A decentralized control strategy for single‐phase cascaded photovoltaic inverters with MPPT ability

Abstract

Cascaded inverters can improve efficiency and reduce cost, so it is widely used in photovoltaic (PV) grid connected power generation system. However, aging or partial shielding of PV panels will lead to their different maximum power points (MPP). This paper proposes a decentralized control strategy for grid‐connected cascaded PV inverters without any communication, which is capable of integrating PV inverters of different capacities connected in series into the grid, and enable them to achieve maximum power point tracking (MPPT) independently. Compared with the traditional centralized control method relying on real‐time communication, the proposed scheme has advantages of improved reliability and decreased costs. The overall system stability is analysed, and the stability condition is derived as well. The Hardware‐In‐the‐Loop test results show that all the inverters in the cascaded system have their output frequency and voltage phase synchronized autonomously, and achieve MPPT independently even in the presence of variation of light condition. Thus, the feasibility of the proposed method is verified.

Investigation of novel control strategies for grid-connected photovoltaic inverters

“…They reflect a profound understanding of the complex interplay between technology, energy, and the environment, paving the way for a future where renewable energy is not just a part of the grid but a seamlessly integrated, intelligent, and responsive component of our energy ecosystem. The journey of exploration and innovation is far from over; it is continually evolving, propelled by the relentless pursuit of efficiency, sustainability, and harmony with the broader energy infrastructure [20][21][22]. As we stand on the brink of this transformative era, the collective endeavors in advanced control strategies for grid-connected photovoltaic inverters are not just shaping the future of renewable energy but are also redefining the paradigms of power generation, distribution, and consumption.…”