Input and output common-ground boost-buck photovoltaic grid-connected inverter and control method thereof
An input-output, buck-boost technology, applied in the direction of converting AC power input to DC power output, DC power input converting to DC power output, photovoltaic power generation, etc. Reliability and other issues, to achieve the effect of simple selection of circuit parameters, simple circuit structure, and wide application range
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[0030] The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings.
[0031] A photovoltaic grid-connected inverter with input and output shared ground and step-up and step-down of the present invention, such as figure 1 As shown, including five switching tubes, three diodes, two inductors and one capacitor, the fifth switching tube S 5 The collector of the DC bus is connected to the "+" terminal, and the fifth switching tube S 5 the emitter of the second diode VD 2 The cathode, DC inductance L dc One end of and the third switch tube S 3 The source of is connected to the node m; the first switch S 1 The source and the "-" terminal of the DC bus, the third diode VD 3 The anode, filter capacitor C 1 One end and grid u ab connected to terminal a, the first switching tube S 1 The drain and the DC inductance L dc the other end and the first diode VD 1 The anode of is connected to node n; the th...
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