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access icon free Asymptotically stable controller for SSTs based on Lyapunov direct stability method

© The Institution of Engineering and Technology
Received 28/04/2017, Accepted 13/09/2017, Revised 22/08/2017, Published 15/09/2017

An asymptotically stable controller for solid-state transformers (SSTs) based on Lyapunov direct stability (LDS) method is presented in this study. The proposed controller has four control objectives for the SST application, which includes unity power factor at medium-voltage AC (VAC) side of the SST, constant DC-link voltage and constant output voltage magnitude and frequency at low-VAC side of the SST. To fulfil the above-mentioned objectives four control laws are derived from the Lyapunov function, directly. The proposed LDS-based controller is simulated using MATLAB/Simulink software. The obtained results indicate the fast and superior dynamic characteristics of the proposed controller. The LDS-based controller is comprehensive and can be adopted for the SST applications.

Inspec keywords: Lyapunov methods; frequency control; voltage control; power transformers; power control; stability

Other keywords: unity power factor; constant DC-link voltage; LDS method; control laws; Lyapunov direct stability method; solid-state transformers; asymptotically-stable controller; medium-voltage AC side; dynamic characteristics; constant output voltage magnitude; Lyapunov function; LDS-based controller; SST application; Matlab-Simulink software

Subjects: Frequency control; Power and energy control; Control of electric power systems; Transformers and reactors; Stability in control theory; Voltage control

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