THREE-PHASE INVERTERS BASED ON ADAPTATIVE RESSONANT CONTROLLERS TO HARMONIC CURRENT COMPENSATION IN PHOTOVOLTAIC SYSTEMS
DOI:
https://doi.org/10.59627/cbens.2016.1905Keywords:
Solar Energy, multifunctional inverter, harmonic compensationAbstract
This paper presents a three-phase inverter control scheme based on proportional multi resonant controllers (PMR). In the proposed strategy, the inverter must be able to compensate harmonics, besides inject the maximum power obtained from the solar panel in the system. Once the inverter hardly ever operates in its nominal power due, e.g. to variations on the irradiance level, the use of this device to ancillary services optimizes the use of the energy supplied by him. The harmonic detection is given by two second order generalized integrators – phase locked loop (SOGI-PLL) cascaded, where the first detects the fundamental component of the current, and the second one detects the highest amplitude harmonic in the load current. The SOGI is synchronized according to the frequencies obtained dynamically by the PLL, the harmonic detection adapts quickly to the variations occurred in this components. Once the PR controllers are also dynamically adjusted, the control strategy is adaptive to changes occurred on the load current. This strategy allows partial compensation of the harmonic components of the current, decreasing the distortion that they generate in the electrical grid. The case study was made on the software PLECS, with the aid of a mathematical model of solar panel with a power of 25,5 kW.
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