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Hybrid AC/DC microgrid can make full use of different kinds of renewable energy to meet the needs of various types of loads. The bidirectional converters become the link between dc and ac region. In this paper, H8 robust control method is proposed to stabilize the both-side voltages of the bidirectional converters where it is transformed to a mix sensitivity problem. When there are perturbations on...
This research addresses different characteristics of two Digital Phase-Locked Loop (DPLL) methods with fixed and variable sampling frequency for Active Power Filters (APFs). The mathematic models and design procedure for both DPLL strategies are presented in the paper. Both DPLL methods are based on dq transform phase detection and can be immune to the utility distorted and unbalance because of the...
Shunt Active Power Filters (SAPF) have been proved to be an effective approach to eliminate harmonic current in power grids. The DC voltage control during dynamic processes is critical for the safe and performance of the SAPF. In this paper, soft startup and impact suppression techniques are proposed to guarantee no voltage overshoots or sags in DC bus during startup and other dynamic processes. Subsequently,...
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