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Three-phase four-bridge-arm inversion system

A three-phase four-arm, inverter system technology, applied in the direction of converting AC power input to DC power output, photovoltaic power generation, AC network circuits, etc., can solve problems such as large losses, and achieve the effect of avoiding control and loss

Active Publication Date: 2017-03-15
SUNGROW POWER SUPPLY CO LTD
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Problems solved by technology

[0005] The present invention provides a three-phase four-leg inverter system to solve the problem of large loss in the prior art with a load operating in a balanced mode

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  • Three-phase four-bridge-arm inversion system
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  • Three-phase four-bridge-arm inversion system

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Embodiment Construction

[0038] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0039] The invention provides a three-phase four-leg inverter system to solve the problem of large loss in the prior art with a load operating in a balanced mode.

[0040] Specifically, for the three-phase four-arm inverter system, see figure 1 , including: an inverter unit 101, a filter unit 102 and a control unit; wherein:

[0041] The output end of the inverter unit 101 is connected to the input end of the filter unit 102;

[0042] The output end of the filter unit 102 is connected to a three-phase four-wire system load or a power grid;

[0043] The output terminal of the control unit is connected with the control terminal of the inverter unit 101 .

[0044] The specific working principle is:

[0045] Both the load and the power...

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Abstract

The invention provides a three-phase four-bridge-arm inversion system. When a load of the three-phase four-bridge-arm inversion system operates in an unbalanced mode or when a grid-connected current operates in an unbalanced mode, a control unit controls all switching tubes of four bridge arms in an inversion unit to work based on a pulse width modulation strategy; and when the load of the three-phase four-bridge-arm inversion system operates in a balanced mode or when the grid-connected current operates in a balanced mode, the control unit controls all switching tubes of the fourth bridge arm in the inversion unit to stop working, thereby further avoiding control and loss on the fourth bridge arm by the system.

Description

technical field [0001] The invention relates to the technical field of three-phase four-bridge inverters, in particular to a three-phase four-bridge inverter system. Background technique [0002] In recent years, with the development and maturity of the modulation strategy of the three-phase four-leg inverter system, the application of the three-phase four-leg inverter system has gradually become more and more widespread in the occasions such as micro-grid systems that may have loads operating in unbalanced mode. . The current application of the three-phase four-leg inverter system is mainly based on different control methods of this topology to realize the control of balance and unbalance, output performance, and voltage utilization. [0003] However, the current scheme is controlled in the form of a three-phase four-leg topology in any case, which will inevitably lead to an increase in the control complexity when the system is loaded in a balanced mode, and the control ef...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H02J3/38
CPCH02J3/383H02M7/5387Y02E10/56
Inventor 邹海晏王艾江涛陶磊叶亮
Owner SUNGROW POWER SUPPLY CO LTD
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