Prediction control method of constant switch frequency model of tri-level grid connected inverter

A technology of model predictive control and constant switching frequency, applied in the direction of converting AC power input to DC power output, electrical components, circuit devices, etc. The effect of reducing the ripple of active power and reactive power, and reducing the amount of calculation

Inactive Publication Date: 2017-07-21
SOUTH CHINA UNIV OF TECH
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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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  • Prediction control method of constant switch frequency model of tri-level grid connected inverter
  • Prediction control method of constant switch frequency model of tri-level grid connected inverter
  • Prediction control method of constant switch frequency model of tri-level grid connected inverter

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Embodiment Construction

[0056] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings and examples.

[0057] 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.

[0058] Three-level grid-connected inverter constant switching frequency model predictive cont...

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Abstract

The invention discloses a prediction control method of a constant switch frequency model of a tri-level grid connected inverter. The method comprises following steps of firstly, adopting tri-vector synthesis in a tri-level space vector modulation method, and determining a target function according to a transient power theory and a direct power prediction control method; step 2, according to the target function, taking the smallest value to determine a small section position where a reference vector is located; step 3, calculating respective action time of three vectors in one switch period; and step 4, according to central point voltage balance, determining a switch sequence. According to the invention, calculated amount of power control of the tri-level grid connected inverter can be greatly reduced; ripple waves of active power and reactive power of the grid connected inverter are reduced; better dynamic and static performance is achieved; constant switch frequency can be achieved; and good harmonic wave inhibition effects are achieved.

Description

technical field [0001] The invention relates to the field of three-level grid-connected inverters, in particular to a model predictive control method for constant switching frequency of 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 gen...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02M7/5395H02J3/38
CPCH02J3/38H02M7/53875H02M7/5395H02J2203/20H02M7/53876
Inventor 康龙云冯腾胡毕华冯元彬王则沣
Owner SOUTH CHINA UNIV OF TECH
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