Advanced controls of power electronic modules for PV-based plug-n-play Dc microgrids and Dc-Ac grids interface
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Date
2020-10-19
Authors
Li, Dong
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Abstract
Billions of people are living in energy poverty or living with no access to electricity. However, the conventional energy solution with large power plants and long transmission lines is no longer effective in these areas due to the high cost and geographical limitations. Alternatively, photovoltaic (PV) based microgrid systems have been provided with new business models to make electricity affordable to households. At the same time, the price dropping of photovoltaic (PV) panels & energy storage devices and development of power electronic technologies make dc microgrid an attractive solution for the future distribution systems, especially for electrification in rural areas.
Microgrid, which integrates generation, energy storage and load, has become an important way of renewable energy harvesting. However, it still requires centralized plan, design and installation, which cause high capital investment and long leading time. These drawbacks have been strangling the development of microgrid, especially in rural areas. Plug-n-Play (PnP) microgrid has become a hot topic to address this problem. The PnP feature of microgrid can significantly simplify the design and installation process. The PnP feature also increases the expandability and flexibility of microgrids that the users can easily expand the microgrid system as their demand growing by simply adding new components.
This thesis studies advanced control methods for power electronic converters to achieve real PnP feature in dc microgrid systems and furtherly converting it to the utility ac grid. The proposed methods have considered specific application criteria of each power electronic converter, while maximizing the modularity and scalability. In general, the dc part of the microgrid utilizes dc bus signaling technology with ultra-high modularity, while the dc-ac grid interface part utilizing communication-based control to achieve accurate power sharing and voltage regulation.
This thesis provides a thorough research on advanced control methods of power electronic converters for PnP microgrid and its interface to ac grids. Prototypes with proposed control methods are built. All studies are supported by experimental verifications.
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Keywords
Microgrid, Rural electrification, PV generation, Decentralized control, Inverter, Droop control, Distributed generation, Module based
Citation
D. Li and C. N. M. Ho, "A Module-Based Plug-n-Play DC Microgrid With Fully Decentralized Control for IEEE Empower a Billion Lives Competition," in IEEE Transactions on Power Electronics, vol. 36, no. 2, pp. 1764-1776, Feb. 2021.
D. Li and C. N. Man Ho, "A Delay-Tolerable Master–Slave Current-Sharing Control Scheme for Parallel-Operated Interfacing Inverters With Low-Bandwidth Communication," in IEEE Transactions on Industry Applications, vol. 56, no. 2, pp. 1575-1586, March-April 2020
D. Li, C. N. M. Ho and K. K. M. Siu, "A Method for Solving Current Unbalance Problem of Paralleled Single-Phase Grid-Connected Unipolar-PWM Inverters With Common Dc Bus," in IEEE Transactions on Industry Applications, vol. 55, no. 6, pp. 7595-7603, Nov.-Dec. 2019.
D. Li, C. N. M. Ho, L. Liu and G. Escobar, "Reactive Power Control for Single-Phase Grid-Tie Inverters Using Quasi-Sinusoidal Waveform," in IEEE Transactions on Sustainable Energy, vol. 9, no. 1, pp. 3-11, Jan. 2018.
D. Li and C. N. Man Ho, "A Delay-Tolerable Master–Slave Current-Sharing Control Scheme for Parallel-Operated Interfacing Inverters With Low-Bandwidth Communication," in IEEE Transactions on Industry Applications, vol. 56, no. 2, pp. 1575-1586, March-April 2020
D. Li, C. N. M. Ho and K. K. M. Siu, "A Method for Solving Current Unbalance Problem of Paralleled Single-Phase Grid-Connected Unipolar-PWM Inverters With Common Dc Bus," in IEEE Transactions on Industry Applications, vol. 55, no. 6, pp. 7595-7603, Nov.-Dec. 2019.
D. Li, C. N. M. Ho, L. Liu and G. Escobar, "Reactive Power Control for Single-Phase Grid-Tie Inverters Using Quasi-Sinusoidal Waveform," in IEEE Transactions on Sustainable Energy, vol. 9, no. 1, pp. 3-11, Jan. 2018.