Generators can be used in all walks of life, and hydropower stations are one example. Why can the frequency of hydropower station generators remain stable? Shaanxi generator manufacturer-Wanpeng Power Xiaobian will tell you about it. The stability of AC frequency is ultimately determined by its supporting substation. Substations require relatively stable output power of the generator set to work normally. The rotation of the water turbine controls the amount of water flowing into the water turbine through an auxiliary machine called a "governor", so that it maintains a constant speed and balances it with the external load, thereby stabilizing the speed of the generator rotor.

First, when the output power of the alternator is less than the load power, the output frequency of the alternator will decrease, and otherwise the output frequency of the alternator will increase. For balance and stability of the grid frequency, all generators use double closed-loop control of the speed of the prime mover (that is, the thing that turns with the generator). Thermal power stations are controlled by controlling the amount of coal input, and hydropower stations are controlled by controlling the amount of water input. In turn, it is essentially achieved (ignoring various losses) that the work done by water falling on the water turbine is always equal to the active power required by the load downstream of the generator.