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Yujia Huo
Politecnico di Milano, Piazza Leonardo da Vinci, 32, 20133 Milano, Italy

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Journal article
Published: 17 April 2020 in Energies
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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.

ACS Style

Yujia Huo; Simone Barcellona; Luigi Piegari; Giambattista Gruosso. Reactive Power Injection to Mitigate Frequency Transients Using Grid Connected PV Systems. Energies 2020, 13, 1998 .

AMA Style

Yujia Huo, Simone Barcellona, Luigi Piegari, Giambattista Gruosso. Reactive Power Injection to Mitigate Frequency Transients Using Grid Connected PV Systems. Energies. 2020; 13 (8):1998.

Chicago/Turabian Style

Yujia Huo; Simone Barcellona; Luigi Piegari; Giambattista Gruosso. 2020. "Reactive Power Injection to Mitigate Frequency Transients Using Grid Connected PV Systems." Energies 13, no. 8: 1998.

Journal article
Published: 19 July 2019 in Electronics
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The integration of photovoltaic (PV) systems with the grid is undoubtedly an issue of great interest both in terms of energy production, but also as a support to the grid as an ancillary service, but to evaluate the performance of the use of PV in an unconventional way, it is necessary to have reference models to be applied to evaluate the characteristics and integration requirements. In this work, an ancillary service provided by a grid-connected PV is shown and a hardware in the loop simulation environment is created to simulate performances and integration issues.

ACS Style

Yujia Huo; Giambattista Gruosso. Ancillary Service with Grid Connected PV: A Real-Time Hardware-in-the-Loop Approach for Evaluation of Performances. Electronics 2019, 8, 809 .

AMA Style

Yujia Huo, Giambattista Gruosso. Ancillary Service with Grid Connected PV: A Real-Time Hardware-in-the-Loop Approach for Evaluation of Performances. Electronics. 2019; 8 (7):809.

Chicago/Turabian Style

Yujia Huo; Giambattista Gruosso. 2019. "Ancillary Service with Grid Connected PV: A Real-Time Hardware-in-the-Loop Approach for Evaluation of Performances." Electronics 8, no. 7: 809.