Coordinated damping control through multiple HVDC systems: A decentralized approach

Abstract

Abstract-Role of multiple HVDC links -both CSC and VSC -in improving the AC system dynamic performance is presented here. An Australian equivalent system with three critical interarea modes is considered to illustrate the case study on DIgSI-LENT PowerFactory. Subspace-based multi-input-multi-output (MIMO) system identification is used to estimate and validate linearized state-space models through pseudo random binary sequence (PRBS) probing in DIgSILENT PowerFactory. Choice of appropriate input-output combinations is done through modal residue analysis taking note of not only the magnitudes but also the phase angles. The decentralized control design is posed as an optimization problem and solved using an evolutionary technique. The results are validated through linear analysis and non linear simulation in DIgSILENT for two extreme (light and heavy loading) operating conditions.

Performance Analysis of Conjugate Gradient Algorithms Applied to the Neuro-Fuzzy Feedback Linearization-Based Adaptive Control Paradigm for Multiple HVDC Links in AC/DC Power System

“…The provision of appropriate supplementary damping control of the classical HVDC system provides modulation of power flow through the HVDC link and effectively mitigates inter-area oscillations of interconnected power systems [8]. Recently, extensive research has been carried out to propose Power Oscillation Damping (POD) controllers applying classical control theory, optimal control schemes, robust control methods and the feedback linearization technique [9][10][11][12][13][14][15][16]. Classical control theory-based POD controllers are designed with a first-order approximation of the system dynamics at a certain operating condition.…”

System stability improvement through optimal control allocation in voltage source converter-based high-voltage direct current links

“…N4SID is particularly useful tool for high-order multi-variable systems [23]. This technique has been shown to provide accurate linear models for the SE Australian test system [24]. VSC HVDC offers multiple control-loop options through modulation of active power (at the rectifier end) and reactive power (at both ends).…”