Efficiency of maximum power point tracking in photovoltaic system under variable solar irradiance
Brak miniatury
Data
2014
Autorzy
Tytuł czasopisma
ISSN czasopisma
Tytuł tomu
Wydawca
Division IV: Engineering Sciences of the Polish Academy of Sciences
Polska Akademia Nauk, Wydział IV Nauk Technicznych
Polska Akademia Nauk, Wydział IV Nauk Technicznych
Abstrakt
Field conditions decrease the energy output of photovoltaic (PV) systems, mainly due to excessive temperatures. However, in regions with moderate ambient temperatures, as in Poland, solar energy is commonly delivered with highly fluctuating irradiance. This
introduces yet another source of energy losses due to the non-ideal tracking of actual position of Maximum Power Point (MPP). Majority of PV-systems are equipped with DC/AC and grid-connected inverter. Since the solar energy flux is variable, an adequate
MPP-tracking algorithm is required to handle a wide range of load levels and face rapid changes of input power. Along with the essential DC/AC conversion, the quality of MPP-tracking must also be taken into account in evaluation of inverter efficiency.
The tracking in dynamic conditions has been addressed only recently. Several algorithms has been studied theoretically, experimentally or in laboratory conditions by applying artificial input test-patterns. This work takes the opposite approach by applying the recorded real-life solar irradiance and simulating the tracking behavior to study the problem for true field conditions in Poland. The simulation uses the unique high-quality irradiance data collected with 200 ms time resolution. The calculation of both static and
dynamic MPP-tracking efficiency has been performed for representative variable-cloudy day, applying commonly used Perturb&Observe tracking algorithm.
Opis
Słowa kluczowe
photovoltaics, MPP-tracking, inverter efficiency
Cytowanie
Bulletin of the Polish Academy of Sciences Technical Sciences, Vol. 62, Issue 4, 2014, Pages 713–721