A non-isolated grid-connected inverter with active power decoupling function
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A source power and inverter technology, applied in the field of non-isolated grid-connected inverters, can solve problems affecting large-capacity input filters, and achieve the effects of cost reduction, small size, and low cost
Active Publication Date: 2022-02-22
SHANGHAI MARITIME UNIVERSITY
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[0005] In view of this, the purpose of the present invention is to provide a non-isolated grid-connected inverter with active power decoupling function to solve the impact of the secondary pulsating power on the system and the large capacity of the current grid-connected inverter The use of input filters
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[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0028]The invention provides a non-isolated grid-connected inverter with an active power decoupling function to solve the current ripple caused by the secondary pulsating power and the use of a large-capacity input filter on the grid-connected side existing in the prior art .
[0029] see figure 1 and figure 2 , figure 1 The main circuit topology diagram provided for the embodiment of the present invention, figure 2 The schematic diagram of the detection...
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Abstract
The invention discloses a non-isolated grid-connected inverter with active power decoupling function, comprising: a first inductor, a second power switch, a first power switch, a first diode, a second diode, First decoupling capacitor, second inductor, fourth power switch, third power switch, third diode, fourth diode, second decoupling capacitor, first DC power supply, second DC power supply, filter Capacitor, third inductance, detection circuit, control circuit; the detection circuit is used to detect the first inductance current, the second inductance current, the AC voltage of the power grid, and the grid current, and feed back to the control circuit, and the control circuit will The feedback signal of the detection circuit is converted into a driving signal and sent to the first to fourth power switches. The non-isolated grid-connected inverter with active power decoupling function provided by the present invention has a simple structure, realizes the decoupling of ripple power, and avoids the use of a large-capacity input filter, and is small in size and low in cost. efficient.
Description
technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a non-isolated grid-connected inverter with an active power decoupling function. Background technique [0002] Grid-connected inverters are widely used in grid-connected systems to realize energy grid-connected. However, during power conversion, the secondary pulsating power on the grid-connected side causes low-frequency input current ripple, which not only affects the tracking of the maximum power point, but also reduces the life of components such as capacitors and batteries. Therefore, it is of practical significance to deal with the instantaneous power imbalance at the input and output terminals and eliminate the impact of the secondary pulsating power on the grid-connected system. [0003] On the other hand, in the topology of the voltage-current mixed-source grid-connected inverter disclosed in Chinese patent CN201310069154.1, it has the characterist...
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