Stabilization of MT-HVDC grids via passivity-based control and convex optimization
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Date
2021-04-30
Authors
Montoya, Oscar Danilo
Gil-González, Walter
Garcés, Alejandro
Serra, Federico
Hernandez, Jesus C.
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Abstract
This paper presents a model for stabilizing multi-terminal high voltage direct-current (MT-HVDC) networks with constant power terminals (CPTs) interfaced with power electronic converters. A hierarchical structure of hierarchical control is developed, which guarantees a stable operation under load variations. This structure includes a port-Hamiltonian formulation representing the network dynamics and a passivity-based control (PBC) for the primary control. This control guarantees stability according to Lyapunov’s theory. Next, a convex optimal power flow formulation based on semidefinite programming (SDP) defines the control’s set point in the secondary/ tertiary control. The proposed stabilization scheme is general for both point-to-point HVDC systems and MTHVDC grids. Simulation results in MATLAB/Simulink demonstrate the stability of the primary control and the optimal performance of the secondary/tertiary control, considering three simulation scenarios on a reduced version of the CIGRE MT-HVDC test system: (i) variation of generation and load, (ii) short-circuit events with different fault resistances and (iii) grid topology variation. These simulations prove the applicability and efficiency of the proposed approach.
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Oscar Danilo Montoya, Walter Gil-González, Alejandro Garces, Federico Serra, Jesus C. Hernández,
Stabilization of MT-HVDC grids via passivity-based control and convex optimization, Electric Power Systems Research,
Volume 196, 2021, 107273, ISSN 0378-7796, https://doi.org/10.1016/j.epsr.2021.107273.