Abstract
Power electronicconverters have attracted significant attention in renewable energy generation and distribution systems. However, some crucial techniques, such as power quality and stability enhancement of converters, still need to be further improved. In this study, an improved reduced-order generalised integrator (ROGI), which can achieve decoupling, is proposed. It can reduce the α -axis and β -axis current coupling and improve the dynamic response performance, maintaining the advantage of the conventional ROGI (e.g. less computational burden). Besides, delay compensation is added to the proposed decoupled ROGI, which improves the stability of the current loop and can be effectively applied for the current/voltage harmonic suppression in the distributed system. Also, the procedures of parameter tuning and optimal delay compensation angle computation are given. Finally, the harmonic current compensation of the three-phase grid-connected converter is taken as an example for simulation analysis, and the experimental results verify the reasonability and effectiveness of the proposed method.
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