The main configuration and performance of the towed AC/DC ground power vehicle engine:
1. Engine parameters
a. Dongfeng CUMMINS QSB5.9, straight-line diesel six-cylinder, water-cooled, turbocharged, intercooled, electronic fuel injection, maximum power: 154KW/2200RPM, rotational speed: 1846RPM, emission standard: EU STAGE 3A;
b. Protective devices: Equipped with emergency shutdown, overspeed shutdown, high-temperature protection shutdown, and low oil pressure protection shutdown devices.
2 The main performance of the towed AC/DC ground power vehicle generator
A. Three-phase AC medium-frequency synchronous brushless generator (a well-known domestic brand);
b. The rated speed of the generator is 1846 rpm, the rated power is ≥72kW, and the power factor is 0.8
3. Stability parameters of the output power supply of the towed AC/DC ground power vehicle
3.1 Voltage regulation capability:
a. Voltage recovery time: 100 milliseconds to recover to rated voltage, +/- 1%
b. Transient voltage regulation rate: +/- 13.8%, sudden increase from no-load to rated load
c. Voltage modulation: No more than +/- 1%, from no-load to rated load
d. Steady-state voltage modulation rate: 0.5%
e. Voltage imbalance: When the three-phase load is balanced, it shall not exceed 1%. When 30% of the rated load is applied to any one of the phases, it shall not exceed 4% when the other two phases are unloaded.
3.2 Voltage Waveform:
a. Peak coefficient: 1.414 +/- 0.07
b. Harmonic content: The total harmonic content shall not exceed 2%. Under a power factor of 0.8 and linear load conditions, the harmonic content of any phase shall not exceed 1.5%
c. It has an automatic cable voltage drop compensation function, with the compensation value greater than 5% of the rated voltage.
3.3 Requirements for Frequency Regulation Capability:
a. Frequency modulation: +/- 0.1%, from no-load to rated load to overload
b. Overfrequency protection: 420Hz, 5 seconds, automatically cut off the power supply and connection with the aircraft system, and the overvoltage indicator light will be on.
3.4 Settings of the Power Output Protection System:
The functions of the power output protection system:
The power output protection system has the functions of delaying, cutting off output and resetting manually in case of abnormal conditions such as overvoltage, undervoltage, over-frequency, under-frequency and overload in the power supply system.
b. The minimum time required for the protection device to cut off the output is less than 50ms.
