CONTROLLING A FOUR-WIRE THREE-LEVEL AC/DC CONVERTER WITH INDEPENDENT POWER CONTROL IN EVERY PHASE
The article presents the design of a four-wire, three-level AC/DC converter. The converter was controlled with the use of a proportional-resonant controllers based voltage oriented control (VOC). The implemented topology of the AC/DC converter allows to control each of the phases separately. This translates into the possibility of independent control of active and reactive power in each of the phases. In addition, the DC bus of the AC/DC converter is connected in parallel with the energy storage via an isolated DC/DC converter and with a renewable energy sources. The tests were carried out with the use of the designed converter, DSP controller and Matlab/SIMULNIK platform, which was used for automatic code generation. The results obtained show that independent control of each of the phases is possible, however, the operation with large power unbalances on each of the phases leads to large current pulsation on the DC bus. This is a phenomenon that threatens the correct operation of the energy storage. As a result, the level
of asymmetry between phases should be limited to the level acceptable by the energy storage.
three-level four-wire converter; control of a 4-wire converter; independent power control in each phase; energy storage
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