TY - JOUR
T1 - Harmonic current prediction by impedance modeling of grid-tied inverters
T2 - A 1.4 MW PV plant case study
AU - Pereira, Heverton A.
AU - Freijedo, Francisco D.
AU - Silva, M. M.
AU - Mendes, V. F.
AU - Teodorescu, R.
PY - 2017/12
Y1 - 2017/12
N2 - Grid-tied inverters are the main responsible for the successful integration of photovoltaic (PV) plants in the power grid. Two important challenges are the integration of power plants based-inverters and their contribution to the power system quality. This work analyzes the features of inverter impedance models when used in harmonic integration studies. It is aimed to estimate the harmonic current contribution as a function of the background harmonic voltages components. Time domain simulations based on detailed and average models are compared with the impedance model developed in frequency domain. In grids with harmonic voltages, impedance models can predict the current distortion for all active power injection scenarios. Furthermore, measurements in a 1.4 MW PV plant connected in a distributed grid are used to validate the simulation based on impedance models during different power injections and harmonic voltage profiles. Results reinforce that impedance models can represent with relatively accuracy the harmonic current emitted by the PV plants at the point of common coupling (PCC). Lastly, a stress test is performed to show how a variation in the harmonic voltage phase angle impacts the PV plant harmonic emission.
AB - Grid-tied inverters are the main responsible for the successful integration of photovoltaic (PV) plants in the power grid. Two important challenges are the integration of power plants based-inverters and their contribution to the power system quality. This work analyzes the features of inverter impedance models when used in harmonic integration studies. It is aimed to estimate the harmonic current contribution as a function of the background harmonic voltages components. Time domain simulations based on detailed and average models are compared with the impedance model developed in frequency domain. In grids with harmonic voltages, impedance models can predict the current distortion for all active power injection scenarios. Furthermore, measurements in a 1.4 MW PV plant connected in a distributed grid are used to validate the simulation based on impedance models during different power injections and harmonic voltage profiles. Results reinforce that impedance models can represent with relatively accuracy the harmonic current emitted by the PV plants at the point of common coupling (PCC). Lastly, a stress test is performed to show how a variation in the harmonic voltage phase angle impacts the PV plant harmonic emission.
KW - Distributed system
KW - Grid-tied inverter
KW - Harmonic current emission
KW - Impedance model
KW - Photovoltaic (PV) plant
KW - Voltage-source converter (VSC)
UR - http://www.scopus.com/inward/record.url?scp=85019762450&partnerID=8YFLogxK
U2 - 10.1016/j.ijepes.2017.05.009
DO - 10.1016/j.ijepes.2017.05.009
M3 - Journal article
AN - SCOPUS:85019762450
SN - 0142-0615
VL - 93
SP - 30
EP - 38
JO - International Journal of Electrical Power and Energy Systems
JF - International Journal of Electrical Power and Energy Systems
ER -