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Harmonic Analysis of LV distribution networks with high PV penetration

Harmonic Analysis of LV distribution networks with high PV penetration
Harmonic Analysis of LV distribution networks with high PV penetration
This paper presents a harmonic study of different parallel photovoltaic (PV) systems connected to a low voltage distribution network to identify potential resonance between PV inverters and system impedance. LCL filters are commonly employed in PV inverters and recommended by IEEE 929-2000. These filters, however, by interacting with each other as well as with the system, may generate multiple harmonic resonances at the Point of Common Coupling (PCC). The harmonic modelling of the current source and the resonance mechanism is presented and explained through mathematical analysis. The resonance peaks and the voltage harmonic distortion can be efficiently attenuated by adding a passive damping resistor in the filter, the value of which may be obtained from the parametric results. Moreover, the potential of operating the PV as an active power filter is considered, by modelling the harmonic source of the PV under an out-of-phase strategy, to achieve a cancellation effect of the injected harmonic currents at the PCC. The reported simulation results suggest that the multi-resonance adverse effects caused by different PVs may be significantly mitigated and will not cause real problems in low voltage networks.
Harmonic resonance, LCL filter, PV system, Resonance damping, Harmonic cancellation
IEEE
Deng, Zhida
e059baea-8a79-4e08-ad14-fa30d4feba68
Rotaru, Mihai
c53c5038-2fed-4ace-8fad-9f95d4c95b7e
Sykulski, Jan
d6885caf-aaed-4d12-9ef3-46c4c3bbd7fb
Deng, Zhida
e059baea-8a79-4e08-ad14-fa30d4feba68
Rotaru, Mihai
c53c5038-2fed-4ace-8fad-9f95d4c95b7e
Sykulski, Jan
d6885caf-aaed-4d12-9ef3-46c4c3bbd7fb

Deng, Zhida, Rotaru, Mihai and Sykulski, Jan (2017) Harmonic Analysis of LV distribution networks with high PV penetration. In 2017 International Conference on Modern Power Systems (MPS). IEEE. 6 pp . (doi:10.1109/MPS.2017.7974392).

Record type: Conference or Workshop Item (Paper)

Abstract

This paper presents a harmonic study of different parallel photovoltaic (PV) systems connected to a low voltage distribution network to identify potential resonance between PV inverters and system impedance. LCL filters are commonly employed in PV inverters and recommended by IEEE 929-2000. These filters, however, by interacting with each other as well as with the system, may generate multiple harmonic resonances at the Point of Common Coupling (PCC). The harmonic modelling of the current source and the resonance mechanism is presented and explained through mathematical analysis. The resonance peaks and the voltage harmonic distortion can be efficiently attenuated by adding a passive damping resistor in the filter, the value of which may be obtained from the parametric results. Moreover, the potential of operating the PV as an active power filter is considered, by modelling the harmonic source of the PV under an out-of-phase strategy, to achieve a cancellation effect of the injected harmonic currents at the PCC. The reported simulation results suggest that the multi-resonance adverse effects caused by different PVs may be significantly mitigated and will not cause real problems in low voltage networks.

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Published date: 13 July 2017
Venue - Dates: The 7th International Conference on Modern Power Systems (MPS 2017), Cluj-Napoca, Romania, 2017-06-06 - 2017-06-09
Keywords: Harmonic resonance, LCL filter, PV system, Resonance damping, Harmonic cancellation

Identifiers

Local EPrints ID: 415199
URI: http://eprints.soton.ac.uk/id/eprint/415199
PURE UUID: 02877192-db4d-4eba-883b-5ec002beebd8
ORCID for Zhida Deng: ORCID iD orcid.org/0000-0002-8448-1934
ORCID for Jan Sykulski: ORCID iD orcid.org/0000-0001-6392-126X

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Date deposited: 02 Nov 2017 17:30
Last modified: 17 Dec 2019 02:04

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Author: Zhida Deng ORCID iD
Author: Mihai Rotaru
Author: Jan Sykulski ORCID iD

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