Muhammad Ammirrul Atiqi Mohd Zainuri

Dual-fuzzy based MPPT for dual-load operation with photovoltaic SEPIC converter

In this paper, a dual load operation with dual maximum power point tracking (MPPT) for standalone photovoltaic (PV) system is introduced. This work investigates performance of PV system with dual load operation and variable irradiance by using proposed fuzzy based dual MPPT. The algorithm together with PV module of Kyocera KD210GH-2PU connected to PV SEPIC dc-dc converter was simulated in MATLAB-Simulink. Its performance has been compared with perturb and observe (P&O). Analysis on the effect of input power and output voltage at the load side when duty cycle and irradiance change have been discussed. From the results and analysis, dual fuzzy MPPT with dual load shows that maximum power can be obtained at lower irradiance by using higher resistance load and during high irradiance, lower resistance is needed in order to achieve maximum power. Different irradiance levels requires different values of resistance load to achieve maximum power and these only can be done using dual fuzzy MPPT with dual loads.

Improved ADALINE Harmonics Extraction Algorithm for Boosting Performance of Photovoltaic Shunt Active Power Filter under Dynamic Operations

This paper presents improved harmonics extraction based on Adaptive Linear Neuron (ADALINE) algorithm for single phase photovoltaic (PV) shunt active power filter (SAPF). The proposed algorithm, named later as Improved ADALINE, contributes to better performance by removing cosine factor and sum of element that are considered as unnecessary features inside the existing algorithm, known as Modified Widrow-Hoff (W-H) ADALINE. A new updating technique, named as Fundamental Active Current, is introduced to replace the role of the weight factor inside the previous updating technique. For evaluation and comparison purposes, both proposed and existing algorithms have been developed. The PV SAPF with both algorithms was simulated in MATLABSimulink respectively, with and without operation or connection of PV. For hardware implementation, laboratory prototype has been developed and the proposed algorithm was programmed in TMS320F28335 DSP board. Steady state operation and three critical dynamic operations, which involve change of nonlinear loads, off-on operation between PV and SAPF, and change of irradiances, were carried out for performance evaluation. From the results and analysis, the Improved ADALINE algorithm shows the best performances with low total harmonic distortion, fast response time and high source power reduction. It performs well in both steady state and dynamic operations as compared to the Modified W-H ADALINE algorithm.

Performance evaluation of Modified Widrow-Hoff ADALINE under effect of photovoltaic with shunt active power filter

This paper investigates performances of Modified Widrow-Hoff ADALINE as harmonics extraction algorithm under effect of photovoltaic (PV) integrated with shunt active power filter (SAPF). Integration of PV with SAPF gives high advantages in terms of energy source and power quality. The dependable on grid supply current reduces as PV current may support good amount of current to the load. However, with off-on operation and various irradiance levels of the PV, a good harmonics extraction algorithm is needed. Meanwhile, Modified Widrow-Hoff ADALINE is already proven before in SAPF functionality, however, its performance should further be evaluated under integration of PV with SAPF. Therefore, this algorithm is proposed, and further designed and developed for PV based SAPF, as simulated in MATLAB/Simulink. From the simulation results, the Modified Widrow-Hoff algorithm shows good performances for PV based SAPF with low THD values, fast response times and reduced source power from the grid under various levels of irradiance.