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Stabilization method of droop-controlled three-phase grid-connected inverter

A stabilization method and inverter technology, applied in AC network circuits, single-network parallel feeding arrangements, output power conversion devices, etc., can solve the problems of cumbersome system stability analysis, inconvenience in optimizing system parameters, etc. Operation, solving improper design of control parameters, the effect of strong stability margin

Pending Publication Date: 2022-03-08
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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Problems solved by technology

Its defect is that once the parameters of the system change, the model of the new system needs to be re-established, which makes the system stability analysis cumbersome, and it is not convenient to optimize the system parameters and improve the system stability.

Method used

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  • Stabilization method of droop-controlled three-phase grid-connected inverter
  • Stabilization method of droop-controlled three-phase grid-connected inverter
  • Stabilization method of droop-controlled three-phase grid-connected inverter

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Embodiment Construction

[0043] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0044] The invention provides a method for stabilizing a droop-controlled three-phase grid-connected inverter.

[0045] The invention aims at the three-phase grid-connected inverter system with droop control, and establishes the impedance model Z pp . For impedance model Z pp Through characteristic analysis, it is found that the droop control parameters can reshape the impedance curve of the grid-connected inverter. On the basis of the impedance model, the grid-connected inverter is stabilized by using the impedance analysis method, and the droop control parameters can be optimized to further increase the stability margin of the grid-connected inverter.

[0046] The flow chart of the present invention is as Figure 5 As shown, the specific method is as follows:

[0047] Step 1. Construct the impedance model Z of the three-phase grid-connected inverter...

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Abstract

The invention discloses a stabilization method of a droop control three-phase grid-connected inverter. According to the method, the impedance model Zpp is established for a three-phase grid-connected inverter system for droop control, the stability of the grid-connected inverter is realized by using an impedance analysis method on the basis of the impedance model, the stability judgment and control of the grid-connected inverter for droop control after grid connection can be effectively realized, the error is small, the speed is high, droop control parameters can be optimized, and the stability of the grid-connected inverter is improved. And the stability margin of the grid-connected inverter is further increased.

Description

technical field [0001] The invention relates to the technical field of renewable energy power generation, in particular to a method for stabilizing a droop-controlled three-phase grid-connected inverter. Background technique [0002] In recent years, with the depletion of traditional energy and the pursuit of clean energy, renewable energy such as wind energy and solar energy has been vigorously developed. The renewable energy power generation device in the microgrid uses power electronics technology to integrate electric energy into the large grid through a grid-connected inverter. The capacity of renewable energy power generation devices continues to increase, and the number of grid-connected inverters is also increasing day by day, so the control of grid-connected inverters is particularly important. In order to realize the parallel connection of a large number of grid-connected inverters, realize power sharing and avoid circulating current, a droop control method is pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/493H02J3/38
CPCH02M7/493H02J3/38H02J2203/10H02J2203/20
Inventor 李震张金洲刘斌陆昱锟
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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