A DQ Synchronous Reference Frame Current Control for Grid Connected Photovoltaic Systems using Single Phase Cascaded H Bridge Multilevel Inverter
V. S. Kirthika Devi1, S. G. Srivani2
1V. S. Kirthika Devi*, VTU Research scholar, Department of Electrical and Electronics Engineering, Amrita School of Engineering, Bengaluru,Amrita Vishwa Vidyapeetham, India.
2S. G. Srivani, Department of Electrical and ElectronicsEngineering, RV College of Engineering Bengaluru, India.
Manuscript received on November 22, 2019. | Revised Manuscript received on December 15, 2019. | Manuscript published on December 30, 2019. | PP: 2814-2822 | Volume-9 Issue-2, December, 2019. | Retrieval Number: B3174129219/2019©BEIESP | DOI: 10.35940/ijeat.B3174.129219
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: This paper projects a high performance decoupled current control using a dq synchronous reference frame for single-phase inverter. For the three-phase inverter the conversion from AC to DC with Proportional Integral controller grants to obtain steady state error for AC Voltages and currents but has a few challenges with the single-phase systems. Hence, an orthogonal pair (β) is created by shifting the phase by one quarter cycle with respect to the real component (α) which is needed for the transformation from stationary to rotating frame. The synchronous reference frame control theory helps in controlling the AC voltage by using DC signal as the reference with the proportional integrator controllers. The implementation of the control is done with two-stage converter with LCL filter for a single-phase photovoltaic system. A modified MPPT Incremental conductance algorithm along with decoupled current control helps in regulating the active and reactive power infused into the grid where the power factor is improved, the efficiency of the system is increased above 95% and total harmonic distortion for current is also reduced to3%. The results have been validated using MATLAB.
Keywords: Photovoltaic(PV), boost converter, Maximum Power Point Tracking (MPPT), Maximum Power Point (MPP), Incremental conductance (IC),dq Synchronous Reference Frame (SRF), Phase Shifted Pulse Width Modulation (PSPWM), Phase locked loop (PLL), Total Harmonic Distortion (THD).