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Two model-based controllers for the quadratic boost converter with different number of sensors are presented and compared. The quadratic boost converter model is a bilinear control system whose linearization has complex right-half plane zeros. Common-use controllers consist in current and voltage control loops and rely on the requirement that the current dynamics is faster than the voltage dynamics...
This paper discusses the proposal of a single-phase inverter to deal with the leakage ground current problem in transformerless photovoltaic systems. The high efficiency and low cost allow non-isolated inverters to widespread their applications in the grid connected photovoltaic energy market. The removal of the low or high frequency transformer in a photovoltaic system let a ground path for the circulating...
This paper studies a modified DC-DC boost converter where the input inductance has been replaced by an LCL filter. The voltage conversion ratio of the proposed converter is equivalent to the conversion ratio of a conventional boost converter, and it has only one active switching device. A controller is proposed to regulate the output voltage to a given reference with guaranteed reduced input current...
This paper presents a comparison between two different passive filters for power converters tied to the grid with the application of active power injection. It addresses the L (inductive) filter and the LCL (inductive-capacitive-inductive) filter in single-phase power converters for which are presented the parameter design and modeling. These filters provide coupling of the power converter to the...
Single-phase transformerless photovoltaic (PV) inverters have become more widespread in the solar energy market. This is due to the higher efficiencies they achieve together with the very low ground currents, which are their main advantages. In this paper a multilevel transformerless single-phase topology, based on the H-bridge with an active clamping, is proposed. Multilevel output voltage is achieved...
This paper presents the modeling and control design of a single-phase full bridge neutral point clamped (FB-NPC) multilevel converter used in an active power filter (APF) application. The proposed topology is aimed to compensate reactive power and current harmonic distortion. Based on the system model, a multi-loop controller is proposed, which is aimed to accomplish three control objectives, namely,...
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