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Three-level three-phase four-leg inverting system, control method thereof and controller

A technology of three-phase four-leg and inverter system, which is applied in the direction of electrical components, AC power input conversion to DC power output, and output power conversion devices, which can solve the problems of high common-mode voltage and achieve enhanced adaptability and expansion The effect of application range

Active Publication Date: 2017-02-22
SUNGROW POWER SUPPLY CO LTD
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Problems solved by technology

[0005] The present invention provides a three-level three-phase four-leg inverter system and its control method and controller to solve the problem of high common-mode voltage caused by high DC side voltage in the prior art

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  • Three-level three-phase four-leg inverting system, control method thereof and controller
  • Three-level three-phase four-leg inverting system, control method thereof and controller
  • Three-level three-phase four-leg inverting system, control method thereof and controller

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Embodiment Construction

[0045] 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.

[0046] The invention provides a control method for a three-level three-phase four-leg inverter system to solve the problem in the prior art that high DC side voltage will lead to high common-mode voltage.

[0047] Specifically, the control method of the three-level three-phase four-leg inverter system is applied to the controller of the three-level three-phase four-leg inverter system; for example figure 1 As shown, the three-level three-phase four-leg inverter system includes: an inverter circuit 101, an AC filter 102 and a controller; wherein, the inverter circuit 101 includes four bridge arms, and the first bridge arm includes four Switch tube T 11 , T 12 , T 13 and T 14 , the second bridge arm includes four switching tubes T 2...

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Abstract

The invention provides a three-level three-phase four-leg inverting system, a control method of the three-level three-phase four-leg inverting system and a controller. The method comprises steps of judging if direct current side voltage of the three-level three-phase four-leg inverting system is lift up to be more than a preset high limit value through a controller; when the direct current side voltage is lift up to be more than a preset high limit value, controlling two middle switch tubes to open normally and upper and lower switch tubes close normally of a fourth arm of the three-level three-phase four-leg inverting system, so that the three-level three-phase four-leg inverting system is converted to be a three-phase four-wire system, a point in an alternating current filter of the system can be returned, and the output common mode voltage is controlled; when the direct current side voltage is high, the common mode voltage of the system is inhibited, thus the three-level three-phase four-leg inverting system maintains the function of carrying imbalance load; meanwhile, the adaptation is enhanced, and the application scale of the three-level three-phase four-leg inverting system is enlarged.

Description

technical field [0001] The invention relates to the technical field of three-phase four-bridge inverter control, in particular to a three-level three-phase four-bridge inverter system, a control method and a controller thereof. Background technique [0002] The three-level three-phase four-leg inverter system will be an application trend in the field of optical storage due to its ability to carry 100% unbalanced loads. When the three-level three-phase four-leg inverter system is applied in the photovoltaic field, its DC side voltage will change with the output power, ambient temperature, light intensity and other factors; and when the three-level three-phase four-leg inverter system When the inverter system is applied in the field of energy storage, since the output voltage of the energy storage device (battery) is also related to the depth of discharge / charge, in the field of energy storage, the DC of the three-level three-phase four-leg inverter system The side voltage al...

Claims

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Application Information

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IPC IPC(8): H02M7/483
CPCH02M7/483
Inventor 王艾邹海晏江涛叶亮陶磊
Owner SUNGROW POWER SUPPLY CO LTD
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