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Aalborg Inverter is a kind of high efficient Buck-Boost inverter. Since it may work in “Buck-Boost” mode, the control bandwidth should be high enough to ensure a good performance under any grid condition. However, during the “Boost” operation, the control bandwidth depends much on the grid impedance if the crossover frequency is traditionally chosen lower than the characteristic frequency of system...
This paper presents a new family of high efficiency dc/ac grid-tied inverter with a wide variation of input dc voltage. It is a “boost in boost, buck in buck” inverter, meaning that only one power stage works at high frequency in order to achieve minimum switching loss. The minimum voltage drop of the filtering inductor in the power loop is achieved to reduce the conduction power loss in both “boost”...
The Aalborg Inverter is a new type of high efficient DC/AC grid-tied inverter, where the input DC voltage can vary in a wide range. Compared with the LCL-filter, the LLCL-filter can save the total inductance for the conventional voltage source inverter. In this paper, an LLCL-filter based Aalborg Inverter is proposed and its character is illustrated through the small signal analysis in both “Buck”...
A traditional Voltage Source Inverter (VSI) has higher efficiency than a Current Voltage Source (CSI) due to the less conduction power loss. However, the reverse recovery of the free-wheeling diode limits the efficiency improvement for the silicon devices based hard-switching VSI. The traditional quasi-soft-switching inverter can alternate between VSI and CSI by using a proper control scheme and thereby...
In this paper, a new three-phase Quasi-Soft-Switching DC/AC inverter is proposed for reducing the switching losses and raising the reliability of the inverter. For the most of main switches of this inverter, soft switching condition is achieved by a simple auxiliary circuit consisted of a switch, a diode, and an inductor which is different from that of the traditional resonant soft-switching inverter...
In this paper, the efficiency of the conventional two-level and three-level grid-connected inverter for the photovoltaic (PV) generation is analyzed. And the DC-link voltagepsilas influence on it is also studied. It can be seen that when the inverter does not control the gridpsilas frequency and voltage, a conventional three-level inverter has higher efficiency than that of a conventional two-level...
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