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Photovoltaic (PV) microinverters have grown rapidly in the small-scale PV market, where typical two-stage converters are used to connect one PV module to the single-phase AC grid. This configuration achieves better performance in terms of energy yield compared with other PV configurations. However, the conversion efficiency of a two-stage system is...
Contexts in source publication
Context 1
... DBI is composed by two DC-DC bidirectional boost converters, sharing the input source (PV panel), as illustrated in Figure 3. Note that both boost converters operate in a non-conventional manner; indeed, each boost generates a low-frequency (60 Hz) AC output voltage with a DC-bias. ...
Context 2
... the implementation of the global switching strategy for the whole inverter shown in Figure 3, the power devices S 1 and S 4 are controlled with the same gating signal u(t), while the other diagonal power devices (S 2 and S 3 ) are controlled with the complementary gating signal 1 − u(t), then defining the global operation of the system. The averaged model of the DBI is in this case described by ...
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Citations
... Additionally, the boost inverter requires a trajectory tracking control which is more complex than the regulation-oriented control. These challenges require the use of advanced control techniques to achieve reliable and robust performance [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. One of the more interesting challenges in the boost converter is its control; it is a nonminimum phase system, which means that its linearized model has a right-half plane zero in the transfer function. ...
... Additionally, the boost inverter requires a trajectory tracking control which is more complex than the regulation-oriented control. These challenges require the use of advanced control techniques to achieve reliable and robust performance [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. ...
The boost converter is mostly used as a DC–DC converter, but two boost converter power stages can be configured to perform the DC–AC conversion. In this case, the control system of the power stage must be designed for trajectory tracking (instead of regulation), which brings interesting challenges. This work deals with the design of a higher-order sliding mode output regulator for a DC-biased sinusoidal power conversion problem on a single boost converter stage of a boost inverter for asymptotic trajectory tracking of the voltage capacitor. The steady-state reference signal for the inductor current is proposed as an approximated solution of the well-known Francis–Isidori–Byrnes equations. The used approach is the direct control of the output, where the nonminimum phase variable, i.e., an adequate sliding function, stabilizes the current through the inductor. Lastly, by means of real-time experimentation, the good performance of the proposed control strategy is verified.
... Climate-change-related problems have focused the attention on renewable energy sources as an option to fossil fuels for electric energy generation [1][2][3][4][5][6][7][8]. Photovoltaic (PV) panels and fuel cells (FC) stacks are among the most studied renewable energy sources, but they produce electrical energy at a relatively low voltage; their voltage levels need to be boosted before being injected into the utility grid. ...
The increasing interest in renewable energy sources has brought attention to large voltage-gain dc–dc converters; among the different available solutions to perform a large voltage-gain conversion, this article presents an overview of non-isolated dc–dc converter topologies that utilize switched-capacitor circuits, i.e., diode-capacitors voltage multipliers. The review includes combinations of a traditional power stage with a diode-capacitor-based voltage multiplier, such as the multilevel boost converter. This article starts by reviewing switched-capacitor (SC) circuits, different topologies, and different types of charge exchange; it provides a straightforward analysis to understand the discharging losses. It then covers the multilevel boost converter and other topologies recently introduced to the state-of-the-art. Special attention is put on SC circuits with resonant charge interchange that have recently been probed to achieve very good efficiency. An additional contribution of the article is new proof of the discharging losses in resonant switched-capacitor circuits focused on the initial and final stored energy in capacitors, and this proof explains the relatively large efficiency obtained with SC resonant converters.
