DSQC658 3HAC025779-001 | ABB | Independent/grid connected mode switching

Description

DSQC658 3HAC025779-001 | ABB | Independent/grid connected mode switching

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From the above analysis, it can be seen that the independent and grid connected working modes have their own control methods, DSQC658 3HAC025779-001, and different control methods need to be implemented through different circuits. So, the switching of the working mode of the inverter system is manifested in hardware as the switching of the control circuit. The UTC4053 chip is used here to meet this requirement.

Based on the characteristics of UTC4053, design the mode selection circuit as shown in Figure 5.
MOD-SEL is the mode selection signal controlled by the microcontroller, REF-SIN is the reference sine signal, DSQC658 3HAC025779-001 is given by the microcontroller, EA-OUT is the error signal, Io-SENSE is the output current feedback signal, and Uo-SENSE is the output voltage feedback signal. R7-R10, C4, C5, and operational amplifier U1 form the feedback control circuit for grid connected operation of the inverter system. R11-R15, C7, C8, and operational amplifier U2 form the feedback control circuit for independent operation of the inverter system.

The working principle of this part of the circuit DSQC658 3HAC025779-001 is as follows: ① When MOD-SEL=1, VQ1 conducts, A=B=0, C=0, then channels ax and bx open. REF-SIN is inputted from terminal a and outputted from terminal ax, and compared with the voltage feedback signal VC-SENSE. The signal adjusted by the operational amplifier circuit shown in the figure is inputted from the bx end and outputted from the b end, and this signal is EA-OUT. At this time, it is in independent operation mode; ② When MOD_SEL=0, VQ1 is turned off, A=B=1, C=0, then channels ay and by are opened. REF-SIN is inputted from the a terminal and outputted from the ay terminal, and compared with the current feedback signal IL-SENSE. The signal adjusted by the operational amplifier circuit shown in the figure is inputted from the by end and outputted from the b end, and this signal is EA-OUT. At this time, it is in grid connected operation mode.

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