多机型超大型抽水蓄能电站电气主接线和厂房布置研究OA

Focusing on the connection of Fengning Pumped-storage Power Station to the world's first±500 kV flexible DC grid and the specific requirements of power system for various operation modes of the power station,considering the characteristics of its multiple units,the first construction of variable-speed units,as well as the various starting methods of fixed-speed units and variable-speed units,a comprehensive and in-depth study is conducted on key technologies such as the safety,reliability,flexibility and economy of the main electrical connection,the layout of main electrical equipments,and the construction period,and a set of design methods for the main electrical connection of an super-large pumped-storage power station that meets the combination of multiple units,multiple unit types,multiple starting methods,and multiple incoming and outgoing line circuits is proposed.At the same time,the layout method of"fixed/variable-speed units with the same span and same spacing,and multi-loop fire protection and maintenance channels for the main transformer tunnel"is proposed,effectively solving the technical problems of engineering layout in restricted spaces of large power plants under complex geological conditions.In addition,a double-layer layout structure of the main electrical circuit equipments for the AC-excited variable-speed pumped-storage units and a collaborative design method for the equipments such as generator voltage circuit,AC excitation circuit,and ventilation and air conditioning system are developed,ensuring the safe operation and convenient maintenance of the variable-speed unit AC excitation system.These achievements successfully support the engineering application of the first batch of AC excitation variable-speed units in China and realize the full commercial operation of large-scale pumped-storage power stations with multiple types of units.