Innovative Grid-Connected Photovoltaic Systems Control Based on Complex-Vector-Filter

Abstract

The research presented in this paper explains how the complex-vector-filter (CVF) method can help in minimizing the current harmonic of a grid-tied photovoltaic system. In fact, the harmonic-free positive sequence (HFPS) load current is used to produce referential sinusoidal currents. This control stabilizes the grid’s currents under unbalanced load currents, as well as mitigates undesirable harmonic load currents, while feeding clean active power to the grid. Thanks to the proposed controller, the performance, such as robustness, as well as the stability and dynamics of the CVF are more effective compared to the proportional-integral (PI) with phase-locked-loop (PLL) controller. Moreover, the CVF ensures robustness and stability during the synchronization between the photovoltaic (PV) generator and the utility grid system. The PI&PLL control presents higher active and reactive power fluctuations during synchronization. On the other hand, the CVF ensures the elimination of the reactive power fluctuations during synchronization. The performance of the proposed CVF is validated by simulation through MATLAB software. Under all conditions, the grid current, considering harmonics, is within the limits set by the IEEE-519 power quality standard, where a total harmonic distortion (THD) of 1.56% was achieved in the case of feeding a non-linear load.

Optimal control for a photovoltaic integrated grid system using PSO and modified whale optimization to enhance power quality

“…In the N-dimensional problem space, each particle has a position x i = (x i1 ,x i2 ,K,x iN ) and a velocity v i = (v i1 ,v i2 ,K v iN ) where I signifies the ith particle and N denotes the problem dimension or a number of unknown variables. After finding particle best (P best ) and global best (G best ), the following equation (10) and ( 9) is used to update the location and velocity of the particles:…”

“…The solar cell, which transforms solar irradiance into direct current, is a fundamental component of a PV system. When connecting a PV system to the grid, a highly effective converter is needed to convert the DC power to AC [10,11]. To evaluate the effectiveness of the system in terms of power flow regulation and grid synchronization, the optimization-based MPPT controller is implemented in the gridconnected system [12].…”