.5 Kva Single-phase High-frequency Soft-switching Aviation Static Converter Modules In Parallel System

Aviation static inverter (ASI) modules working in parallel are a new way to expand supply system capacity and it is one of the vital region power electronics. Each parallel module takes its share of the load, so the current stress for power switch reduced greatly. Higher reliability, lower cost and higher power density can be achieved by this way for large capacity power system and also system configuration becomes more flexible.The ASI parallel system in this thesis is presented based on common voltage loop control. The system is made up of five paralleled modules based on high-frequency zero-voltage-switch 1kVA ASI. Each module is controlled by voltage-current two closed-loops. The common voltage loop controls system output voltage & frequency, and generates a common reference current signal. Each module tracks the signal as current source module under current hysterisis control, therefore each paralleled module shares the load current. The system proves the high power density and the flexibility. The reliability, the expand ability and the maintenance of ASI system are effectively improved.