Design method, equipment and medium of lcl filter parameters based on damping ratio

A technology of filter parameters and design methods, applied in output power conversion devices, electrical components, single-grid parallel feeding arrangements, etc. Low design efficiency and other problems, to achieve the effect of less design iterations, small damping loss, high design efficiency and precision

Active Publication Date: 2021-09-24
SHANGHAI JIAOTONG UNIV
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Problems solved by technology

[0007] 1) The design of passive damping value is inaccurate, which may lead to converter instability or excessive damping loss due to unreasonable damping value;
[0008] 2) Passive damping and high-frequency current attenuation require multiple iterative adjustments, resulting in low design efficiency and poor design accuracy

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  • Design method, equipment and medium of lcl filter parameters based on damping ratio
  • Design method, equipment and medium of lcl filter parameters based on damping ratio
  • Design method, equipment and medium of lcl filter parameters based on damping ratio

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Embodiment Construction

[0065] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0066] figure 1 It is a flow chart of LCL filter parameter design based on damping ratio in a preferred embodiment of the present invention. This method is suitable for occasions where the high-frequency component of the output side voltage of the LCL filter is relatively low, such as the inverter grid-connected working condition. The damping ratio-based LCL filter parameter design method in this embodiment first selects the converter side inductance and filter capacitor parameters according to the trad...

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Abstract

The present invention provides a method, device and medium for designing LCL filter parameters based on the damping ratio. Firstly, according to the traditional LCL filter design method, the converter side inductance and filter capacitor parameters are selected; then, using the damping ratio, the damping resistance and The value of the inductance on the output side is optimally designed; in addition, an iterative optimization scheme for the total inductance and resonance frequency is also provided. The present invention preferably adopts the optimum damping ratio of 0.28, which can ensure the stable operation of the converter system with the LCL filter with the minimum damping loss. The present invention has few design iterations, can guarantee the high-frequency attenuation design of the LCL filter is accurate, avoids the stability risk introduced by unreasonable damping design, and ensures that the selection of current control parameters is simple and direct, and is suitable for high output side voltage of the LCL filter. occasions with low frequency components.

Description

technical field [0001] The invention relates to the field of converter filter design, in particular to a damping ratio-based LCL filter parameter design method. Background technique [0002] Compared with traditional inductive filters, LCL filters have better attenuation performance for high-frequency current harmonics. In recent years, in order to meet the increasingly stringent grid-connected rules, more and more grid-connected converters have begun to use LCL filters to filter out switching subharmonics in the grid-connected current. However, there is an inherent resonant peak on the amplitude-frequency characteristic curve of the LCL filter, which easily leads to the instability of the converter system and brings challenges to the design of the current controller. In order to ensure the stability of the control, the converter system with the LCL filter generally adopts the method of active damping or passive damping to suppress the resonance peak. [0003] The main adv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/12H02M7/483H02J3/38
CPCH02J3/38H02M1/126H02M7/483
Inventor 马柯唐为禹
Owner SHANGHAI JIAOTONG UNIV
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