DSQC609 3HAC14178-1 PBSE5117 | ABB | Adopting current control mode

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DSQC609 3HAC14178-1 PBSE5117 | ABB | Adopting current control mode

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The control idea is: after sampling and feedback of the output inductor current io, DSQC609 3HAC14178-1 PBSE5117 is compared with the synchronously processed sine wave reference current iref, which is in the same frequency and phase as the grid voltage. The error signal is adjusted by PI and then generated by the SPWM generator to generate the corresponding driving signal, which is sent to the main circuit to drive the switching transistor.

At the moment of grid connection start-up of the inverter, if the effective tracking of the current loop is not quickly established, it will cause a large phase difference in current tracking, which may exceed 90 °, and the system will backflow current and absorb power from the grid. If the current tracking difference cannot be controlled in a short period of time, it will cause the system overvoltage protection to act. Therefore, the control of grid connected current in the system should not only pay attention to its steady-state performance indicators, but also pay attention to its dynamic indicators.

As shown in Figure 3b, the grid voltage is equivalent to an external disturbance, and the impact of this disturbance on the control process cannot be ignored in DSQC609 3HAC14178-1 PBSE5117. Therefore, it is necessary to add a feedforward control variable to the forward channel before the disturbance point for suppression, in order to effectively improve the dynamic performance of the system.

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