3kVA Three-phase Aviation Static Inverter With High Frequency Pulse DC Link

The circumstance, the development and the application perspective of the single-phase and three-phase Static Inverter on circuit construction and control technology are discussed in this paper. It is necessary for the Aviation Static Inverter with high frequency link to replace the Aviation Static Inverter with low frequency link. In the situation of using mass electric energy or three-phase four-wire system, the three-phase Static Inverter must be adopted.The three-phase Aviation Static Inverter with High Frequency Pulse DC Link is made of three independent Aviation Static Inverters and has the advantages such as strong function with unbalanced load and easy realization for module. A circuit topology of the inverter with duty cycle extended active clamp forward style high frequency pulse dc link is adopted by each independent inverter. Each inverter is cascaded by a circuit with duty cycle extended active clamp forward style high frequency pulse dc link and a DC/AC inverting bridge. The control strategy of voltage mode PWM forwardback is adopted by the former, and the control strategy of three-state discrete pulse modulation (DPM) hystersis current is adopted by the later.The operation principle of the Aviation Static Inverter with High Frequency Pulse DC Link is discussed, and the design criterions of the key circuit parameters are gained.A prototype for 3000VA 27VDC/115V400HzAC three-phase Aviation Static Inverter with High Frequency Pulse DC Link is designed and successfully developed. The test results demonstrate that this prototype has excellent comprehensive performances such as small bulk, lower weight, high efficiency, high steady precision, fast dynamic response, wide range input voltage, good output waveforms, strong over-load and short-circuit ability, and strong function with different nature load and three-phase unbalanced load.