An optimization method for the closing law of guide vanes in pumped storage units when the pump is powered off

Abstract

The invention discloses an optimization method for a closure law of guide vanes under a water pump outage working condition of a pumped-storage group. The method is adopted to conduct effective optimization on the closure law of the guide vanes under the water pump outage working condition of the pumped-storage group. According to the method, the whole characteristic curve of a water pump turbine is utilized to build a transient process model of the water pump outage of the pumped-storage group; the composite indexes, including an ascending changing peak value of the rotation speed of the group and the maximum value of volute inlet pressure, serve as an optimized objective function, the optimization method for the closure law of the guide vanes under the water pump outage working condition of the pumped-storage group is designed to obtain a Pareto non-inferior solution set, and finally the solution with the best compatibility is selected from the Pareto non-inferior solution set as the optimal solution of the closure law of the guide vanes. The optimal solution of the closure law of the guide vanes, which is selected by means of the method, reduces the ascending changing peak value of the rotation speed of the group and the maximum value of the volute inlet pressure to a great extent, and the control level under an extreme water pump outage working condition of the pumped-storage group is effectively improved.

Description

technical field [0001] The invention belongs to the field of transition process analysis of water pump turbines in electric power systems, and more specifically relates to an optimization method for guide vane closing laws of pump power-off working conditions of pumped storage units. Background technique [0002] When the pumped storage unit pumps water normally, if there is a power failure, the guide vanes are required to cut off the water flow in the pipeline in time. Under such extreme working conditions, hydraulic transients will pose a great risk to the reliable operation of the pumped storage unit and the pressure diversion system, which is not conducive to the safe, efficient and stable operation of the unit. In order to achieve the purpose of safe and stable operation of the unit, it is urgent to improve the control level of the pumped storage unit for extreme working conditions. [0003] In engineering practice, choosing an appropriate closing rule can reduce the w...

AI Technical Summary

Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the purpose of the present invention is to provide a method for optimizing the closing law of the guide vane of the pumped storage unit when the pump is powered off, thereby solving the current closing law of the guide vane of the pumped storage unit The technical problem of the low control level of the pumped storage unit to the change of extreme working conditions in the optimization method

Images