When an AC synchronous generator is directly driven by an aircraft engine through a variable-speed transmission, the resulting AC power is variable-frequency AC. The variable-frequency power supply system does not require a constant-speed transmission device, thus offering a simple system structure, lightweight design, and high reliability. However, since the speed variation range of jet engines can reach 3:1, the generated AC power is only suitable for equipment that does not require a fixed frequency, such as heating and lighting systems. To meet the needs of equipment requiring constant-frequency AC power, an additional conversion device is necessary, which increases the weight of the equipment. Therefore, this type of variable-frequency AC power supply is more suitable for aircraft equipped with turboprop engines, as these engines have a smaller speed variation range, typically 1.15:1, resulting in a narrower frequency range for the AC power. Moreover, due to the limited number of high-quality power supply equipment on regional aircraft, the use of a standalone variable-speed variable-frequency AC power supply system on regional aircraft is highly attractive.
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