Abstract
Primary frequency control(PFC) of thermal power unit is an important means to ensure power supply frequency and safe and stable operation of power grid. Through the analysis and research of the PFC standard of the power grid, combined with the control structure of conventional thermal power units, it is pointed out that the delay and inertia inherent in the unit equipment have a negative impact on the PFC performance. From two directions of field dynamic test and laboratory simulation, existing problems of currently widely used control structures are clearly defined, and the technical means of reducing the influence of delay on PFC are proposed. The practical application results show that the proposed method can effectively reduce the overshoot of the PFC system and ensure that the system recovers quickly and stably.
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