E-Thesis 310 views 189 downloads
A Single Phase Standalone Residential Photovoltaic Energy Management System / MANESH PATEL
Swansea University Author: MANESH PATEL
DOI (Published version): 10.23889/SUThesis.70854
Abstract
A Single Phase Standalone Photovoltaic Energy Management System (SPSAPVEMS) is presented. This SPSAPVEMS is comprised of an interleaved battery charging sub-system, and an interleaved switched capacitor inverter sub-system and has been developed to effectively control the Photovoltaic (PV) array, ba...
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Swansea
2025
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| Institution: | Swansea University |
| Degree level: | Doctoral |
| Degree name: | Ph.D |
| Supervisor: | Z, Zhou |
| URI: | https://cronfa.swan.ac.uk/Record/cronfa70854 |
| Abstract: |
A Single Phase Standalone Photovoltaic Energy Management System (SPSAPVEMS) is presented. This SPSAPVEMS is comprised of an interleaved battery charging sub-system, and an interleaved switched capacitor inverter sub-system and has been developed to effectively control the Photovoltaic (PV) array, battery, and load voltage in a standalone energy management system for residential applications in off-grid solutions. A detailed literature review is presented that summarises the current topologies of the various Energy Management System (EMS) subsystems and identifies areas for improvement as a focus point of this study. One of the core sub-systems of the SPSAPVEMS is the inverter, an interleaved switched capacitor single-phase inverter for a Standalone PV System with Battery Storage is proposed with a novel control strategy based on the combination of Perturb &Observation (P&O) Maximum Power Point Tracking (MPPT) by phase shifted unipolar sinusoidal Pulse Width Modulation (PWM) with an Route Mean Squared (RMS) feedback loop to modulate the reference signal. The proposed modified interleaved inverter in this configuration shows improved harmonic performance compared with other existing methods, the simulation of the proposed inverter system recorded a Total Harmonic Distortion (THD) of 1.81% for the in-phase output current and voltage. This can be attributed to the interleaving of the switched capacitors that reduces the output ripple of the circuit. A second sub-system of the SPSAPVEMS is the single-phase bidirectional Direct Current (DC)/DC battery charger with a combined P&O MPPT and current control strategy is described and compared with an analysis of the existing battery charging techniques published in the industry.The conclusion of this study found a faster response time and reduced component count compared to a typical MPPT controlled boost converter in parallel to a voltage-controlled battery charger or other multiport solutions. A MATLAB/Simulink based simulation circuit was developed and used to validate the performance of the SPSAPVEMS. The system has been designed to respond to varying weather and load conditions as the battery supplements power to the home load when the PV output is impacted by variable conditions. In practice, a residential PV system will be exposed to changeable irradiance and temperature. MATLAB/Simulink package has been used to simulate and analyse the system behaviour.The results conclude that after reaching steady state, the system is responsive to the variable conditions.The combined MPPT, Current Control and RMS feedback voltage control methodologies allow power flow to be distributed across the load with minimal losses from multiple conversions or a high volume of components. |
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| Keywords: |
PV, Standalone PV, Single-Phase, Battery Charger, Bidirectional, Buck-Boost, P&O, MPPT, Interleaved, Switched Capacitor, H-Bridge Inverter, RMS Feedback, Phase-Shifted, PWM, Home Load |
| College: |
Faculty of Science and Engineering |