exchange checks into one accessible workspace. Your utility can receive familiar PSS/E formats and validate the case in its existing environment.
Open Power Flow StudioModel engineering data
Capture equipment ratings, impedances, controls, sequence data and dynamic characteristics in organized inspectors.
Study before submission
Run load flow, fault, contingency, voltage-stability and RMS dynamic studies while the architecture is still easy to change.
Exchange with the utility
Export the network and model records in PSS/E-compatible formats, with readiness checks that catch missing or inconsistent data.
Data-center interconnections
Model the campus, not only the meter.
Represent the utility POI, redundant transformers, medium-voltage distribution, IT and UPS loads, cooling systems, standby generation, BESS and reactive-power controls in one electrical case.
See the dynamic responseLarge-load architecture
Build redundant transformer paths, collector buses, campus loads and on-site resources around the actual point of interconnection.
Component load behaviour
Represent power-electronic IT and UPS load, VFD cooling fans, pumps, chillers and conventional load components for dynamic studies.
Ride-through and controls
Apply faults and switching events, then inspect voltage, frequency, MW and MVAr response across the campus.
Utility handoff
Keep steady-state, sequence and dynamic records aligned for export into the utility's PSS/E review environment.
Large-jurisdiction workflows
Built for the data discipline expected in regions such as ERCOT.
ERCOT maintains a dedicated Large Load Interconnection process and publishes modelling resources for data centers and other large electronic loads. HV Power Flow helps project teams organize the network, sequence and dynamic data used in PSS/E-based review, then identify gaps before licensed validation.
HV Power Flow is not affiliated with or approved by ERCOT. Current ERCOT, TSP, DSP and utility requirements remain controlling and project-specific.
One case, end to end
A clearer path from concept to utility review.
Keep the electrical architecture, calculations, study results and exported records tied to the same model.
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1
Build
Draft the single-line and enter project equipment.
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2
Solve
Run the AC power flow and review limits and losses.
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3
Stress
Test faults, contingencies, voltage response and events.
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4
Check
Resolve PSS/E readiness findings and missing data.
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5
Export
Deliver the case package for licensed verification.
Engineering workspace
Core studies in the same model.
Run the studies commonly needed to shape an interconnection before the formal utility process locks in the architecture.
AC Power Flow
Bus voltages, branch flows, transformer losses, loading and swing-bus balance.
Short Circuit
Three-phase and unbalanced fault duties with sequence-network data.
Contingency
Equipment outages, common-mode groups and ranked violations.
Voltage Stability
PV and QV sweeps for the base case and selected contingencies.
Dynamic Study
Partitioned implicit DAE studies for time-domain faults and switching events with selectable measurement channels.
Readiness Checks
Structured checks for PSS/E fields, dynamic records and submission gaps.
Time-domain response
See the event, channels and recovery.
This data-center case applies a fault at 34.5KV BUS 1 and records voltage, active power, reactive power and frequency on a shared time axis.
4 output channels
0.15 s bus fault
All steps solved
The deliverable matters
Native PSS/E exchange files for the utility's workflow.
The export package is designed to move the model into PSS/E instead of trapping it in a separate web format. Choose the target revision, run the readiness checks and hand off files the reviewer already understands.
Explicit PSS/E 34 and 35 targets
Deterministic field and record ordering
Validation runner and readiness report
Solved-case values included where PSS/E stores them
project_case.raw
Network and solved-case data
Exports buses, loads, machines, shunts, branches and transformers in the selected PSS/E RAW revision.
- Use
- Open or read the steady-state network in PSS/E
- Targets
- PSS/E revisions 34 and 35
- Checks
- Sections, field counts, IDs and transformer groups
Designed for interconnections
Give the reviewer a model, not a screenshot.
PDF diagrams and spreadsheets explain a project. An importable electrical model lets the utility test it. HV Power Flow is built around that handoff from the first bus you place.
Questions
What to know before you submit.
Is HV Power Flow a replacement for PSS/E?
It is an accessible alternative for developing power-flow and interconnection models and preparing PSS/E-compatible files. Utilities can import and independently verify the exported case in their licensed PSS/E environment.
Which PSS/E files can it export?
The app exports RAW network files, DYR dynamic-model records, a SEQ sequence-data companion, an SLD Builder workflow and a validation package. Availability depends on the data entered in the case.
Does the utility still need to verify the model?
Yes. A qualified professional must verify the engineering, manufacturer data, assumptions, study settings and local utility requirements. The app is a modelling and exchange tool, not professional approval.
Can I bring an existing case into the app?
Existing PSS/E RAW files can be imported for continued modelling. The project workspace also preserves the app diagram layout and case data for later work.
Can it support a data-center interconnection in ERCOT?
It can be used to develop the project-side network, study the proposed architecture and prepare PSS/E exchange files and readiness data. Current ERCOT and interconnecting-provider requirements, official study models, licensed validation and professional review still apply.
Ask a question
Talk through your model or submission workflow.
Send a question about data-center modelling, PSS/E exports, interconnection studies or subscription access. A real person will review it and reply by email.
Data-center and large-load cases
PSS/E exchange packages
Utility submission preparation
Build the case once
Start your next interconnection model.
Move from a single-line concept to a utility-reviewable PSS/E package in one browser workspace.