A Grid-Supporting Photovoltaic System Implemented by a VSG with Energy Storage

Huadian Xu, Jianhui Su, Ning Liu and Yong Shi
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Huadian Xu: School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 23009, China
Jianhui Su: School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 23009, China
Ning Liu: School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 23009, China
Yong Shi: School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 23009, China

Energies, 2018, vol. 11, issue 11, 1-19

Abstract: Conventional photovoltaic (PV) systems interfaced by grid-connected inverters fail to support the grid and participate in frequency regulation. Furthermore, reduced system inertia as a result of the integration of conventional PV systems may lead to an increased frequency deviation of the grid for contingencies. In this paper, a grid-supporting PV system, which can provide inertia and participate in frequency regulation through virtual synchronous generator (VSG) technology and an energy storage unit, is proposed. The function of supporting the grid is implemented in a practical PV system through using the presented control scheme and topology. Compared with the conventional PV system, the grid-supporting PV system, behaving as an inertial voltage source like synchronous generators, has the capability of participating in frequency regulation and providing inertia. Moreover, the proposed PV system can mitigate autonomously the power imbalance between generation and consumption, filter the PV power, and operate without the phase-locked loop after initial synchronization. Performance analysis is conducted and the stability constraint is theoretically formulated. The novel PV system is validated on a modified CIGRE benchmark under different cases, being compared with the conventional PV system. The verifications demonstrate the grid support functions of the proposed PV system.

Keywords: coordination control; energy storage; grid support function; inertia; photovoltaic; virtual synchronous generator (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 (4)

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