Distorção harmônica de corrente produzida por inversores fotovoltaicos conectados à rede
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2019-09-19
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Universidade Federal de Goiás
Resumo
This investigation addresses the total harmonic distortion of current (THDi) produced by
photovoltaic inverters installed in three different systems compounded by: a) photovoltaic
generator rated at 3.055 kWp and photovoltaic single-phase inverter by Eltek, model Theia,
rated at 2.9 kW; b) photovoltaic generator rated at 4.7 kWp and photovoltaic single-phase
inverter by Eltek, model Theia, rated at 4.4 kW; c) photovoltaic generator rated at 41.3 kWp
and photovoltaic three-phase inverter by Huawai, model SUN-2000-33KTL, with rated power
at 33 kW. These three systems are installed on roof-tops at the Electrical, Mechanical and
Computer Engineering School (EMC) of the Federal University of Goias (UFG). The percent
THDi and 3rd and 5th order rms harmonic currents were measured with a power quality
analyzer by Fluke, model 435-II, and a set of polynomial were achieved by means of linear
polynomial regression in order to represent the behaviors of percent THDi and of 3rd and 5 th
order rms harmonic currents as a function of global irradiance on horizontal plane and as
function of inverter loads. The linear polynomial regression of grade three was sufficient to
represent to represent the harmonic current behaviors produced by the solar inverters as a
function of irradiance or load. In addition, the percent THDi and of 3rd and 5th order rms
harmonic currents were classified into quartiles according to different ranges of solar
irradiation on horizontal plane as well as different ranges of inverter loads, and the respective
average values of rms harmonic currents and percent THDi to each one of the ranges were
assessed. In conclusion, the Eltek inverter rated at 4.4 kW and the Huawei inverter rated at
33 kW meet the ABNT NBR 16149:2013 and IEEE 1547-2018 standard recommendations. The
results regarding the Eltek inverter rated at 2.9 kW are not conclusive as the weather
conditions at the moment measures were taken did not allow the inverter power to reach
more than 62% of its rated power.
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CASTRO, F. C. Distorção harmônica de corrente produzida por inversores fotovoltaicos conectados à rede. 2019. 128 f. Dissertação (Mestrado em Engenharia Elétrica e da Computação) - Universidade Federal de Goiás, Goiânia, 2019.