Synchronized Power Injection from PVA to Grid Using Synchronous Reference Frame and MPPT Under Different Operation Modes

Date of Award

5-2021

Degree Name

Doctor of Philosophy

Department

Electrical and Computer Engineering

First Advisor

Dr. Johnson Asumadu

Second Advisor

Dr. Massood Z. Atashbar

Third Advisor

Dr. Azim Houshyar

Keywords

Synchronized power injection, synchronous reference frame

Abstract

This dissertation work addresses the power sharing to ensure that Photovoltaic Array (PVA) is tightly synchronized into a grid seamlessly. Since the grid operates on three-phase AC supply, the PVA's DC voltage is converted to three-phase AC voltage for power injection into the grid. This is achieved by using a Synchronous Reference Frame (SRF) controller with a feedback extracted from the gird’s side voltage and currents values. The synchronization of the inverter is achieved using Phase-locked Loop (PLL) module, which determines the phase and frequency of the grid voltage. The PVA voltage is uncertain and depends on solar irradiation which is unpredictable. To address this, a Maximum Power Point Tracking (MPPT) technique is adopted, which controls the DC voltage from PVA. The MPPT technique controls the output voltage of the PVA with maximum power extraction using a DC-DC booster converter.

Experimental simulations of the proposed models using MATLAB Simulink under different environmental and operating conditions, such as variable solar irradiation conditions and load variation in the grid system, were completed.

Results show that the proposed SRF model allows PVA renewable sources integration into a three-phase grid that is capable of achieving synchronization. There is noticeable reduction in the harmonics generated at Point of Common Coupling (PCC) and therefore, reducing the damage to the system. The system provides high grid power under changing load conditions, maintains electrical power factor close to unity, and achieves voltage regulation by stabilization at PCC. The system remains highly stable and offers only 2.34% of total harmonic distortion. The proposed algorithm is less complex and has low computational cost as compared to existing algorithms found in literature. The proposed design is novel, complete and comprehensive with improved power quality. The Total Harmonic Distortion (THD) of the grid current is maintained below 2.5% as per the IEEE 519-1992 standard.

Access Setting

Dissertation-Abstract Only

Restricted to Campus until

6-15-2031

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