Abstract
A voltage source inverter (VSI) is the key component of grid-tied AC Microgrid (MG) which requires a fast response, and stable, robust controllers to ensure efficient operation. In this paper, a fuzzy logic controller (FLC)-based direct power control (DPC) method for photovoltaic (PV) VSI was proposed, which was modelled by modulating MG’s point of common coupling (PCC) voltage. This paper also introduces a modified grid synchronization method through the direct power calculation of PCC voltage and current, instead of using a conventional phase-locked loop (PLL) system. FLC is used to minimize the errors between the calculated and reference powers to generate the required control signals for the VSI through sinusoidal pulse width modulation (SPWM). The proposed FLC-based DPC (FLDPC) method has shown better tracking performance with less computational time, compared with the conventional MG power control methods, due to the elimination of PLL and the use of a single power control loop. In addition, due to the use of FLC, the proposed FLDPC exhibited negligible steady-state oscillations in the output power of MG’s PV-VSI. The proposed FLDPC method performance was validated by conducting real-time simulations through real time digital simulator (RTDS). The results have demonstrated that the proposed FLDPC method has a better reference power tracking time of 0.03 s along with reduction in power ripples and less current total harmonic distortion (THD) of 1.59%.
Highlights
Fossil fuel resources are frequently used to generate power in conventional power systems, which outcomes in the hasty diminution of fossil fuel, as well as augmented environmental pollution
PV-voltage source inverter (VSI) currents was less than 5%, which is in line with the IEC standard [44]; howev the current total harmonic distortion (THD) (4.967%) obtained by the phase-locked loop (PLL)-current control schemes (CCSs)-based power control method w very high, compared with the PVM theory (PVMT)-based FLC-based DPC (FLDPC) method’s current THD (1.59%)
For case-1, real-time simulation results show that the proposed FLDPC method was able to track both real and reactive power to their reference powers accurately and quickly
Summary
Fossil fuel resources are frequently used to generate power in conventional power systems, which outcomes in the hasty diminution of fossil fuel, as well as augmented environmental pollution. The presence of the feedforward decoupled control eliminated the coupling terms presented in the new control inputs from the nonlinear PCC voltage modulation (PVM), and two individual dynamics of the second order error signals of the real and reactive were obtained, using a feedback FLC strategy. To demonstrate the pre-eminence of the proposed FLDPC controller, real-time simulations of different conventional grid-tied MG power control methods were conducted, and their performances were compared with the proposed controller for various parameters of steady-state power oscillations, refence power tracking time and total harmonic distortions (THD) of VSI’s output current and voltage.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
