Distorção harmônica de corrente produzida por inversores fotovoltaicos conectados à rede

• Autor(a) principal: Castro, Felipe de Carvalho
• Data de Publicação: 2019
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tede/10152
• topic: Distorção harmônica total de corrente; Inversor fotovoltaico; Irradiância solar; Microgeração distribuída; Sistemas fotovoltaicos conectados à rede; Total current harmonic distortion; Photovoltaic inverter; Solar irradiance; Distributed microgeneration; Grid connected photovoltaic systems; SISTEMAS ELETRICOS DE POTENCIA::GERACAO DA ENERGIA ELETRICA

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.