Adaptive-MPPT-Based Control of Improved Photovoltaic Virtual Synchronous Generators
AbstractThe lack of inertia and damping mechanism of photovoltaic (PV) grid-connected systems controlled by maximum power point tracking (MPPT) poses a challenge for the safety and stability of the grid. Virtual synchronous generator (VSG) technology has attracted wide attention, since it can make PV grid-connected inverter present the external characteristics of a synchronous generator (SG). Nevertheless, traditional PV-VSG is generally equipped with an energy storage device, which leads to many problems, such as increased costs, space occupation, and post-maintenance. Thus, this paper proposes a two-stage improved PV-VSG control method based on an adaptive-MPPT algorithm. When PV power is adequate, the adaptive-MPPT allows the PV to change the operating point within a stable operation area to actualize system supply-demand, matching in accordance to the load or dispatching power demand; when PV power is insufficient, PV achieves traditional MPPT control to reduce power shortage; simultaneously, improved VSG control prevents the DC bus voltage from falling continuously to ensure its stability. The proposed control approach enables the two-stage PV-VSG to supply power to loads or connect to the grid without adding additional energy storage devices, the effectiveness of which in off-grid and grid-connected modes is demonstrated by typical simulation conditions. View Full-Text
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Yan, X.; Li, J.; Wang, L.; Zhao, S.; Li, T.; Lv, Z.; Wu, M. Adaptive-MPPT-Based Control of Improved Photovoltaic Virtual Synchronous Generators. Energies 2018, 11, 1834.
Yan X, Li J, Wang L, Zhao S, Li T, Lv Z, Wu M. Adaptive-MPPT-Based Control of Improved Photovoltaic Virtual Synchronous Generators. Energies. 2018; 11(7):1834.Chicago/Turabian Style
Yan, Xiangwu; Li, Jiajia; Wang, Ling; Zhao, Shuaishuai; Li, Tie; Lv, Zhipeng; Wu, Ming. 2018. "Adaptive-MPPT-Based Control of Improved Photovoltaic Virtual Synchronous Generators." Energies 11, no. 7: 1834.
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