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Large-capacity inversion grid-connected device

A large-capacity, inverter technology, applied in the direction of irreversible DC power input conversion to AC power output, single-network parallel feeding arrangement, conversion equipment that can be converted to DC without intermediate conversion, etc., can solve the problem of high production cost High and low production efficiency, etc., to achieve the effect of simple and reasonable process structure, low cost, and reduced production cost

Inactive Publication Date: 2012-10-03
XINFENGGUANG ELECTRONICS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] How to design an inverter grid-connected circuit with relatively low requirements for process structure parameters and low cost components is the key to solving the high production cost and low production efficiency of inverter grid-connected devices in existing high-power applications

Method used

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0029] Such as figure 1 As shown, the system circuit block diagram of the inverter grid-connected device of the present invention is given, the input terminals of power module unit 1, power module unit 2, ..., power module unit n are respectively connected to the V+ and V- terminals of direct current, In this way, each power module unit is connected in parallel. The output terminals V111, V112, V121, V122, V122, V131, V132, ... ... VN32 of the power module unit are respectively connected to the secondary windings V111, V112, V121, V122, V122, V131, V132, ... ... VN32 of the isolation transformer , and then form the total output through the three-phase windings A, B, and C on the primary side of the transformer, and then connect it to the grid. By increasing or decreasing the number of power module units, grid-connection of DC power with different capa...

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Abstract

The invention relates to a large-capacity inversion grid-connected device which is characterized by comprising an isolation transformer and power module units, wherein n three-phase windings or 3n single-phase windings are arranged on the secondary side of the transformer. When the 3n single-phase windings are arranged on the secondary side of the transformer, the number of the power module units is n and the power module units are formed by three single-phase controllable full-wave rectification H bridges, or the number of the power module units is 3n and the power module units are formed by one single-phase controllable full-wave rectification H bridge. When the n three-phase windings are arranged on the secondary side of the transformer, the number of the power module units is n and the power module units are formed by a circuit with three-phase output and formed by three controllable full-wave rectification bridge arms. The large-capacity inversion grid-connected device effectively achieves that large-capacity direct current is inverted and then connected into a power grid, achieves inversion and grid-connection of direct current with different capacities by increasing and decreasing the number of the power module units, has the advantages of being compact and reasonable in process structure, low in cost and high in efficiency, meets market requirements and is convenient to popularize and apply.

Description

technical field [0001] The present invention relates to a large-capacity inverter grid-connected device, more specifically, to a large-capacity inverter grid-connected device that uses semi-controlled power semiconductor switching devices in parallel through power module units. Background technique [0002] With the development of modern inverter technology, new technology has been widely used in industrial equipment. The inverter technology has the advantages of excellent energy saving effect, convenient operation, easy installation and maintenance, etc., but due to the large difference in working conditions, some such as Wind power plants, photovoltaic power plants, and rail transit subway stations require all regenerative energy to be fed into the grid, especially for special cases with relatively large capacity. There is a certain degree of difficulty. The existing inverter grid-connected devices have very strict requirements on the process structure parameters of the e...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02M7/48H02M5/10
Inventor 尹彭飞陈敏杜秀虹张天宝李瑞来
Owner XINFENGGUANG ELECTRONICS TECH CO LTD
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