We know that the most commonly used frequency for aircraft power generation systems is 400Hz, which is a relatively constant frequency system,Aircraft variable frequency power generation systemIt is also a relatively new topic for system units in recent years. So in this article, the editor will explore the power generation system andAircraft power management and distribution system. These are all components and subsystems closely related to the operation and flight of all aircraft. In this type of drive, the output speed of the variable speed constant frequency power generation system is variable, so the frequency of the output generator is variable. In order to provide a constant frequency AC voltage of 400Hz, a DClink is formed between the generator side and the AC load, as shown in Figure 2-b, using AC/DC and DC/AC power converters, or using an AC/AC converter as shown in Figure 2-c. The DC link provides additional benefits for high-voltage loads and power supply to charge the battery.

In this technology, the speed of the engine is variable, so the frequency of the generator is also variable. Its output voltage is 200V and the frequency range is 360-800Hz. Variable frequency drive system is the simplest form of power generation, the cheapest and most reliable. The impact of variable frequency voltage on other aircraft subsystems, such as engines and controllers on the aircraft.

The auxiliary power unit (APU) is a generator driven by the main engine, which generates electricity from alternating current during normal combat conditions for the entire aircraft. During ground maintenance and engine maintenance, power is provided by the APU during start-up. Most aircraft can use APU as a backup power source during normal flight to prevent generator failure. The auxiliary power unit is a constant speed generator with a three-phase output of 400Hz and 200V.

In the event of a generator or APU failure, a scramjet air turbine (RAT) or fuel cell is used as an emergency power source. RAT is a constant speed generator with three-phase power of 400Hz and 200VAC. Fuel cells serve as emergency power sources for DC output. Fuel cells require a power converter to solve interface issues. Batteries are also used to provide emergency power when backup power is lost or unavailable. Due to slow chemical reactions, fuel cells typically work together with batteries. Therefore, batteries are responsible for providing power during transient periods, while fuel cells are used in steady-state operation.

Ground power supply device

When an aircraft operates on the ground for a long time, it needs to be provided with power for maintenance and testing. Ground power can be generated by an electric generator set. The usual standard for ground power supply is three-phase 200VAC 400 Hz, which is different from

The frequency of the aircraft's AC power generation system needs to be consistent so that all power and electronic systems can operate normally when the aircraft is on standby without damaging internal components and systems.