Calculation method for analytic solution of small fluctuation transition process of one-hole multi-machine surge-chamber-containing hydropower station

The invention discloses a method for calculating a small fluctuation transition process analytic solution of a one-hole multi-machine hydropower station with a surge chamber, which comprises the following steps of: establishing a dynamic characteristic mathematical model of a water delivery system during load disturbance according to a rigid water attack theory of non-constant flow of a pipeline; a diversion tunnel momentum equation, a tailrace tunnel momentum equation, a pressure pipeline momentum equation, a surge chamber flow continuity equation, a unit characteristic equation, a generator acceleration equation and a speed regulator equation are combined to obtain a system differential equation set; the high-order system can be converted into a combination of a zero-order link, a first-order link and a second-order link through Laplacian transformation solution, and the time domain process of the state variable can be obtained by respectively carrying out Laplacian inverse transformation. According to the