EN 61400-27-1:2015

European foreword
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms, definitions, abbreviations and subscripts
4 Symbols and units
5 Specification of models
6 Specification of validation procedure
Annex A (informative) - Validation test documentation
Annex B (normative) - Limits to possible model accuracy
Annex C (normative) - Digital 2nd order critically damped
        low pass filter
Annex D (informative) - Simplified plant level model
Annex E (informative) - Two-dimensional aerodynamic
        model
Annex F (informative) - Generic Software Interface for use
        of models in different software environments
Annex G (normative) - Block symbol library
Bibliography
Annex ZA (normative) - Normative references to
         international publications with their
         corresponding European publications

IEC 61400-27-1:2015 specifies dynamic simulation models for generic wind turbine topologies/concepts/configurations on the market. It defines the generic terms and parameters with the purpose of specifying the electrical characteristics of a wind turbine at the connection terminals. The models are described in a modular way which can be applied for future wind turbine concepts. The dynamic simulation models refer to the wind turbine terminals. The validation procedure specified in IEC 61400-27-1 focuses on the IEC 61400-21 tests for response to voltage dips, reference point changes and grid protection.