Designing scheme

　　　　This design uses 690V low voltage frequency conversion scheme, The high-power switch module uses German SEMIKRON IPM high-end intelligent module. Single module current up to 2400A, With the driving circuit, the protection current, using the optical fiber communication, high technology is mature, reliable performance. Adopt multilevel technology technology With independent intellectual property rights. inverting control and filter technique combined by exclusive control technology and filter technique, transformer and Sine wave filter are combined through a specially designed Hybrid Active Power Filter, to realize the multilevel output, to overcome the traditional ordinary two level technology waveform the disadvantage of poor quality. Due to the technology of our company to realize the multilevel output, harmonic content rarely, output increase a group of very small capacitance at the output can achieve the perfect wave,distortion is less than 0.5%(9 electrical level). This technology has been in the 9MVA, 6MVA, 5MVA, 3MVA etc multiple sets of variable frequency power supply system in application and achieved good results.
　　High-low-high (multilevel) scheme combined with the advantages of multilevel technology of high-voltage inverter and the maturity of low-voltage inverter . It has the advantages of mature, reliable, good waveform, and small size,is the optimal choice of The bridge variable-frequency power source.