Impact of inertia & effective short circuit ratio on control of frequency in weak grids interfacing LCC-HVDC & DFIG-based wind farms

Amirthagunaraj Yogarathinam, Jagdeep Kaur, Nilanjan Ray Chaudhuri

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

Although virtually every overhead HVdc line is based on line commutated converter (LCC) technology, hardly any work has been reported on modeling and analysis of the impact of inertia and effective short circuit ratio on control of frequency in weak grids interfacing LCC-HVdc and onshore doubly fed induction generator (DFIG)-based wind farms. This paper develops a comprehensive modeling and stability analysis framework of a weak grid that interfaces an LCC-HVdc station and a DFIG-based wind farm. To that end, a nonlinear averaged phasormodel of the system is derived, which is then benchmarked against a detailed switched model. The averaged model is linearized to design a frequency controller for the LCC-HVdc rectifier station. Participation factor and eigenvalue sensitivity measures indicate that the ac system electromechanical mode and the "HVdc PLL" mode are highly sensitive to changes in effective dc inertia constant and effective short circuit ratio, respectively. Root-locus analysis in a progressively weak grid validates these results. A systematic design process of the frequency controller parameters reveals a negative interaction between the "generator speed-HVdc PLL-frequency controller" mode and the "DFIG-GSC controller" mode.

Original languageEnglish (US)
Article number7563401
Pages (from-to)2040-2051
Number of pages12
JournalIEEE Transactions on Power Delivery
Volume32
Issue number4
DOIs
StatePublished - Aug 2017

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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