Consultancy · study

HVDC & IBR grid integration studies

Integrating HVDC links and large inverter-based resources (IBR) onto an increasingly converter-heavy network raises questions that span performance, stability and compliance. An integration study brings these together for a specific connection and its surroundings.

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When it's needed

When this study is needed.

  • An HVDC scheme or large IBR plant is connecting to a region with limited synchronous support.
  • The connection must demonstrate both compliance and good behaviour alongside neighbouring converters.
  • System strength is low and control margins need to be understood before commitment.
  • Multiple schemes are progressing in the same area and their combination is untested.
Method

How we approach it.

  1. Define the connection, the surrounding network and the schemes that share the region.
  2. Establish the grid-code requirements and the integration questions to answer.
  3. Build validated EMT models of the HVDC/IBR plant and the network equivalent.
  4. Assess performance, ride-through, current injection and control interaction across conditions.
  5. Identify risks and mitigations, and document the evidence for review.
Software

Tools we use.

  • PSCAD / EMTDC for detailed converter and HVDC modelling
  • Impedance / frequency-domain analysis for interaction screening
  • PowerFactory / PSS®E for wider-network context
Scenarios

Scenarios & operating points.

  • Low- and high-system-strength conditions
  • Single scheme and combined multi-scheme operation
  • Credible outages that weaken the connection
  • Dispatch and control-mode variations
Deliverables

What you receive.

  • Integration study report covering performance, stability and compliance
  • EMT evidence and interaction screening results
  • Risk and mitigation summary with verification
  • Validated models and documented assumptions
Quality & validation

Evidence that stands up to review.

Because integration spans several concerns, the study states clearly which questions each method answers and identifies the governing conditions, so the operator can review performance, stability and compliance evidence coherently.

Selected work

Comparable experience.

Case-study write-ups for this service are in preparation. To discuss directly relevant project experience, brief us — we can talk it through, under NDA where appropriate.

FAQ

Questions engineers ask.

Why does low system strength matter so much?
With fewer synchronous machines, the network is “weaker” — the same converter current causes larger voltage and angle excursions, which tightens stability and ride-through margins and makes interactions more likely.
Is HVDC modelling different from IBR modelling?
The principles are shared (detailed EMT, vendor control models, validation) but HVDC schemes have their own control structures and study questions; we model each to the level the question requires.
Can you assess several projects together?
Yes — that is often the point. Assessing the combination can reveal interactions that individual project studies miss, provided the relevant models are available.
Next step

Brief us on a study.

Send a one-paragraph scope — the system, the codes that apply, and the question you need answered. We typically reply within two working days.

Brief us on a project→

Related: Consultancy hub · Control interaction studies · SSO / impedance studies · Generator EMT modelling

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consulting@velonenergy.com