The three-phase rectifier operation under the nonrigid network

Diesel generator, the power supply units, are placed in many marine objects. It represent the nonrigid power supply systems. Due to this reason they suffer with subharmonics oscillation caused by electronic loads. In cases when the three phase AC-DC converter is required the unity power factor rectification is needed. Modulation strategy for a matrix structured AC to DC converter is developed in this paper. This modulation strategy enables the input displacement factor correction without current sensing. Mathematical proof that AC to DC converter can operate with unity input displacement factor is provided by analysis based on the switching matrix approach. Theoretical analysis demonstrates the algorithm requirements. Computer simulation and experimental results supporting this ability are reported.