This standard specifies the method for establishing mathematical models of synchronous generator excitation systems for power system stability analysis and calculation. This standard applies to the modeling of excitation systems for steam (gas) turbine generators, hydro generators, pumped storage power generation/motors, and nuclear power units. The following normative references are essential for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version (including all modification orders) applies to this document. GB/T 7409 (All Parts) Synchronous Motor Excitation Systems [IEC 34-16 (All Parts)] DL/T 583 Technical Conditions for Static Rectification Excitation Systems and Devices of Large and Medium Hydroelectric Generators DL/T 843 Technical Conditions for Excitation Systems of Large Hydroelectric Generators 3 Terms and Definitions The following terms and definitions apply to this standard. 3.1 The primary model is the model structure and parameters provided by the manufacturer or derived from the information provided by the manufacturer. 3.2 Measured model refers to the actual model structure and parameters obtained after measuring the model and parameters based on the original model. 3.3 Calculating Model The model structure and parameters used for stable calculations. a) Equivalent calculation model - a calculation model structure and parameters that are consistent with the measured model structure and confirmed to meet the requirements through simulation verification. b) Approximate Calculation Model - A model structure and parameters used for stable calculations that have a certain difference in structure from the measured model and are basically satisfied after simulation through calculation programs and parameter adjustments. 3.4 Step test The test of step changes in the given value of the controlled quantity
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