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Grid-connected inverter fault-tolerant control method based on sequence model predictive control

A technology of model predictive control and fault-tolerant control, which is applied to AC network circuits, output power conversion devices, and AC power input conversion to DC power output, etc. To achieve the effect of reducing the burden, reducing the number of loop operations, and efficient processing

Active Publication Date: 2021-12-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA +1
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  • Claims
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Problems solved by technology

However, the use of traditional model predictive control will also face two problems: one is the selection of weight factors for multi-objective cost functions, and the other is the problem of large amount of calculation

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  • Grid-connected inverter fault-tolerant control method based on sequence model predictive control
  • Grid-connected inverter fault-tolerant control method based on sequence model predictive control
  • Grid-connected inverter fault-tolerant control method based on sequence model predictive control

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Embodiment Construction

[0038] The technical solution will be clearly and completely described below in conjunction with preferred examples of the present invention and accompanying drawings. It should be understood that the preferred examples are only for illustrating the present invention, but not for limiting the protection scope 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.

[0039] The invention provides a fault-tolerant control strategy for the open-circuit failure of the horizontal bridge arm of the T-type three-level grid-connected inverter. The working state of the inverter is distinguished by judging the direction of the inverter side current, and the sequence model predictive control is adopted in the healthy state, and the sequence model predictive fault-tolerant control is adopted in the unhealthy st...

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Abstract

The invention relates to a grid-connected inverter fault-tolerant control method based on sequence model predictive control. In order to solve the fault-tolerant control problem of a T-type three-level LCL type grid-connected inverter when a horizontal bridge arm has a fault, model sequence prediction control is adopted, and the fault operation mode is divided into a healthy state and an unhealthy state by collecting the measured current of the inverter; model sequence prediction control is adopted for the health state, a vector effect table is used for screening alternative vectors, and the alternative vectors are used for controlling a cost function of grid-connected current; according to the model sequence prediction fault-tolerant control, two cost functions of firstly controlling the neutral-point voltage and then controlling the grid-connected current are designed; and finally, an obtained optimal switching vector is fed back to a grid-connected inverter, so that the neutral-point voltage of the inverter is balanced under a fault, high-quality current is output, and the reliability of a grid-connected control system is improved.

Description

technical field [0001] The invention belongs to the technical field of power electronic converter fault control, and in particular relates to a grid-connected inverter fault-tolerant control method based on sequence model predictive control. Background technique [0002] At present, grid-connected inverters, as a bridge to convert direct current into high-quality alternating current, play an important role in new energy distributed power generation systems. T-type three-level inverters have attracted extensive attention due to their excellent efficiency and controllability. Compared with the traditional two-level inverter, the T-type three-level inverter has lower grid-side current total harmonic distortion and higher power, and has been widely used in the low-voltage field. [0003] In recent years, there has been a surge of research around the topic of power converter reliability, as it is important for the stable and efficient operation of power electronic systems. In a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18H02M7/487H02M1/32
CPCH02J3/1842H02M7/487H02M1/32Y02E40/30Y02E10/56
Inventor 龙波曹天旭沈大为齐欣越
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA