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Prototyping a smart micro-grid for a solar PV system

19 Apr 2013  | P. H. Cheah, B. Sivaneasan, K. V. Ravi Kishore, G. Anima, M. K. Foo, H. B. Gooi

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BESS hardware setup in LaCER

Figure 4: BESS hardware setup in LaCER at the NTU. A virtual instrument enables control of the BESS balancing.

To control the balancing of the BESS, a Labview virtual instrument (VI) was developed. The BESS hardware setup is shown in figure 4. In passive balancing, the parallel switch is ON until its voltage becomes equal to minimum voltage. In auto mode, passive balancing is active when the voltage difference between maximum and minimum is greater than the threshold pre-set through Labview GUI. In manual mode, passive balancing is active independent of voltage difference which is a case of 0V threshold in auto mode (see figures 5a and 5b).

Labview VI diagram

Figure 5a: The Labview virtual instrument diagram for the BESS balancing algorithm.

Labview GUI

Figure 5b: The voltage difference threshold between maximum and minimum voltage is set the through the Labview GUI above.

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