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Bidirectional inverter topology

A bidirectional inverter and topology technology, applied in the field of power conversion, can solve the problems of high price and complex structure, achieve the effects of low cost, realize power factor, and facilitate variable frequency drive and braking

Inactive Publication Date: 2014-06-25
FONRICH NEW ENERGY TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bi-directional converters are a relatively new demand, and the current products have disadvantages such as complex structure and high price, which require continuous technological advancement to meet industry needs

Method used

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Embodiment Construction

[0013] image 3 , Figure 4 It is a working schematic diagram of the bidirectional inverter topology using the present invention.

[0014] image 3 Shown is the working principle of the power flowing from the DC side to the AC side: at this time, the switch S5 is in the high-frequency chopper switch state; when S5 is in the on state, the energy storage inductor L1 is charged, and S7 and D7 are in the off state; when When S5 is in the off state, the current of the energy storage inductor L1 is freewheeling through D7 or S7; the H commutation bridge is in the power frequency switching state, commutating the current of L1 to realize the polarity change of the AC output; The diode freewheeling current can be adopted, that is, the freewheeling current flows through the diode D7, or the synchronous freewheeling method can be used, that is, the freewheeling current flows from the switch S7; in the diode freewheeling method, the freewheeling current does not need to be controlled, s...

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Abstract

The invention belongs to the field of power converter, and discloses a bidirectional inverter topology. Direct current and alternating current conversion is realized. The bidirectional inverter topology can be widely used in a system needing an alternating current and direct current hybrid power supply, an energy storage system and the like. According to the invention, a chopping switch, an energy storage inductor and an H type commutation rectification bridge are connected in series between positive and negative poles of a direct current end; a boost switch and the energy storage inductor which is connected in series are connected in parallel with the H type commutation bridge circuit; two bridge arm middle points of the H type commutation bridge are connected with an alternating current end; and by adopting a simple topology structure, direct bidirectional flow of direct current and alternating current is realized, and rectification, inversion, frequency conversion, reactive power control and the like are realized.

Description

technical field [0001] The invention belongs to the field of electric power conversion, realizes the mutual conversion of direct current and alternating current, and can be widely used in systems requiring alternating current and direct current hybrid power supply, energy storage, motor drive and braking. Background technique [0002] Bidirectional inverters, also known as inverter-rectifier integrated machines and battery inverters, are widely used in new energy energy storage systems, intelligent microgrid systems, new energy charging stations, and new energy power systems. Its function is to connect the AC system and the DC system to realize the energy conversion between the two systems, that is, sometimes it needs to be converted from DC to AC, and sometimes it needs to be converted from AC to DC. For the AC system, there are single-phase and three-phase points. The current high-power bidirectional converters, the high-power here mainly refers to more than 50KW, mainly ...

Claims

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Application Information

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IPC IPC(8): H02M7/72
Inventor 张永
Owner FONRICH NEW ENERGY TECH LTD
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