Control Strategy Optimization for Thermal Power Unit-Flywheel Energy Storage Coupling System

To construct a thermal power unit-flywheel energy storage coupling system with high-quality frequency regulation performance, the primary frequency regulation command was first decomposed into differential and filtered components by the tracking differentiator, which were used as the load commands for the flywheel and thermal power unit, respectively. Then, a primary frequency regulation control strategy for the thermal power unit-flywheel energy storage coupling system was designed to achieve the adaptive adjustment of flywheel output under the coordination of state of charge (SOC) and grid frequency deviation. Results show that the designed coupled frequency regulation system can give full play to the complementary advantages of thermal power and flywheel characteristics, effectively improve the assessment indicators of primary frequency regulation performance, and enhance the stability of the unit as well as the safety of the power grid.