A control method and system for a T-type three-level single-phase grid-connected inverter

A control method and inverter technology, applied in the direction of single-network parallel feeding arrangement, etc., can solve the problems of complex control process and poor flexibility

Active Publication Date: 2017-08-25
SUZHOU UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

However, these control methods all involve PWM (Pulse Width Modulation, pulse width modulation) control and current closed inner loop, resulting in a relatively complicated control process and poor flexibility.

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  • A control method and system for a T-type three-level single-phase grid-connected inverter
  • A control method and system for a T-type three-level single-phase grid-connected inverter
  • A control method and system for a T-type three-level single-phase grid-connected inverter

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Embodiment Construction

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0046] The embodiment of the present invention discloses a control method of a T-type three-level single-phase grid-connected inverter, which is applied to a T-type three-level single-phase grid-connected inverter. figure 1 It is a schematic diagram of the topological structure of a T-type three-level single-phase grid-connected inverter. The T-type three-level single-phase grid-connected inverter includes a power switch tube set, and the power switch tube set ...

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Abstract

The invention discloses a method and a system for controlling a T-type three-level single-phase grid-connected inverter. The method comprises the following steps: acquiring the grid voltage, the output current of an inverter and the direct-current bus voltage at the current moment; calculating the reference output voltage of the inverter at the current moment; and calculating the function value of a default control objective function in each switching state, taking the minimum objective function value among the obtained nine objective function values as the optimal objective function value, and determining the optimal direct-current bus voltage at next moment according to the optimal objective function value. According to the invention, on the basis of contracting the default control objective function, predictive control on the direct-current bus voltage at next moment is realized through finite switching state models. Therefore, inverter active power, reactive power and neutral point voltage balance control can be realized without complex PWM control or current inner-loop closing, and the T-type tri-level single-phase grid-connected inverter control process is simplified.

Description

technical field [0001] The invention relates to the technical field of grid-connected inverter control, in particular to a control method and system for a T-type three-level single-phase grid-connected inverter. Background technique [0002] In recent years, with the increase of energy consumption and the depletion of conventional energy sources, renewable energy sources such as solar energy and wind energy have developed rapidly. The grid-connected inverter is the bridge connecting the distributed generation system and the grid, and is the core of the distributed generation system. Among them, the T-type three-level single-phase grid-connected inverter is an important grid-connected inverter, which has the advantages of fewer power switch tubes and high inverter efficiency. [0003] In the prior art, the T-type three-level single-phase grid-connected inverter is mainly controlled by control methods such as the PI control method in the dq rotating coordinate system or the q...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
Inventor 杨勇樊明迪何立群谢门喜朱忠奎
Owner SUZHOU UNIV
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