Classification method of primary frequency modulation operating area of mixed-flow hydropower units:Taking Laxiwa hydropower station as an example
The primary frequency regulation performance of variable head wide load of mixed-flow hydropower unit is an important core to construct flexible power balance system and ensure frequency stability.Under the premise of stability test of hydropower station,this paper proposes a method of operation classification based on the electrical characteristics of primary frequency modulation.The method takes the adjustment time,stability time and integral power as the classification criteria,and uses the regional area,regional center and regional comprehensive per-formance to evaluate the system.Taking the Laxiwa hydropower station of the northwest frequency modulation power plant as an example,the mathematical model is verified by comparing with the experimental data.On the basis of confirming the accuracy of the calculation,taking the frequency modulation performance as the optimization goal,the influence law of water mechanical and electrical parameters such as pipe diameter,moment of inertia and inte-gral gain on the operation classification is explored.Finally,the contribution of hydro-mechanical parameters to frequency modulation performance and operation area is summarized,and the optimization direction of primary fre-quency modulation operation of mixed-flow hydropower units with variable head and wide load is pointed out.
mixed-flow hydropower unitsprimary frequency modulationoperation areavariable headwide load
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