Design and Application of the Passive Filters for Improved Power Quality in Stand-alone PV Systems

Abstract

Harmonic components have developed in power systems due to the nonlinear properties of the circuit components utilized in power electronics-based products and their rapid application. Power systems rely on fundamental quantities like sinusoidally varying voltage and current, which oscillate at a frequency of 50 Hz. The standard restrictions of IEEE-519-1992 are utilized as a benchmark in this study. To generate the best output, the total harmonic distortion (THD) should be decreased below the limit even for certain individual harmonic numbers, and reflect the power factor output. Using the results of the simulation and projections for each mitigation strategy, by using this methodology, the THD <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">I</inf> can be reduced below the IEEE-519 standard while also providing cost and electrical advantages. Analyzed and modelled is the PV system, which comprises solar panels, a DC-DC converter, a DC-AC inverter, and a nonlinear load. This paper discusses the fundamentals of filter design and PV system components. It also discusses harmonics' causes and effects, as well as ways to the improvement of power factor (PF), and power quality (PQ) and to make sure that our power systems, do protect all the equipment connected to the PV system. A proposed standalone PV system and a Passive LLCL filter were designed to reduce current total harmonic distortion (THD <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">I</inf> ) and voltage total harmonic distortion (THDv). The non-linear loads and the secondary side of the inverter are separated by an LLCL passive filtration, and simulation results obtained with MATLAB/Simulink software are consistent with the theoretical study. The values of THD <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">V</inf> and THD <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">I</inf> decreased from 90.88% to 1.967% and 74.24% to 1.95%, respectively.