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

A power control and inverter technology, which is applied to the output power conversion device, the conversion of AC power input to DC power output, electrical components, etc. The effect of wave content, improving performance, and reducing the amount of computation

Active Publication Date: 2017-09-05
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0004] In order to overcome the shortcomings of the existing grid-connected inverter control strategy, which has a large amount of calculation and the introduction of current noise into the reference voltage, resulting in the performance degradation of the inverter, the present invention provides a three-level grid-connected inverter dual-model predictive direct power control method, which can reduce the computational load of the algorithm, save computing resources, and reduce the delay time caused by the control algorithm

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Embodiment Construction

[0042] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0043] 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 resistor R.

[0044] exist figure 2 In , the space voltage vectors corresponding to 27 switch states are given, and each switch state corresponds to the corresponding voltage vector output by the inverter.

[0045] 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 phase voltage vector e, line current vector i, inductance L and resistance R:

[0046]

[0047] In formula (1), by ignoring the resistance of t...

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Abstract

The invention discloses a dual-model direct power prediction control method of a three-level grid-connected inverter. Dual-model direct power prediction control is used to adjust the instant active and reactive power of the grid-connected inverter, and a neutral-point voltage is balanced. Dual-model direct power prediction control comprises the steps that two direct power prediction models are established, a sector area of an optimal switching state is obtained, the optimal switching state in the sector area is obtained, and the optimal switching state of the three-level grid-connected inverter is used to control switching devices of the inverter. According to the invention, the algorithmic operand can be reduced, calculating resources are saved, time delay caused by a control algorithm is reduced, and the grid-connected inverter controlled by the method is high in performances.

Description

technical field [0001] The invention relates to the technical field of grid-connected inverters, in particular to a dual-model predictive direct power control method for a three-level grid-connected inverter. 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 grid-connected inverter is the interface between the distributed power generation system and the grid. Compared with the traditional two-level inverter, the three-level inverter has low harmonic content, small switching loss, and high power quality and efficiency. a lot of. [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, an objective function is constructed, and the optimal switch state that makes the obj...

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Application Information

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IPC IPC(8): H02M7/487H02M7/5387H02M7/539
CPCH02M7/487H02M7/5387H02M7/539
Inventor 康龙云程建材胡毕华肖文哲
Owner SOUTH CHINA UNIV OF TECH
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