DQ rotating coordinate system decoupling method applied to grid-connected inverter control

A technology of rotating coordinate system and inverter, applied in irreversible DC power input into AC power output, output power conversion device, AC power input into DC power output and other directions, can solve poor performance, decoupling problems such as low accuracy, to achieve the effect of improving accuracy and decoupling performance

Inactive Publication Date: 2021-04-20
SINENG ELECTRIC CO LTD
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Problems solved by technology

[0004] The embodiment of the present invention provides a DQ rotating coordinate system decoupling method applied to grid-connected inverter control, aiming to solve the problems of low decoupling accuracy and poor performance in existing inverter decoupling methods

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  • DQ rotating coordinate system decoupling method applied to grid-connected inverter control
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  • DQ rotating coordinate system decoupling method applied to grid-connected inverter control

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Embodiment Construction

[0034] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0035] The present invention performs feedforward by detecting the inductance voltage and realizes decoupling between DQs based on the inductance voltage, which can avoid the influence of electrical parameter changes on the control performance, and further effectively avoid the influence of inductance value changes on the decoupling. Improve the accuracy of DQ decoupling and decoupling performance.

[0036] Such as figure 1 as shown, figure 1 It is a flow chart of a DQ rotating coordinate system decoupling method applied to grid-connected inverter control provided by an embodiment of the present ...

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Abstract

The invention is suitable for the technical field of three-phase grid-connected inverter decoupling, and provides a DQ rotating coordinate system decoupling method applied to grid-connected inverter control. The optical storage microgrid system of DC networking comprises the following steps: obtaining the inductive voltage and inductive current of a grid-connected inverter; establishing an initial voltage matrix of the inductance voltage according to the inductance voltage and the inductance current; performing DQ rotating coordinate system transformation on the initial voltage matrix to obtain a corresponding target voltage matrix; obtaining a corresponding coupling quantity according to the target voltage matrix; and decoupling the DQ according to the coupling quantity. Feed forward is carried out by detecting the inductance voltage, decoupling between DQs is achieved based on the inductance voltage, the influence of electrical parameter changes on the control performance can be avoided, and then the influence of inductance value changes on decoupling is effectively avoided. And the DQ decoupling accuracy and the decoupling performance are improved.

Description

technical field [0001] The invention belongs to the technical field of decoupling of three-phase grid-connected inverters, and in particular relates to a DQ rotating coordinate system decoupling method applied to the control of grid-connected inverters. Background technique [0002] The control of the three-phase grid-connected inverter generally involves DQ conversion. In the result expression of the transformation from ABC coordinate system to DQ rotating coordinate system, there is electrical quantity coupling between DQ. These couplings have a more obvious impact on the control performance, and ultimately affect the performance of the equipment. In order to achieve better control performance, DQ is generally decoupled. When decoupling the inductor current DQ coupling, the coupling value is calculated according to the inductor current, inductance value, and frequency, and then acts on the control feedforward. [0003] However, the inductance value in power electronic e...

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Application Information

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IPC IPC(8): H02M7/42H02M7/493
Inventor 马海红
Owner SINENG ELECTRIC CO LTD
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