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LCL parameter and control parameter design method and device for improving grid impedance adaptability

A technology of grid impedance and control parameters, which is applied in the direction of single grid parallel feeding arrangement, etc.

Inactive Publication Date: 2019-06-04
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
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Problems solved by technology

[0005] Although the second type of method can achieve the purpose of strong robustness of the inverter to the grid impedance through only one design of the inverter, most of the existing related design methods design the controller parameters and LCL filter parameters separately. The performance of the upper inverter depends on the controller parameters and LCL filter parameters, so the existing inverter design method is difficult to achieve the robustness of the inverter to the grid impedance while ensuring the stability of the inverter itself

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  • LCL parameter and control parameter design method and device for improving grid impedance adaptability
  • LCL parameter and control parameter design method and device for improving grid impedance adaptability
  • LCL parameter and control parameter design method and device for improving grid impedance adaptability

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[0078] A kind of LCL parameter and control parameter design method that improve grid impedance adaptability, it is characterized in that, may further comprise the steps:

[0079] S1: Decompose the nonlinear delay function according to Euler's formula to derive the proportional coefficient k of the current controller to ensure that the output admittance of the inverter does not include the pole of the right half plane p the analytical range;

[0080] S2: Deduce the active damping coefficient k to ensure that the inverter current open-loop transfer function does not contain the right half-plane pole d the analytical range;

[0081] S3: For active damping coefficient kd , current controller proportional coefficient k p , open-loop transfer function cut-off frequency ω c , resonant frequency ω r and the resonant frequency ω of the inverter-side LC r1 Normalized processing, the normalized active damping coefficient k that does not contain the poles of the right half plane d f...

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Abstract

The invention relates to an LCL parameter and control parameter design method and an LCL parameter and control parameter design device for improving grid impedance adaptability. Through theoretical calculation and actual requirements, specific values of an active damping coefficient k<d>, a current controller proportional coefficient k, an open-loop transfer function cutoff frequency omega<c>,a resonant frequency omega<r> and an inverter side LC resonant frequency omega<r1> are obtained through calculation, thus the integrated design of LCL parameters and control parameters can be realized, and the inverter with high adaptability to grid impedance variation can be obtained by adopting the inverter designed in the invention without additional compensation links or hardware equipment.

Description

technical field [0001] The invention belongs to the technical field of new energy grid-connected power generation, and in particular relates to a method and device for designing LCL parameters and control parameters that improve the adaptability of grid impedance. Background technique [0002] With the development of new energy sources such as photovoltaics and wind power, more and more inverters are connected to the grid, making the grid show more and more weak grid characteristics. The existence and uncertainty of the grid impedance in the weak grid lead to the reduction of the control performance of the LCL grid-connected inverter, which makes the power quality of the inverter connected to the grid worse, and even causes instability problems. In response to this problem, some literatures have proposed technical solutions to enhance the adaptability of LCL inverters to grid impedance, which mainly include two categories. [0003] The first type is to add a compensation ne...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
Inventor 郑晨李琼林张凌潘勇刘书铭刘雅娟代双寅张博唐钰政王毅
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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