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NPC three-level virtual synchronous machine bridge arm fault tolerance model prediction control method

A technology of model predictive control and virtual synchronous machine, which is applied in the field of power electronics, can solve problems such as failure of grid-connected control strategies, lack of fault-tolerant design, failures not considered, etc., and achieve the effect of reducing capacitor voltage fluctuations and realizing fault-tolerant operation

Pending Publication Date: 2022-04-29
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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Problems solved by technology

However, the above method does not consider the problem that the converter switching device may fail during operation, lacks fault-tolerant design, and the grid-connected control strategy fails after the VSG fails, affecting the normal operation of the grid-connected system

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  • NPC three-level virtual synchronous machine bridge arm fault tolerance model prediction control method
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  • NPC three-level virtual synchronous machine bridge arm fault tolerance model prediction control method

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Embodiment Construction

[0066] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. 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.

[0067] The embodiment of the present invention provides a NPC three-level virtual synchronous bridge arm fault-tolerant model predictive control method, the steps of which are as follows:

[0068] Step 1: Analyze the operation mechanism when the NPC three-level VSG single-phase bridge arm fails, and reconstruct the NPC three-level VSG structure into a VSG bridge arm fault-tolerant structure; the NPC three-level VSG structure is as follows figure ...

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Abstract

The invention provides an NPC three-level virtual synchronous machine bridge arm fault tolerance model prediction control method which is used for solving the technical problem that after an NPC type three-level VSG bridge arm breaks down, a control strategy fails. The method comprises the following steps: firstly, reconstructing an NPC three-level VSG structure into a VSG bridge arm fault-tolerant structure, and establishing a prediction current model under a fault condition and a voltage vector of the VSG bridge arm fault-tolerant structure; secondly, acquiring the direct current side capacitor voltage at the current moment by using a sensor, and predicting the direct current capacitor voltage difference of the model at the next moment according to the direct current side capacitor voltage at the current moment; and finally, constructing a cost function with a delay compensation function, and selecting a voltage vector corresponding to the minimum value of the cost function as an optimal voltage vector to act on the next moment, thereby realizing VSG bridge arm fault-tolerant operation. After a switch device breaks down, the NPC three-level VSG can continuously run in a fault-tolerant mode, the effectiveness of the method is verified, and the running reliability of the VSG is improved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an NPC three-level virtual synchronous bridge arm fault-tolerant model predictive control method. Background technique [0002] Wind power and photovoltaic power generation are connected to the grid through power electronic converters, but their randomness and volatility pose challenges to the stable operation of the grid. Virtual Synchronous Generator (VSG) technology overcomes the shortcomings of low inertia and no damping of new energy power generation, improves the power grid's ability to absorb new energy, and promotes the implementation of the "double carbon" policy. However, the reliability of VSG in energy conversion and transmission directly affects the stable operation of the power grid. Therefore, the research on fault tolerance technology of VSG bridge arm has attracted more and more attention from experts and scholars. [0003] Professor Beck proposed Virt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02M7/487H02M7/5387H02M1/32H02J3/38H02J3/40H02J3/24H02P21/14
CPCH02M7/483H02M7/487H02M7/53871H02M1/32H02J3/381H02J3/40H02J3/24H02P21/14H02J2300/24H02J2300/28
Inventor 金楠肖晗谢欢武洁夏英巽陈墨樊武闯代东任侯智文马梓阳王锐
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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