Study on Optimum Start-Up Method for Hydroelectric Generating Unit Based on Analysis of the Energy Relation

As to ensuring the start-up of hydroelectric generating units is rapid, steady and safe, the selection of start-up mode and the setting of the start-up strategy are of crucial importance. To confirm the optimum start-up mode and to obtain the best dynamic quality in start-up process, the open-loop mode, closed-loop mode and "open-loop + closed-loop" mode are compared and analyzed by using a nonlinear mathematical model, and the engineering example is a hydropower station with a surge chamber and a long draw water tunnel. Moreover, the traditional "open-loop + closed-loop" control mode is improved, and the frequency conversion point between the open-loop stage and closed-loop stage is delayed to 95%, and this improved "open-loop + closed-loop" mode has great improvement in every respect. Aiming at the setting of the start-up strategy, this paper explores the optimum setting of guide vane opening from the angle of energy relation, presenting the "singlet type" method of guide vane opening setting, and various engineering examples is analyzed.