Análise da propagação de harmônicas de alta frequência em uma rede de distribuição de baixa tensão
Keywords: supraharmonics, harmonic propagation, electric power distribution, power quality
AbstractThe development of solar photovoltaic generation systems into the grid, electric vehicles and electronic mass-market equipment is characterized by the growth of high frequency emissions in the range of 2–150 kHz. These high-frequency emissions, known as supraharmonics, negatively affect the power quality of electrical distribution systems. It is important to investigate and analyze the propagation of these high frequency currents on the grid for diagnosis and mitigation of any disturbances caused by them. This paper aims to study the propagation of supraharmonic emissions in the real power grid as presented in measurements in a connected photovoltaic inverter and simulations of a typical low voltage distibution grid. The simulations was made by using MATLAB Simulink® software to model a distribution grid including supraharmonic current sources allocated in different buses of the system. The results show that the voltage harmonic distortion levels depend on the frequency and impedance along the grid. Further, the results also explore the possibilities of this type of system, showing the consideration of a bank of capacitors (or the intrinsic capacitances of the system) leads almost the total attenuation of supra-harmonic voltages levels.