Effect of Heat Storage Device on Primary Frequency Regulation Capacity of Thermal Power Unit

High penetration of renewable energy has brought great challenges to the stability of power systems. Meanwhile, in the era of knowledge economy, higher requirements are put forward for power supply quality such that the issues of power system frequency regulation will gradually become prominent. Since the thermal power unit is the main power source for the peak-load regulation of power system, the thermal storage device equipped with the unit has been studied both theoretically and practically regarding its influence on the peak-load regulation capability of power system. This paper takes a 300 MW unit as the example to analyze the effect of different thermal storage device configurations on the unit's primary frequency regulation capacity. The results show that different configurations have different effects on the primary frequency regulation capacity of thermal power units at different time intervals. This study has positive reference significance for the analysis of the influence of thermal power flexibility transformation and the assessment of generation deficit of primary frequency regulation of power system.