access icon openaccess Singular value decomposition-based dynamic response analysis of VSC-MTDC/AC systems for renewable energy integration

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 22/08/2018, Accepted 19/09/2018, Published 23/10/2018

The dynamic performance of voltage source converter-based multi-terminal high-voltage direct current (VSC-MTDC) grid for large-scale renewable energy integration is becoming a concern. This study proposes a system-level dynamic response model of wind farm (WF)-MTDC-main AC systems, and then analyses the dynamic performance based on the singular value decomposition (SVD) technique. In the modelling, an improved virtual synchronous machine control is developed, and the interaction between AC frequency and DC voltage can be readily described. Using the SVD technique, parameters of the controllers are tuned, thereby making the AC frequency and DC voltage deviations within the limitations. Some oscillation modes of the system are observed and virtual power system stabiliser is proposed to suppress the oscillations. Additionally, the oscillation can be mitigated by emulating capacitance-based inertia response. The efficiency of the proposed model and analysis is verified through the frequency-domain and time-domain results.

Inspec keywords: power grids; voltage-source convertors; singular value decomposition; voltage control; HVDC power convertors; power generation control; machine control; dynamic response; power transmission control; power system stability; HVDC power transmission; wind power plants; synchronous machines

Other keywords: improved virtual synchronous machine control; DC voltage deviations; system oscillation modes; VSC; large-scale renewable energy integration; voltage source converter-based multiterminal high-voltage direct current grid; WF; singular value decomposition-based dynamic response analysis; time-domain analysis; dynamic performance; SVD technique; wind farm-MTDC-main AC systems; frequency-domain analysis; system-level dynamic response model; AC frequency; VSC-MTDC-AC systems; virtual power system stabiliser; capacitance-based inertia response emulation

Subjects: Algebra; Power system control; d.c. transmission; Synchronous machines; Control of electric power systems; Algebra; Voltage control; Power convertors and power supplies to apparatus; Wind power plants

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