Abstract:In Guangxi flood season，the contradiction between hydropower consumption and peak-valley regulation is prominent，in order to avoid abandoning water，it is necessary to fully exploit the potential of deep peak regulation of coal-fired thermal power units. Aiming at this problem, this paper firstly studies the multi-stage peak regulation process and principle of coal-fired thermal power unit, and then comprehensively analyzes the peak regulation cost of coal-fired thermal power unit from the aspects of coal consumption cost, fuel consumption cost, loss cost, environmental cost, etc., and gives the mathematical model of the peak regulation cost of coal-fired thermal power unit and analyzes the calculation example. On this basis, a scheduling model of multi-stage peak regulation for coal-fired thermal power units is proposed, and the economic benefits of thermal power units participating in peak regulation auxiliary services and different compensation levels are simulated and analyzed. The standard 10-machine system is adopted for the calculation example, and the scheduling model is solved by commercial software GAMS. The effectiveness of the proposed peak regulation cost model and multi-stage peak regulation model is verified by simulation.