NDLI: Subsynchronous oscillation of PV plants integrated to weak AC networks

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Subsynchronous oscillation of PV plants integrated to weak AC networks

Volume 13 (2019) : Issue 2, Feb

Volume 13 (2019) : Issue 1, Jan

IET Science, Measurement & Technology

IET Signal Processing

IET Wireless Sensor Systems

Micro & Nano Letters

The Journal of Engineering

Subsynchronous oscillation of PV plants integrated to weak AC networks

Content Provider	IET Digital Library
Author	Zhao, Shuqiang Li, Ren Gao, Benfeng Wang, Nan Zhang, Xi
Abstract	The grid-connected photovoltaic (PV) power is booming, and large-scale PV power is mostly integrated to grid through long transmission lines; however, PV systems may face the threat of subsynchronous oscillation (SSO) when AC system strength is weak. This study establishes the sequence impedance model of grid-connected PV system; mechanism and characteristic of SSO in PV plants integrated to weak AC networks are delved into through impedance-based analysis method. The results show that, under certain conditions, the impedance of PV system is capacitive in the subsynchronous frequency domain, when the networks are weak and the PV capacity is high, the resonance may occur between the capacitive PV system and inductive AC grid. In addition, a smaller proportional gain of current loop may increase the risk of SSO; however, a larger proportional gain and integral gain of phase-locked loop can ease the SSO. Finally, time domain simulation based on PSCAD/EMTDC is conducted to validate the results of the impedance-based analysis. The research here can provide guidance to the project of scaled PV plants integrated to weak AC networks in some sense.
Starting Page	409
Ending Page	417
Page Count	9
ISSN	17521416
Volume Number	13
e-ISSN	17521424
Issue Number	Issue 3, Feb (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rpg/13/3
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rpg.2018.5659
Journal	IET Renewable Power Generation
Publisher Date	2018-11-14
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	AC System Strength Capacitive PV System Control of Electric Power System EMTDC Grid-connected Photovoltaic Power Grid-connected PV System Impedance-based Analysis Method Inductive AC Grid Integral Gain Large-scale PV Power Long Transmission Line Oscillation Phase Locked Loop Photovoltaic Power System Power Grid Power Transmission Cables Power Transmission Line PSCAD PV Capacity Scaled PV Plant Sequence Impedance Model Solar Power Stations SSO Subsynchronous Frequency Domain Subsynchronous Oscillation Time Domain Analysis Time Domain Simulation Weak AC Network
Content Type	Text
Resource Type	Article
Subject	Renewable Energy, Sustainability and the Environment

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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