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access icon free Multi-agent based intelligent frequency control in multi-terminal dc grid-based hybrid ac/dc networks

© The Institution of Engineering and Technology
Received 01/12/2017, Accepted 31/05/2018, Revised 17/04/2018, Published 16/07/2018

This study proposes a novel control scheme for frequency support in multi-terminal dc grid-based hybrid ac/dc networks. This control is based on the multi-agent system paradigm with an adaptive frequency droop control and is distributed in all grid-tied converters. The objective of this control is to enable the ac grids to intelligently decide on their participation on frequency support, considering their power reserves, demand, and relevant technical constraints and requirements. The main achievement of the proposed control is to minimise the rate of change of frequency and frequency undershoot (), and also providing a systematic enhancement in frequency stability, particularly in the disturbed and weak ac grids. A stability analysis is performed for the proposed control, using vector Lyapunov method for interconnected systems, deriving the conditions for stable operation. Test scenarios are conducted on a modified seven-terminal CIGRE grid, connecting five ac grids. Results under different scenarios show the performance and robustness of the proposed control in providing significant enhancement in the frequency regulation for the connected ac grids.

Inspec keywords: power system stability; frequency control; power system interconnection; intelligent control; multi-agent systems; power grids; Lyapunov methods; adaptive control; AC-DC power convertors; power system control

Other keywords: interconnected systems; multiagent system paradigm; multiterminal dc grid-based hybrid AC-DC networks; vector Lyapunov method; frequency support; power reserves; technical constraints; frequency stability; weak ac grids; grid-tied converters; stability analysis; multiagent based intelligent frequency control; test scenarios; connected ac grids; disturbed ac grids; modified seven-terminal CIGRE grid; adaptive frequency droop control; frequency undershoot; frequency regulation; novel control scheme

Subjects: Power system control; Stability in control theory; AC-DC power convertors (rectifiers); Frequency control; Control of electric power systems; Multivariable control systems; Power system management, operation and economics; Self-adjusting control systems

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