TAILIEUCHUNG - Energy Storage Part 8

Tham khảo tài liệu 'energy storage part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 82 Energy Storage Measured quantities time mean values - symbols are as in - I1 A V1 V I2 A V2 V I3 A V3 V Idc A Vdc V lac A Vac V Without batteries 2 7 37 8 2 7 38 0 2 7 38 1 2 7 356 0 4 1 225 0 With batteries 3 1 37 2 3 2 37 7 3 2 37 5 2 7 356 0 4 2 224 0 Table IV. Results of measurements under balanced solar irradiation conditions Fig. 5. Electrical scheme of the experimentally tested 3 kWp grid-connected PV plant in presence of an artificially imposed partial shadowing of PV modules Measurements have been carried out for a total duration of one hour during the first interval of 15 minutes batteries are switched-off and all the PV modules are irradiated during the second interval of 15 minutes batteries are switched-off and two PV modules are artificially shadowed during the third interval of 15 minutes batteries are switched-on and all the PV modules are irradiated during the fourth interval of 15 minutes batteries are switched-on and two PV modules are artificially shadowed. The results are summarised in Table V in terms of registered time mean values. Energy Storage in Grid-Connected Photovoltaic Plants 83 Measured quantities time mean values - symbols are as in - I1 A V1 V I2 A V2 V I3 A V3 V Idc A Vdc V lac A Vac V Without batteries and all PV-modules irradiated 2 1 38 8 2 1 38 4 2 1 38 7 2 1 352 0 3 2 227 0 Without batteries and two PV-modules shadowed 1 2 36 8 1 2 37 9 1 2 38 1 1 2 349 0 1 8 224 0 With batteries and all PV-modules irradiated 1 9 37 2 2 2 37 7 2 0 37 7 2 3 347 0 3 6 223 0 With batteries and two PV-modules shadowed 1 6 37 1 8 36 7 1 6 36 9 1 9 353 0 2 9 226 0 Table V. Results of measurements under unbalanced solar irradiation conditions In order to better summarize the experimental results and to better appreciate what happens especially in case of unbalanced solar irradiation conditions with and without the use of batteries let us to define a Power Decay Coefficient PDC that is to say a coefficient that measures the decay rate

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