Direct power prediction control method of three-level grid-connected inverter model

A technology for power control and model prediction, which is applied in output power conversion devices, conversion of AC power input to DC power output, electrical components, etc.

Inactive Publication Date: 2017-08-29
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the traditional direct power control method has the problem that the switching frequency changes with the sampling time, load parameters and system state, resulting in scattered harmonic components, and the prediction algorithm is computationally intensive and takes up a lot of chip resources

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  • Direct power prediction control method of three-level grid-connected inverter model
  • Direct power prediction control method of three-level grid-connected inverter model
  • Direct power prediction control method of three-level grid-connected inverter model

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Embodiment Construction

[0077] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings and examples.

[0078] figure 1 The structure diagram of the T-type three-level inverter is given, including three bridge arms connected in parallel, each phase bridge arm includes two series-connected IGBT switch tubes, and two IGBT switches in different directions are connected in series on one side of the midpoint of each phase bridge arm. The other side of the IGBT tube is connected to the power grid; the same DC voltage source is connected to each bridge arm end in parallel; the midpoint of the two midpoint clamping capacitors connected in parallel to the input voltage source is connected to the two directions of each phase bridge arm in different directions One end of the IGBT tube; each IGBT tube is driven by the control circuit.

[0079] The three-level grid-connected inverter model predicts the direct power control method...

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Abstract

The invention discloses a direct power prediction control method of a three-level grid-connected inverter model. The method comprises the following steps that 1) synthesis of three vectors is used in a three-level spatial vector modulation method, and an objective function is determined according to an instantaneous power theory and a direct power prediction control method; 2) a virtual vector is constructed, a large sector position where the virtual vector is positioned is determined, and a value of the virtual vector is calculated; 3) a small sector position where the virtual vector is positioned is determined; 4) action time of each of three vectors in the next switching period is calculated; and 5) and a switching sequence is determined according to balance of a mid-point voltage. The method is low in computational complexity, ripples of active and reactive power of the grid-connected inverter are low, the dynamic and static performances are high, and a harmonic wave inhibition effect is good.

Description

technical field [0001] The invention relates to the field of three-level grid-connected inverters, in particular to a model-predicted direct power control method for a three-level grid-connected inverter. Background technique [0002] With the rapid development of distributed power, energy storage systems, electric vehicles and other fields, the requirements for power quality and system efficiency are also getting higher and higher. Compared with the traditional two-level inverter, the three-level inverter has the advantages of less harmonics, less voltage stress of the switching tube, high withstand voltage, and less electromagnetic interference. Compared with other three-level neutral-point clamped inverters, the T-type inverter has two main advantages: when the output phase voltage is DC bus voltage and zero, only one switch is turned on, reducing the Turn-on loss; the average current flowing through each switch tube is equal, and each switch tube generates the same heat...

Claims

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Application Information

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IPC IPC(8): H02M7/487H02M7/5387H02M1/12H02J3/38
CPCH02J3/38H02J2203/20H02M1/12H02M7/487H02M7/5387
Inventor 康龙云冯腾胡毕华王则沣冯元彬
Owner SOUTH CHINA UNIV OF TECH
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