Journal
ENERGIES
Volume 11, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/en11061375
Keywords
cascaded inverters; PV inverters; PV generation architecture; decentralized control; frequency self-synchronization
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Funding
- National Natural Science Foundation of China [61573384, 51677195]
- Fundamental Research Funds for the Central Universities of Central South University [2018zzts531]
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This paper proposes a communication-free decentralized control for grid-connected cascaded PV inverter systems. The cascaded PV inverter system is an AC-stacked architecture, which promotes the integration of low voltage (LV) distributed photovoltaic (PV) generators into the medium/high voltage (MV/HV) power grid. The proposed decentralized control is fully free of communication links and phase-locked loop (PLL). All cascaded inverters are controlled as current controlled voltage sources locally and independently to achieve maximum power point tracking (MPPT) and frequency self-synchronization with the power grid. As a result, control complexity as well as communication costs are reduced, and the system's reliability is greatly enhanced compared with existing communication-based methods. System stability and dynamic performance are evaluated by small-signal analysis to guide the design of system parameters. The feasibility and effectiveness of the proposed solution are verified by simulation tests.
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