Performance Evaluation and Parameter Identification for Primary Frequency Response Control of Wind Turbine.

It is clearly pointed out in the two rules ¹ that grid-connected new energy units have primary frequency modulation capability, and especially wind turbine has a huge potential for primary frequency response. Therefore, it is necessary to manage and evaluate its primary frequency response control performance in detail. However, the traditional evaluation methods are based on the static power-frequency curve of the unit, which is so simplified that the control modes are accurately described. And even the primary frequency response process of wind power units with more complex control modes and response characteristics are not clear. Therefore, two dynamic evaluation indexes of the power perspective and the energy perspective are proposed in this paper, which are based on the transfer function of the wind turbine primary frequency response under various control modes. And then the identification methods are given, which evaluate the actual and theoretical parameter values of the proposed indexes. The simulation experiment and example analysis show that compared with the traditional static view evaluation method, the evaluation parameter identification can more accurately reflect the actual primary frequency response control performance, and the evaluation index calculation results can more accurately reflect the qualification degree of the primary frequency response control performance of the unit. ¹ Two rules are published by the Nation EnergyAdministration of China, which include: Rule 1:Implementation rules for grid-connected operation management of power plants;Rule 2:Implementation rules for grid-connected auxiliary service management of power plants.