Abstract
Harmonic distortion in power networks has greatly reduced power quality and this affects system stability. In order to mitigate this power quality issue, the shunt active power filter (SAPF) has been widely applied and it is proven to be the best solution to current harmonics. This paper evaluates the performance of the modified synchronous reference frame extraction (MSRF) algorithm with fuzzy logic controller (FLC) based current control pulse width modulation (PWM) inverter of three-phase three-wire SAPF to mitigate current harmonics. The proposed FLC is designed with a reduced amount of membership functions (MFs) and rules, and thus significantly reduces the computational time and memory size. Modeling and simulations of SAPF are carried out using MATLAB/Simulink R2012a with the power system toolbox under steady-state condition, and this is followed with hardware implementation using a TMS320F28335 digital signal processor (DSP), Specrum Digital Inc., Stafford, TX, USA. The results obtained demonstrate a good and satisfactory response to mitigate the harmonics in the system. The total harmonic distortion (THD) for the system has been reduced from 25.60% to 0.92% and 1.41% in the simulation study with and without FLC, respectively. Similarly for the experimental study, the SAPF can compensate for the three-phase load current by reducing THD to 5.07% and 7.4% with and without FLC, respectively.
Highlights
Nowadays the growth of power quality problems due to power electronic equipment such as adjustable speed drive, programmable logic controller, electronic lightning, together with other nonlinear loads, is an issue for power engineers
In order to evaluate the effectiveness of the proposed fuzzy logic controller (FLC)-based current control scheme, a comparative analysis is performed by comparing its performance with another similar current
In order to evaluate the effectiveness of the proposed FLC-based current control scheme, a comparative analysis is performed by comparing its performance with another similar current control scheme without using the FLC controller
Summary
Nowadays the growth of power quality problems due to power electronic equipment such as adjustable speed drive, programmable logic controller, electronic lightning, together with other nonlinear loads, is an issue for power engineers. Employing a proportional-integral (PI) controller in the current control scheme of the pulse width modulation voltage source inverter (PWM-VSI) of SAPF is troubling It requires precise linear mathematical models which are hard to obtain in practice. Due to its severe dynamic interactions among the flow of active and reactive power, it may not provide satisfactory results under parameter variations and load disturbances [13] These drawbacks are resolved with the introduction of fuzzy logic controller (FLC), as it does not require any tedious mathematical model and works with imprecise inputs. The hierarchical neuro-fuzzy approach requires the implementation of two-stage FLCs which greatly increases the complexity of the designed current control scheme.
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