Performance Evaluation and Filter Design Aspects of Single-Phase Inverter under Different Loading Conditions

ABSTRACT This paper describes the power quality issues at the output of an inverter. The role of a filter and its design aspects at the output of a single-phase inverter in order to minimize the different harmonic content associated with various modulation schemes is illustrated. The relationship of the cut-off frequency of a second-order filter along with the switching frequency as well as on the type of modulation is established. The procedure to choose the values of L and C components of LC filter to reduce the overall THD following the IEEE std.1547 is also illustrated. The performance of the total system for different linear and non-linear loading conditions along with variations in input voltage and output loading is evaluated. The entire system and its performance is verified using MATLAB-based simulink models and satisfactory results are obtained. Abbreviations: CT: current transformer; MI: modulation index; MPWM: multi pulse width modulation; PI controller: proportional integral controller; PR controller: proportional-resonant controller PWM: pulse width modulation; SPWM: sinusoidal pulse width modulation; THD: total harmonic distortion; VT: voltage transformer

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