The frequency of alternating current refers to the number of times the voltage or current of alternating current changes per unit time.The frequency unit is Hertz (Hz); the commonly used frequencies for energy storage power supplies are 50Hz and 60Hz.The level of AC frequency has a great impact on the power system and electrical equipment.

1. The difference between AC frequency 50Hz and 60Hz

50Hz and 60Hz are the standard frequencies used in household electrical systems in Europe and the United States, respectively.Their main differences are：

The cycle of 50Hz is longer than that of 60Hz, and the speed of voltage and current change is slower.

The power formula of alternating current is P=UI cosΦ, where U is the voltage, I is the current, and cosΦ is the power factor.When U and I are constant, reducing Φ can increase the power factor, thereby improving the efficiency of electrical energy utilization.Under the same voltage and current, the Φ value of 50Hz is larger, so the power factor is lower and the energy utilization efficiency is lower.

The light output at 50Hz is about 16.7% lower than at 60Hz, which can cause visual flicker and dizziness.

2. The influence of AC frequency on energy storage power supply

In a power system, the speed of the alternator is proportional to the output voltage.Voltage fluctuations caused by load changes, if the frequency is unstable, will cause electrical equipment failure or damage.However, power equipment operating in Europe and other places must adapt to 50Hz power supply, and power equipment operating in the United States and other places must adapt to 60Hz power supply, which limits the interconnection of the international power system.

3. The influence of AC frequency of energy storage power supply on electrical equipment

The frequency of alternating current in the energy storage power supply has an impact on the working stability, safety and energy saving of electrical equipment.Some electrical equipment is designed for specific frequencies, such as 60Hz motors and 50Hz transformers.If the electrical equipment is connected to the wrong frequency of energy storage power supply, it will make the equipment vulnerable to damage and even cause safety issues such as fire.When using electrical equipment, pay attention to its rated frequency and ensure that the connected energy storage power supply matches it.