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Grid Study for Wind, PV & Hybrid Power Plants

Our Services


WIND FARM / SOLAR FARM Basic Design – Detailed Design

Unit Model Benchmarking and Validation

We offer validation of generating unit models in compliance with FGW Technical Guideline TG 8 or IEC 61400-27-2 required for unit certificate:

Capability Verification:

  • Fault ride-through (FRT) support
  • Fast fault current injection capabilities (e.g., ≥2% rated current per 1% voltage drop)
  • Active power regulation with ramp rate and droop control
  • Reactive power operation: Q(U), Q(P), cos(φ)(P) compliance
  • Multiple fault ride-through capability, etc.

Model Validation Study:

  • Comparison of simulation RMS model results with test bench or field measurement data or validated detailed EMT model
  • Structural model review, tuning, and alignment
  • Generation of complete documentation and benchmarking reports

Power Plant-Level Static Compliance Studies

We deliver power plant-level simulation services to support connection at offshore or onshore TSO according to the relevant standards and project-specific requirements:

Load Flow and Reactive Power Studies:

  • Short circuit ratio calculation
  • Reactive power exchange compliance and Q(U) range mapping
  • Tap-changer coordination and voltage control support
  • Reactive compensation and passive filter design

Short-Circuit Studies (per IEC 60909):

  • Symmetrical and asymmetrical short-circuit calculations
  • Evaluation of component withstand and circuit breaker dimensioning
  • Compliance with IEC 61000-4-7 and resonance avoidance

RMS-Based Grid Code Compliance Studies

We perform full RMS dynamic simulations to support German TSO connection requirements, model reviews, and grid code compliance packages:

Dynamic Grid Studies Include:

  • Fault Ride-Through Analysis for normal and n-1 scenarios:
    • Low/under voltage ride-through and over/high voltage ride-through (3-phase, 2-phase, 1-phase)
    • Compliance with TSO fast fault current injection profiles and timelines
    • Synchronization and resynchronization
  • Frequency Stability Studies:
    • Frequency containment and restoration behavior
    • Active power control (droop, ramp rate, frequency deadband)
  • Reactive Power Support:
    • Q(U), Q(P), cos(φ)(P) tests under steady-state and transient conditions
  • Weak Grid Operation:
    • Short-Circuit Ratio (SCR) < 3 performance analysis

Our services and reports are built to comply with all key German and European standards:

  • FGW TG 8, TG3, TG4
  • VDE-AR-N 4110 (MV), 4120 (HV), 4130 (EHV)
  • IEC 60909, IEC 61000-4-7
  • TSO-specific requirements from:
    • TenneT TSO GmbH
    • 50Hertz Transmission GmbH

Engineering Tools & Modeling Capabilities

  • DIgSILENT PowerFactory

Deliverables(German and English)

We provide all necessary documentation for TSO review and certification:

  • RMS simulation models
  • Unit validation reports (FGW TG 8)
  • Static & dynamic compliance study reports aligned with TSO-specific guidelines
  • Support in OEM or TSO review meetings, and feedback loops