Mixed cascading type multilevel stored energy charging-discharging and voltage-equalizing circuit
A hybrid cascading and voltage-equalizing circuit technology, which is applied to systems that store electrical energy, electrical components, and conversion equipment that can be converted to DC without intermediate conversion. It can reduce the direct series-parallel, small jump and harmonic, and improve the system performance.
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[0020] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0021] Such as figure 1 As shown, the present invention includes a multilevel converter 1, an inductor 2, a voltage and current detection unit 3 and a controller 4, wherein the multilevel converter 1 includes a three-phase circuit, and each phase circuit includes several stages connected in series Cascade unit 5, two connection terminals X for each cascade unit 5 1 、X 2 Respectively with the connection terminal X of the adjacent cascade unit 5 2 , the connection terminal X of the adjacent cascade unit 5 1 in series. The three-phase output terminal of the multilevel converter 1 is connected to the three-phase loads a, b and c to realize the discharge function, that is, supply power to the load; the three-phase input terminal U of the multilevel converter 1 sa , U sb and U sc They are respectively connected to an external grid through an inductor...
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