Modification Method for Guide Vane Opening and Speed Optimizer of Variable-Speed Pumped Storage Under Pump Condition

Variable speed pumping and storage(VSPS) can control active power indirectly by controlling rotor speed through converter under pumping condition. In the current modeling of VSPS under pumping condition, most of the optimized formulas of guide vane opening and speed adopt linear approximation, which leads to the fact that the actual absorbed active power cannot fully respond to the command value. Therefore, this paper presents a modified method of guide vane opening and speed optimization. Firstly, the simplified electromechanical transient model of VSPS under pumping condition is established. Then, the operating range and characteristics of the pump are obtained by simulation experiment. The linear expressions of guide vane opening, rotational speed and active power are obtained by linear fitting. The active power in the fitting process was modified from the actual value to the command value to obtain the cubic polynomial. The simulation results show that the modified active power can track the instruction value well, and the difference between the active power and the command value is an order of magnitude smaller than that before the modification.