TechRxiv
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Communication-Less Frequency Support from Offshore Wind Farms Connected to HVdc via Diode Rectifiers

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posted on 17.06.2020, 00:00 by Oscar Saborío-Romano, Ali Bidadfar, Jayachandra Naidu Sakamuri, Lorenzo Zeni, Ömer Göksu, Nicolaos Antonio Cutululis
Before diode rectifier (DR) technology for connecting offshore wind farms (OWFs) to HVdc is deployed, in-depth studies are needed to assess the actual capabilities of DR-connected OWFs to contribute to the secure operation of the networks linked to them. This study assesses the capability of such an OWF to provide communication-less frequency support (CLFS) to an onshore ac network. It is shown that the HVdc link’s offshore terminal direct voltage can be estimated from measurements at the OWF’s point of connection with the DR platform. Two different methods are proposed for implementing CLFS in the OWF active power controls. In Method 1, the estimated offshore terminal direct voltage is used for estimating the onshore frequency deviation. In Method 2, the actual offshore terminal direct voltage measurement is used instead. Unique features of the provision of CLFS from OWFs connected to HVdc via DRs are highlighted, and the dynamic and static performance of the CLFS control scheme is compared to that of the communication-based frequency support scheme. To assess the impact of parameter estimation errors on the provision of CLFS, a parametric sensitivity study is presented as well, and recommendations are given to increase accuracy.

The manuscript has been accepted for publication in IEEE Transactions on Sustainable Energy.

Funding

This work has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 691714.

History

Email Address of Submitting Author

osro@dtu.dk

ORCID of Submitting Author

0000-0001-9771-4955

Submitting Author's Institution

Department of Wind Energy, Technical University of Denmark

Submitting Author's Country

Denmark

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