my country has successfully developed and manufactured the world's largest hydropower unit with a single unit capacity of 1 million kilowatts.
This 1 million kilowatt hydropower unit has the manufacturing capacity of a full range of wind turbines with a maximum unit capacity of 10 MW. The maximum height of the rotor of the 1 million kilowatt unit is more than 4 meters, and the weight of the rotor is as high as 2295 tons. The weight is 2240 tons. Due to its large size, the rotor requires two 1,300-ton bridge cranes to lift it.
The 1 million kilowatt hydropower unit was the first to be successfully put into operation on the right bank of Baihetan Hydropower Station, and all operating indicators of the unit reached high-quality standards. The single-machine capacity of the million-kilowatt hydroelectric generator set ranks first in the world. The "zero counterweight" giant long and short blade runner developed by the company has an optimal runner efficiency of up to 96.7%, leading the world. The rated voltage is 24 kV, currently the highest voltage in the hydropower industry. grade.
Working Principle
The energy conversion process of the hydroelectric generating unit is divided into two stages: first, the water turbine converts the lost potential energy of the water into mechanical energy, and then the generator converts the mechanical energy of the water turbine. Converted into electrical energy.
The specific process is that under the impact of the water flow, the hydraulic turbine begins to rotate, converting the potential energy of the water into mechanical energy; the hydraulic turbine in turn drives the coaxially connected generator to rotate, and under the action of the excitation current, The rotating rotor drives the excitation magnetic field to rotate, and the stator winding of the generator cuts the excitation magnetic field lines to generate an induced electromotive force. While outputting electric energy, an electromagnetic braking torque is generated on the rotor in the opposite direction of its rotation.
Since the water flow acts on the turbine continuously, the rotational torque obtained by the water turbine from the water flow is used to overcome the electromagnetic braking torque generated on the motor rotor. When the two torques reach balance, the hydroelectric generator set It will run at a certain constant speed, stably generate electricity, and realize energy conversion. Therefore, the turbine and the generator are the two most critical components of the hydroelectric power generation unit.