About Harmonic Limitation of Photovoltaic Inverters
The increasing penetration of photovoltaic (PV) systems, consisting of PV panel and PV inverter, may introduce power quality issues to the distribution power system. One critical concern is the harmonic distortion. This paper proposes an analytical harmonic model of PV inverters to assess its harmonic impacts on the distribution systems.
The increasing penetration of photovoltaic (PV) systems, consisting of PV panel and PV inverter, may introduce power quality issues to the distribution power system. One critical concern is the harmonic distortion. This paper proposes an analytical harmonic model of PV inverters to assess its harmonic impacts on the distribution systems.
Intensive efforts have been made to articulate the strategies of eliminating or reducing harmonics distortions generated due to output of this conversion. This study aims to investigate the causes of harmonics in PV Inverters, effects of harmonics, mitigation techniques & recent integration requirements for harmonics.
An important component of the PV system is the passive filter, which attenuates the harmonic generated by inverter switching. The filter may reduce the inverter ability to compensate the harmonic currents. This work presents an investigation of inverter capability to provide HC of nonlinear loads.
The profile of harmonic content can vary significantly among the many commercially available UL listed PV inverters. Two examples, both taken from actual measurements, are shown in Fig. 2. In the first example, identified as Type-1, the inverter produces a total harmonic distortion (THD) of current slightly less than 3% (ITHD < 3%). For this PV .
Taking the typical grid symmetrical harmonic −5th, +7th, −11th and + 13th order harmonic as an example, the impedance network and the definition of harmonic amplification coefficient can be used to analyze the influence of photovoltaic inverter on the corresponding background harmonic characteristics.
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