Power System Studies

Renewable Integration Impact Study

Integrate solar, wind, or BESS without destabilising the brownfield network.

Adding a 10 MW solar plant to a 50 MW brownfield network changes everything. Fault levels, protection coordination, power quality, voltage profile, anti-islanding. We model the full impact in ETAP and DigSILENT, engineer the interconnection, and certify grid-code compliance · all signed by a Chartered Engineer.

Why this matters

Why renewable integration breaks brownfield protection without redesign

A brownfield electrical network was designed for unidirectional power flow from utility to load. The protection scheme reflects that · directional relays facing one way, anti-islanding relying on under-frequency, sensitivity tuned for utility-source fault levels. Inject 10 MW of solar at the LV bus and the assumptions break. Power flows reverse in the morning, fault levels jump on the inverter contribution, anti-islanding fails on balanced load match, and the utility refuses commissioning until a formal integration study certifies grid-code compliance. The study models the integrated network across all operating cases, redesigns the protection scheme, sizes anti-islanding interlocks, and certifies CEA / IEEE 1547 / IEC 61400 compliance.

Method

How we deliver Renewable Integration Impact

CEng MIE India-signed deliverables · LiDAR-powered where applicable · digital twin handover ready · routes to the Power System Studies practice lead within 24 hours.

Renewable resource + topology

PV plant sized against tilt, ambient, soiling, degradation per IEC 61724. Wind turbine power curve characterised. BESS C-rate, round-trip efficiency, end-of-life capacity modelled.

Grid code compliance modelling

Fault ride-through (FRT) curves checked against CEA / IEEE 1547 / CGN code. Reactive capability envelope verified. Frequency regulation, voltage regulation, harmonic injection limits checked.

Protection re-coordination

Directional relays re-tuned for bidirectional flow. Anti-islanding scheme engineered (active + passive, ROCOF + vector shift). Inverter contribution included in short-circuit study.

Power quality impact

Inverter harmonic injection modelled. Voltage profile across all operating cases. PV cloud-transient simulation, wind ramp event simulation. STATCOM or filter sized if injection exceeds IEEE 519.

Sign-off + grid code certification

Report signed by a Chartered Engineer. Grid code compliance attestation per CEA / IEEE 1547 / national code. Annexed to utility commissioning application.

Standards + compliance

Built to the standards your auditors quote

Reports reference the international and national standards your regulators, F500 audit teams, and corporate process safety leads cite. Every deliverable signed by a Chartered Engineer (CEng MIE India).

IEEE 1547 · Interconnection and Interoperability of Distributed Energy Resources
IEC 61400 (all parts) · Wind energy generation systems
IEC 61724 · Photovoltaic system performance monitoring
CEA Regulations (India) · Grid Connectivity of Distributed Generation
NFPA 70 Article 690 · Solar Photovoltaic (PV) Systems (USA)

Anonymous case anchors

What this looks like in production

Three landmark engagements from our verified roster · quantified outcomes, no client names disclosed without written permission.

Refinery, India · 8 MW captive solar

Integration study with 33 kV PCC injection. Re-coordinated 12 directional relays. Anti-islanding engineered with utility-side intertie. Certified grid code · commissioning approved on first submission.

Steel plant, USA · 12 MW solar + 4 MWh BESS

Cloud transient simulation showed 2.4 MW/sec ramp · sized BESS for ride-through. STATCOM tuning preserved voltage during morning ramp. EAF coordination unaffected.

Pharma, KSA · 5 MW rooftop solar

PV harmonic injection at 0.4 kV bus modelled. Sized 7% detuned filter to keep PCC THD below 4%. Voltage rise during midday injection limited via reactive setpoint.

Frequently asked

Renewable Integration Impact · the practical questions

Do I need a grid impact study to connect solar to my plant?

In most jurisdictions yes, and the connecting utility will normally require it before granting interconnection. The study establishes fault contribution from inverter-based sources, voltage regulation, the impact on existing protection coordination, and harmonic emission at the connection point.

What is a fault ride-through study and when is it required?

Fault ride-through verifies that the plant stays connected through a grid voltage dip for the duration the applicable grid code mandates. It is normally required for inverter-based generation at the interconnection stage, and it is verified by simulation because the behaviour is governed by inverter control response rather than machine physics. PSCAD and DigSILENT are the usual tools.

Which grid codes do you work to for renewable interconnection?

CEA regulations in India, IEEE 1547 where it has been adopted, and the applicable national or system-operator code in the market of operation. Because the compliance envelope is set by the connecting utility, the governing code and revision are confirmed with them in writing before modelling starts.

How does battery storage change my existing protection settings?

A battery system is a bidirectional source, so fault current can flow toward the plant as well as from it. Directional elements, reverse-power protection and anti-islanding all need review, and coordination that assumed a single upstream source is usually no longer valid once storage is added.

Will rooftop solar affect my power factor and harmonics?

It can affect both. Inverters operating at or near unity power factor displace reactive support that your existing correction may have been tuned around, and they add harmonic emission on the LV side. Both effects are measured and modelled as part of the integration study rather than assumed either way.

Scope your Renewable Integration Impact engagement.

Tell us your plant, region, and scope · a named Chartered Engineer responds within 24 hours.

4 fields. No phone interview to start.
Per-discipline routing to the Power System Studies practice lead.
Anonymous case anchors sent with first reply.
Same-day callback for deadline-driven enquiries.

Power System Study Scoping

ETAP/DigSILENT/PSCAD-led · routes to Practice Lead PSS · 24-hour response.