Abstract This paper provides a comparative analysis of two classical control strategies applied to a grid-connected voltage-source converter (VSC) with an L-type filter. The first method employs a cascade control structure with proportional–integral controllers, while the second uses a full-state feedback controller designed via the linear quadratic regulator method. A linearised state-space model of the converter, including controller and modulation delays, is developed and consistently used for both control schemes to enable a fair comparison. The control approaches are evaluated through detailed numerical simulations under identical operating conditions, including grid voltage disturbances, load changes and reference variations. Performance is assessed based on transient response, disturbance rejection, control effort, robustness to parameter changes and stability margins. Disk margin (DM) analysis offers a conservative, comprehensive evaluation of closed-loop stability. The results show that, although both strategies attain similar settling times, the full-state feedback controller offers superior disturbance rejection, reduced peak currents and notably larger stability margins. The paper aims to provide practical insights and guidelines for selecting suitable control strategies for power electronic systems.
Marek Michalczuk (Thu,) studied this question.
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