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@ARTICLE{Astakhov:877593,
      author       = {Astakhov, Oleksandr and Merdzhanova, Tsvetelina and Kin,
                      Li-Chung and Rau, Uwe},
      title        = {{F}rom room to roof: {H}ow feasible is direct coupling of
                      solar-battery power unit under variable irradiance?},
      journal      = {Solar energy},
      volume       = {206},
      issn         = {0038-092X},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2020-02315},
      pages        = {732 - 740},
      year         = {2020},
      abstract     = {Integration of photovoltaics (PV) with electrical energy
                      storage (battery) is a straightforward approach to turn
                      intermittent power source into stable power supply. Power
                      coupling, or power matching, between PV-device, a battery,
                      and a load is most frequently performed with aid of maximum
                      power point tracking (MPPT) electronics. MPPT electronics
                      provides high flexibility as for PV and load impedances, and
                      irradiance, however, it brings in additional cost, and
                      complexity, power overhead, potential reliability issues,
                      and interference signals. On the other hand, direct coupling
                      via preselection of PV and battery parameters is a simple
                      scalable and highly efficient alternative to MPPT for a
                      specific set of conditions. We explore with modeling how far
                      a directly coupled PV-battery unit can stay power-matched
                      under various conditions, and demonstrate feasibility of
                      excellent power matching over orders of magnitude of
                      irradiance and a wide range of load resistances. Both a
                      PV-harvester in an office room with low irradiance,
                      non-demanding load, and high autonomy, and a PV-system on a
                      roof with high irradiance, demanding load, and partial
                      autonomy, can operate efficiently without MPPT electronics
                      if an appropriate battery is included. This result
                      emphasizes the role of a battery as an impedance matching
                      element besides storage functionality in a directly matched
                      PV-system.},
      cin          = {IEK-5},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-5-20101013},
      pnm          = {121 - Solar cells of the next generation (POF3-121)},
      pid          = {G:(DE-HGF)POF3-121},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000566928700009},
      doi          = {10.1016/j.solener.2020.06.033},
      url          = {https://juser.fz-juelich.de/record/877593},
}