Abstract
This paper proposes an approach to link photovoltaic arrays with the AC grid using Z-source inverter (ZSI) and quasi-Z-source inverter (QZSI) topologies. These topologies boost the DC-link voltage and invert it to AC voltage in one stage, resulting in a reduction in the overall system size and cost. The paper presents a control technique that fixes the DC-link voltage on the inverter bridge terminals, tracks the maximum power point (MPPT), and controls the amount and quality of power injected into the grid using unity power factor. The proposed control algorithm utilizes two independent control variables, shoot-through duty cycle (ST) and modulation index, to decouple the control of the DC and AC sides. The effectiveness of the proposed control technique is verified through simulations of a grid-connected PV system. The results demonstrate that the proposed system can efficiently extract maximum power from PV arrays while regulating the DC-link voltage and ensuring unity power factor operation. Additionally, experimental testing of ZSI/QZSI further confirms the results of analysis and simulation.
| Original language | English |
|---|---|
| Pages (from-to) | 6445-6456 |
| Number of pages | 12 |
| Journal | IEEE Transactions on Industry Applications |
| Volume | 59 |
| Issue number | 5 |
| Early online date | 12 May 2023 |
| DOIs | |
| Publication status | E-pub ahead of print - 12 May 2023 |
Keywords
- Capacitors
- Control systems
- decoupling control
- Equivalent circuits
- grid connected
- Inductors
- Inverters
- maximum power point tracking
- Photovoltaic
- standalone
- Topology
- unity power factor
- Voltage control
- Z-source inverter
- photovoltaic
- z-source inverter
- Decoupling control
ASJC Scopus subject areas
- Control and Systems Engineering
- Industrial and Manufacturing Engineering
- Electrical and Electronic Engineering
Documents and Links
- Elmorshedy, M. F. et al. (2023) A grid-connected PV system based on quasi-Z-source inverter with maximum power extraction
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