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A Design Method of Lcl Filters for Comprehensively Optimizing Harmonic Stability and Damping Loss

A filter design and stability technology, applied in AC networks to reduce harmonics/ripples, harmonic reduction devices, etc., can solve the problems of cumbersome design process, inconvenient application, and failure to consider harmonic stability of grid-connected systems and other problems, to achieve the effect of ensuring harmonic stability, low damping loss, and improving overall output power efficiency

Active Publication Date: 2022-07-26
FUZHOU UNIV
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  • Application Information

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Problems solved by technology

This method needs to repeatedly verify whether the selected parameters meet the restrictive conditions. If not, the value needs to be redesigned.
Therefore, the design process of this method is cumbersome, and the selected value is not necessarily the optimal solution, so it is very inconvenient to apply in actual engineering; another type of method is to optimize the target design with the minimum energy storage of the components or the total value of the inductance Filter parameters. Although this type of optimization design method achieves the optimal design of parameters in a certain performance, it does not consider the interaction of parameters in the entire inverter grid-connected system, does not introduce the concept of grid-connected common point resonance, and does not consider Harmonic Stability Problems of Grid-connected System

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  • A Design Method of Lcl Filters for Comprehensively Optimizing Harmonic Stability and Damping Loss
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  • A Design Method of Lcl Filters for Comprehensively Optimizing Harmonic Stability and Damping Loss

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[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0035] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0036] It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates that There are features, steps, operations, devices, components and / ...

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Abstract

The present invention relates to an LCL filter design method for comprehensively optimizing harmonic stability and damping loss, comprising the following steps: step S1: establishing a frequency domain model of the inverter connected to the grid through the LCL filter; step S2: establishing to reduce The damping loss is the objective function of the target; Step S3: use the improved cat swarm algorithm to optimize the filter parameters, and obtain a set of optimal parameters that take the damping loss as the optimization goal considering the harmonic stability of the grid connection point. The invention can ensure the harmonic stability of the grid-connected system of the new energy power generation inverter.

Description

technical field [0001] The invention relates to the field of new energy grid-connected design, in particular to an LCL filter design method for comprehensively optimizing harmonic stability and damping loss. Background technique [0002] In a new energy grid-connected system, the output of the inverter will contain a large number of harmonics. Therefore, a filter is generally added between the inverter and the power grid. The L-type filter can effectively suppress the harmonic current. However, as the output power of the inverter increases, the value of the L-type inverter increases. If the need is large, the overall cost of the filter will increase significantly. Compared with the L-type filter, the LCL-type filter has one more filter capacitor to shunt the high-frequency harmonic components. Under the same filtering effect, the total inductance value of the LCL filter is smaller than that of the L-type filter. However, the LCL filter is a third-order resonant system, and...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 邵振国王浩张嫣张逸黄新东
Owner FUZHOU UNIV