Admittance study of grid-connected VSCs for harmonic oscillatory instabilities

• Published in: IET generation, transmission & distribution Vol. 13; no. 18; pp. 4049 - 4060
• Main Authors: Sainz, Luis, Monjo, Lluis, Cheah-Mane, Marc, Liang, Jun, Gomis-Bellmunt, Oriol, Prieto-Araujo, Eduardo
• Format: Journal Article Publication
• Language: English
• Published: The Institution of Engineering and Technology 17.09.2019
• Subjects: admittance study; Anàlisi harmònica; Anàlisi matemàtica; appropriate VSC parameter values; Damping; Energia eòlica; Energies; grid‐connected VSC systems; grid‐connected VSCs; Harmonic analysis; harmonic oscillatory instabilities; Matemàtiques i estadística; negative‐sequence VSC conductances; Offshore installations; poorly damped harmonic resonances; positive‐ sequence VSC conductances; Power convertors; Power grids; Power system stability; Research Article; system instability; system stability; Time-domain analysis; traction system; voltage‐source converters; VSC admittance; VSC damping; VSC parameters; Wind power; Wind power plants; Àrees temàtiques de la UPC; system stability; power system stability; traction system; power convertors; grid-connected VSCs; admittance study; harmonic oscillatory instabilities; time-domain analysis; voltage-source converters; damping; system instability; offshore installations; VSC parameters; appropriate VSC parameter values; VSC damping; positive- sequence VSC conductances; negative-sequence VSC conductances; VSC admittance; poorly damped harmonic resonances; power grids; wind power plants; grid-connected VSC systems
• ISSN: 1751-8687; 1751-8695; 1751-8695
• DOI: 10.1049/iet-gtd.2019.0321

Voltage source converters (VSCs) can reduce damping of grid-connected VSC systems at harmonic resonances, leading to system instability. The conductance of the VSC admittance can be shaped selecting appropriate VSC parameter values to increase VSC damping at poorly damped harmonic resonances and ensure system stability. This study extends existing findings and makes contributions in this direction. Analytical expressions of the positive- and negative-sequence VSC conductances are presented to study exhaustively the impact of VSC parameters on harmonic oscillatory instabilities. Two applications, i.e. a traction system and an offshore wind power plant, are used to show the contribution of this study. The analytical study is validated from PSCAD/EMTDC time-domain simulations.