Pressurized water reactor nuclear power station steam generator water level control method and system

The invention is applicable to the professional technical field of mega-kilowatt-class pressurized water reactor nuclear power stations and provides a pressurized water reactor nuclear power station steam generator water level control method and system. The method includes a steam engine bypass drain valve openness signal, a water feeding deaerator steam inlet valve openness signal and a steam engine steam inlet narrow range signal; adopting a preset secondary loop image load algorithm to acquire secondary loop image load according to the steam engine bypass drain valve openness signal, the water feeding deaerator steam inlet valve openness signal and the steam engine steam inlet narrow range signal; acquiring a water level control signal; adopting the water level control signal to modify the acquired secondary loop image load and adopting the modified secondary loop image load to control a bypass water feeding adjusting valve of the steam generator. By means of the method and system, the steam generator wate