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High-performance control system for grid-tied ESSs
Ist Teil von
IET generation, transmission & distribution, 2017-06, Vol.11 (8), p.2138-2145
Ort / Verlag
The Institution of Engineering and Technology
Erscheinungsjahr
2017
Link zum Volltext
Quelle
Wiley Online Library Journals
Beschreibungen/Notizen
In this study, a high-performance controller is proposed for single-phase grid-tied energy storage systems (ESSs). To control power factor and current harmonics and manage time-shifting of energy, the ESS is required to have low steady-state error and fast transient response. It is well known that fast controllers often lack the required steady-state accuracy and trade-off is inevitable. A hybrid control system is therefore presented that combines a simple yet fast proportional derivative controller with a repetitive controller which is a type of learning controller with small steady-state error, suitable for applications with periodic grid current harmonic waveforms. This results in an improved system with distortion-free, high power factor grid current. The proposed controller model is developed and design parameters are presented. The stability analysis for the proposed system is provided and the theoretical analysis is verified through stability, transient and steady-state simulations.