| The station-based external power supply system for airplanes (beeline power supply system) iswidely used in airport and large-scale ships for its large capacity and convenience for using. Due tothe long distance of transmission and high voltage frequency, the cable voltage drop is significant andthen the voltage quality may easily fails to comply with the requirements of the aircraft. And, thesystem will supply power for multi airplanes at the same time. So the mutual effect and failureisolation must be considered.Based on analyzing the subsistent solutions, a cable voltage drop compensation scheme for400Hz power supply system is presented, which adopts a dynamic voltage compensator (DVC) tocompensate the voltage drop. Combined with the characteristics of the power system, threeindependent dual buck inverters (DBI) are selected as the inverter power stage, an uncontrolledrectifier is used to obtain energy from the grid side. In-phase compensation strategy is adopted for itshigh-economy and ease of implementation. Load voltage RMS feedback control is employed which isa non-corresponding control. In order to meet the requirement of high switching frequency and wideduty ratio in400Hz inverter which outputs voltage waveform of high quality, a MOSFET drivecircuit is studied. Based on theoretical analysis, a prototype of mid-frequency power supply terminalis developed. The original rational experimental research is done, which prove the feasibility andvalidity of400Hz DVC.In this paper，a one-to-three beeline power supply system is established using simulationsoftware Saber and researched through simulation. The simulation shows that in the system capacityrange, each branch can work normally and has no mutual interference. The compensation effect isgreat. When part of a branch is shorted, the others are affected seriously. So further research must bedone to avoid power supply points’ mutual interference and to realize rapid fault isolation. |
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