Three-level inverter model predictive power control method based on two-vector synthesis

A three-level inverter, power control technology, applied in output power conversion devices, AC power input into DC power output, electrical components, etc. , wide harmonic spectrum and other problems, to achieve the effect of reducing switching times, reducing harmonic content, and saving computing resources

Active Publication Date: 2018-09-28
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

These predictive control algorithms can balance the midpoint voltage of the three-level inverter, but the switching frequency of these two traditional methods is changing, and only one optimal voltage vector is selected as the voltage output in one switching cycle, and the switching state The change of the frequency is irregular, such an output has high requirements on the sampling frequency and the switching frequency is not fixed, and the harmonic spectrum is...

Method used

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  • Three-level inverter model predictive power control method based on two-vector synthesis
  • Three-level inverter model predictive power control method based on two-vector synthesis
  • Three-level inverter model predictive power control method based on two-vector synthesis

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Embodiment 1

[0047] exist figure 1 In , the circuit diagram of the three-level grid-connected inverter is given. The three-level three-phase inverter is connected to the grid through the filter inductor L and the equivalent resistance R.

[0048] exist figure 2 In , the space voltage vectors corresponding to 27 switch states are given, and each switch state corresponds to the voltage vector output by the corresponding inverter.

[0049] When the inverter switch state is v i When , the voltage vector output by the three-level inverter is u i (u αi , u βi ), the output voltage vector u of the three-level inverter i It can be obtained from the grid line voltage vector e, line current vector i, inductance L and resistance R:

[0050]

[0051] In formula (1), by ignoring the resistance of the filter, the equation can be transformed into the two-phase stationary coordinate system αβ after Clark transformation:

[0052]

[0053] Among them, (e α ,e β ) and (i α ,i β ) represents...

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Abstract

The invention discloses a three-level inverter model predictive power control method based on two-vector synthesis. The instantaneous active and reactive power of a grid-connected inverter is adjustedvia the model predictive power control based on two-vector synthesis, and a neutral-point voltage is balanced; the three-level inverter model predictive power control method based on two-vector synthesis is divided into two steps as follows: establishing two cost functions, firstly figuring out a small sector where an ideal voltage vector is located, then selecting two vectors through a reasonable cost function, and adjusting the duty ratio thereof to control switching elements of a three-level inverter. By adoption of the method, the switching frequency can be fixed, the calculation amount of the algorithm can be reduced, the computational resources can be saved, and the steady state and dynamic performance of the inverter controlled by the method are good.

Description

technical field [0001] The invention relates to the technical field of three-level inverter control, in particular to a three-level inverter model predictive power control method based on two-vector synthesis. Background technique [0002] With the increasingly severe environmental pollution and energy crisis, the distributed power generation technology using renewable energy such as solar energy and wind energy has received more and more attention. The inverter is the interface between the distributed generation system and the grid. Compared with the traditional two-level inverter, the three-level inverter has low harmonic content, small switching loss, and much higher power quality and efficiency. [0003] Model predictive control is a new type of predictive control strategy. This strategy needs to establish a system model that can predict future behavior. Usually, a cost function is constructed, and the optimal switch state that makes the cost function reach the minimum v...

Claims

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Application Information

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IPC IPC(8): H02M7/483
Inventor 康龙云程建材胡毕华肖文哲
Owner SOUTH CHINA UNIV OF TECH
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