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1 From the data show in Figure 7, the SOC values according to the equations 4 2 (negative electrolyte) and 5 (positive electrolyte) were calculated [60]. 3 SOC CV2 (4) CV2 CV3 2 4 SOC CVO (5) CVO CVO2 2 5 As it can be seen, the SOC values depend on the concentration of the ions involved 6 in the reaction of each compartment. The obtained values are shown in Table 3. 7 These values indicate that the charge was not complete in the second and third 8 cycle, mainly in the negative compartment. This fact could explain the lower values of 9 charge observed in the Figure 4 during those cycles. On the other hand, if both operation 10 modes are compared, the SOC values of the wind-charging mode are smaller than the 11 ones for the galvanostatic-charging mode. Thus, it seems that the wind profiles, (i.e. when 12 a variable current is supplied with random periods during which the VRFB is not charged 13 and some discharge process could occurs due to the instability of the V2+ specie) lead to 14 lower values of SOC in the negative compartment. 15 Figure 8 shows the Ragone plots obtained for the battery for both operation modes. 16 Slightly lower values are obtained when the VRFB underwent wind-charging, although 17 for both charging modes the obtained values were close to the typical and expected values 18 for the flow battery technology. It is to say, power density values around 1-1.5 W kg-1 19 and energy density values around 6-25 W h kg-1 which are in agreement with other values 20 found in literature for this kind of technology [61]. 21 CONCLUSIONS 22 The application of discontinuous values of electric current (characteristic of wind energy) 23 in charge cycles of VRFB results in a slightly poorer performance of the system, as 24 compared to a VRFB charged galvanostatically. Although, the differences between 12PDF Image | Vanadium Redox Flow Batteries for wind turbines
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