SOLAR-ASSISTED COAL-FIRED POWER GENERATION SYSTEM PARTICIPATING IN PRIMARY FREQUENCY MODULATION, AND CONTROL METHOD THEREFOR

摘要

Disclosed are a solar-assisted coal-fired power generation system participating in primary frequency modulation, and a control method therefor. By means of coupling a medium-low-temperature heat collector and a coal-fired unit, a system configuration with two adjustment schemes, i.e. a high-water-feed bypass and a low-grade condensate bypass, and participating in primary frequency modulation is proposed; primary frequency modulation control logic is formulated, such that the system efficiently and accurately participates in primary frequency modulation control, and the frequency of a power grid is kept rapid and stable; and control logic for a thermal system working medium outlet temperature is formulated, and by means of adjusting the heat exchange working medium flow of the heat collector, it is ensured that the temperature in each section is stable during a primary frequency modulation process. According to the method in the present invention, by means of parameter and operation matching of a turbine system and a solar heat collector, the accuracy and effectiveness of a primary frequency modulation process are improved; by means of the rational utilization of different heat collectors and different temperature intervals, irreversibility is reduced, and the economic efficiency of various thermal system adjustment schemes is further improved; and finally, the operation flexibility of a transient process of a supplementary electricity generation unit can be greatly improved.