Coordinated Control Robust Stability for VSC-HVDC Damping Controller Based on Effective Open-Loop Process Theorem

doi:10.3969/j.issn.1000－7229.2016.10.013

Abstract

Abstract: According to the phenomenon of low frequency oscillation in the AC-DC interconnected system with voltage source converter-high voltage direct current (VSC-HVDC）, this paper converts multi-variable system loop matrix equation into many single variable system loop equation, and establishes the independent mathematical models of each circuit, based on multi-variable system effective open-loop process (EOP) theorem. For the potential uncoordinated problem of each loop controller in multi-input multi-output (MIMO) nonlinear system which contains VSC-HVDC, this paper proposes a coordinated control robust stability index of each supplementary damping controller based on small gain theorem and EOP theorem. Then, the power system stabilizer (PSS) supplementary damping controller and VSC-HVDC supplementary damping controller in cooperative operation was designed to restrain low frequency oscillation. Finally, AC/DC four machine two-area system with a VSC-HVDC in PSCAD /EMTDC has been established, and the validity of the proposed indicators and the feasibility of the designed controller have been verified through simulation.

Key words: VSC-HVDC, effective open-loop process, small gain theorem, supplementary damping controller, low frequency oscillation

CLC Number:

TM 72

LI Zhihan, ZHANG Yingmin, LI Xingyuan, DENG Qi. Coordinated Control Robust Stability for VSC-HVDC Damping Controller Based on Effective Open-Loop Process Theorem[J]. Electric Power Construction, 2016, 37(10): 93-.

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