Abstract
This paper presents the passivity-based controller design methodologies of the 3-phase modular multilevel cascaded converter (MMCC) as HVDC-PLUS for smart grid applications. The mathematical model of the MMCC is derived in the terms of energy dissipation mechanism among the converter cells. The solvability and passivity analysis are presented based on the state-space averaged (SSA) models. The energy shaping (ES) problem is formulated by properly selection of the energy function. And the dissipative characteristics of the MMCC-based HVDC-PLUS is revealed. The interconnection and damping assignment (IDA) technique is proposed to reshape the trajectory of the control objective to guarantee the global convergence and accurate reference tracking. The carrier phase-shifted PWM scheme is adopted to synthesize the control signals for the individual half-bridge converters. The various simulation results under reactive and active power transmission scenarios are presented, which confirms the effectiveness of the proposed passivity-based control methodologies
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