Reactive Power Injection to Mitigate Frequency Transients Using Grid Connected PV Systems

Yujia Huo, Simone Barcellona, Luigi Piegari and Giambattista Gruosso
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Yujia Huo: Politecnico di Milano, Dipartimento di Elettronica Informazione e Bioingegneria, Piazza Leonardo da Vinci 32, 20133 Milano, Italy
Simone Barcellona: Politecnico di Milano, Dipartimento di Elettronica Informazione e Bioingegneria, Piazza Leonardo da Vinci 32, 20133 Milano, Italy
Luigi Piegari: Politecnico di Milano, Dipartimento di Elettronica Informazione e Bioingegneria, Piazza Leonardo da Vinci 32, 20133 Milano, Italy
Giambattista Gruosso: Politecnico di Milano, Dipartimento di Elettronica Informazione e Bioingegneria, Piazza Leonardo da Vinci 32, 20133 Milano, Italy

Energies, 2020, vol. 13, issue 8, 1-24

Abstract: The increasing integration of renewable energies reduces the inertia of power systems and thus adds stiffness to grid dynamics. For this reason, methods to obtain virtual inertia have been proposed to imitate mechanical behavior of rotating generators, but, usually, these methods rely on extra power reserves. In this paper, a novel ancillary service is proposed to alleviate frequency transients by smoothing the electromagnetic torque of synchronous generators due to change of active power consumed by loads. Being implemented by grid-tied inverters of renewables, the ancillary service regulates the reactive power flow in response to frequency transients, thereby demanding no additional power reserves and having little impact on renewables’ active power generation. Differently from the active power compensation by virtual inertia methods, it aims to low-pass filter the transients of the active power required to synchronous generators. The proposed ancillary service is firstly verified in simulation in comparison with the virtual inertia method, and afterwards tested on processor by controller-hardware-in-the-loop simulation, analysing practical issues and providing indications for making the algorithm suitable in real implementation. The ancillary service proves effective in damping frequency transients and appropriate to be used in grid with distributed power generators.

Keywords: ancillary service; PV Plant; frequency-assisting; hardware-in-the-loop; Photovoltaic; DER (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: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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