New rules and grid codes to connect generators to the grid are emerging worldwide. In every country or region, the operators responsible for the safety and reliability of the power system have established different requirements to connect renewable generation systems to transmission and distribution networks. Such requirements are highly dependent upon the characteristics of individual power systems.

DIgSILENT has developed a new verification tool called DIgSILENT GridCode. The software has been designed in response to the need to verify whether a conventional or renewable power plant is compliant with local Grid Code interconnection requirements on basis of generating unit tests. There is a new trend towards verification of requirements at the point of interconnection of a power plant using transient stability simulations with numerical models. An increasing number of Transmission System Operators are including model validation methods to quantify the risk and uncertainty when using these simulation models in stability studies. These new methods have been included in the DIgSILENT GridCode tool.

The application can be automated and integrated into existing SCADA systems, but can also run on a workstation as an off-line verification tool. DIgSILENT GridCode has a new graphical user interface for easy navigation and generates customisable and automated reports in MS Word© format.

Among many others, DIgSILENT GridCode compliance verification functions are:

  • Low Voltage Ride Through (LVRT): Verification of generator response during balanced and unbalanced voltage dips, verification of voltage support requirements during the dip and after dip clearance, supervision of power plant non-disconnection and/or supervision of active power recovery according to the user selected grid code.

  • High Voltage Ride Through (HVRT): Verification of generator response during balanced and unbalanced voltage swells, verification of voltage support requirements during the swell and after swell clearance, supervision of power plant non-disconnection and/or supervision of active and reactive power recovery according to the user selected grid code.

  • Model validation: LVRT or HVRT simulation results are compared against field measurements according to the user selected method to check that both data series fit well. 

  • Power Quality requirements: Flicker and harmonic levels can be assessed according to classical International Standards (IEC-61000-4-15, IEC-61000-4-7) or according to specific methods for renewables (IEC-61400-21, TR3).

DIgSILENT GridCode key features

  • Data Viewer
  • Phasors Viewer
  • Check Grid Code Compliance
  • Model Validation
  • Flickermeter IEC 61000-4-15
  • Harmonics IEC 61000-4-7
  • Toolbox IEC 61400-21:
    • Single file Flickermeter
    • C(psi, va) – Flicker coefficients
    • Switching operations
    • Harmonics / Interharmonics /High Frequency Components
    • Harmonic distortion at PCC
  • Additional tools for grid code modifications and data series management:
    • Grid Code Editor
    • File Cutter
    • File Converter / Resampler
    • File Merger






New in DIgSILENT GridCode 2.0

Support of new Grid Codes:

  • ENTSO-e Network Code for Requirements for Grid Connection Applicable to ALL GENERATORS (26th June 2012).
  • China GB/T 19963 – 200, State Grid Corporation and China Electric Power Research Institute.
  • Germany: EEG: Renewable Energy Sources Act, measurement procedure by FGW - TR3 for medium and high voltage networks.
  • South Africa: “Grid Code compliance test for wind energy facility connected to transmission or distribution grids in South Africa” by Eskom.
  • Spain: Update to the new version 10 of the PVVC to check compliance with P.O.12.3 and P.O.12.2 (draft).
  • United States: Federal Energy Regulatory Commission: FERC661

New model validation methods:

  • IEC-61400-27-1 (CD1 2011.12.23): "Wind turbines – Part 27-1: Electrical simulation models – Wind turbines"
  • GERMAN FGW - TR4 (Rev. 5 – 2010.03.22): "Technical Guidelines for Power Generating Units - Part 4"
  • CHINA CEPRI (June 2012), according to the internal method "Wind Power Grid Interconnection Research and Evaluation Center"

New in the IEC61400-21 Toolbox for Power Quality analysis:

  • Harmonic total and individual distortion calculation at the PCC

Other features:

  • New graphical user interface, easy navigation with new menus and icons
  • Event classification: voltage dips, voltage swells, balanced or unbalanced events.
  • Shortcuts for fast access to configuration parameters.

DIgSILENT GridCode v2.0 Demo Version

The Demo Version of DIgSILENT GridCode v2.0 is a limited commercial version available for evaluation during a period of 30 days.

The Demo Version will be installed in your computer with the following capabilities:

  • Complete visualisation of main menu and execution of independent Grid Code modules (LVRT analysis, harmonic analysis, flicker...)
  • Execution and computation available for predefined input files.
  • Possibility of modifying the calculation parameters (rms rate, thresholds, etc.)
  • Grid Code editor is fully available; the voltage dip shape can be modified, active power and reactive power requirements in zones, etc. The resulting grid code conditions can be checked with the demo files.
  • Editing options as copy/paste graphs, export option to csv format, and other powerful edition capabilities.


GridCode Brochure
GridCode Presentation


South Africa Grid Code Test Example
Spanish Grid Code Test Example
Modell Validation Test (Spanish Code)
German FGW TR4 Model Validation
Australian Grid Code Model Validation
Australian Grid Code Prony Analysis