Adaptive-MPPT-Based Control of Improved Photovoltaic Virtual Synchronous Generators

Xiangwu Yan, Jiajia Li, Ling Wang, Shuaishuai Zhao, Tie Li, Zhipeng Lv and Ming Wu
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Xiangwu Yan: Key Laboratory of Distributed Energy Storage and Micro-Grid of Hebei Province, North China Electric Power University, Baoding 071003, China
Jiajia Li: Key Laboratory of Distributed Energy Storage and Micro-Grid of Hebei Province, North China Electric Power University, Baoding 071003, China
Ling Wang: Key Laboratory of Distributed Energy Storage and Micro-Grid of Hebei Province, North China Electric Power University, Baoding 071003, China
Shuaishuai Zhao: Key Laboratory of Distributed Energy Storage and Micro-Grid of Hebei Province, North China Electric Power University, Baoding 071003, China
Tie Li: State Grid Liaoning Electric Power Research Institute, Shenyang 110000, China
Zhipeng Lv: China Electric Power Research Institute (CEPRI), Beijing 100192, China
Ming Wu: China Electric Power Research Institute (CEPRI), Beijing 100192, China

Energies, 2018, vol. 11, issue 7, 1-18

Abstract: The 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.

Keywords: two-stage photovoltaic power; virtual synchronous generator; adaptive-MPPT (maximum power point tracking); improved-VSG (virtual synchronous generator); power matching (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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