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Performance optimization of primary frequency regulation based on modeling of turbine and its governing system

Performance of thermal power unit's primary frequency regulation is both important to the stability of power system and self's economy. In order to optimize it, a model of steam turbine and its governing system was established based on system identification, and a key element of valve discharge characteristics was introduced into the model. Through the improved model, performance factors of primary frequency regulation were analyzed quantitatively. According to analysis result, the valve discharge characteristic function was corrected, main steam pressure compensation had been brought into effect, control parameters of primary frequency regulation were re-tuned considering robustness. Finally, actual primary frequency regulation test indicated that the performance of primary frequency regulation was satisfactory under multi-load conditions.