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A Method for Analyzing the Stability of Grid-connected Inverter System Using Modified Generalized Impedance Method

A system stability and inverter technology, applied in AC network circuits, single-network parallel feeding arrangements, circuit devices, etc., can solve problems such as unreasonable stability analysis of grid-connected inverters, and achieve error avoidance and accuracy high effect

Active Publication Date: 2018-02-27
YUNNAN POWER GRID +1
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Problems solved by technology

[0005] In order to solve the unreasonable problem of the stability analysis of the grid-connected inverter system at present, the present invention discloses a method for analyzing the stability of the grid-connected inverter system by using the modified generalized impedance method, which can be used to judge the stability of the grid-connected inverter considering the voltage feedforward filter The stability system when the inverter is connected to the grid, the criterion for stability analysis and judgment is called the modified generalized impedance criterion

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  • A Method for Analyzing the Stability of Grid-connected Inverter System Using Modified Generalized Impedance Method
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  • A Method for Analyzing the Stability of Grid-connected Inverter System Using Modified Generalized Impedance Method

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[0041] The technical solution in this embodiment will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the present invention. Apparently, the described embodiment is only a part of the examples of the present invention, not all examples. 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.

[0042] Such as figure 1 As shown, the technical solution of the present invention adopts the following steps:

[0043] 1) For the inverter single infinite system, the small signal model of the inverter port is established under the dq coordinates, and the generalized admittance interface model of the inverter is obtained according to the small signal model of the inverter port. The vectors of the system are in dq and xy A vector diagram of a coordinate system such as figur...

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Abstract

The invention relates to a method for analyzing grid-connected inverter system stability by a modified generalized impedance method. The method for analyzing the grid-connected inverter system stability includes establishing a small-signal model of an inverter under polar coordinates according to a grid-connected inverter system, and then establishing a generalized admittance interface model of the inverter and a generalized admittance interface model of a power grid; using the generalized admittance interface models to obtain modified generalized impedance of the inverter and the power grid; acquiring modified generalized impedance criteria from a ratio of the modified generalized impedance of the inverter to the modified generalized impedance of the power grid so as to be used for system stability analysis. The method for analyzing the grid-connected inverter system stability can be used for grid-connected inverter stability analysis with voltage feed-forward filtering reckoned in, is capable of better solving the coupling problem as compared with a general impedance method and can be used for accurately analyzing stability of large-scale grid-connected problems.

Description

technical field [0001] The invention relates to a method for analyzing the stability of a grid-connected inverter, in particular to a method for analyzing the stability of a grid-connected inverter system by using a modified generalized impedance method, and belongs to the field of inverters. Background technique [0002] As more and more power electronic devices are applied to power systems, such as new energy grid-connected inverters, HVDC systems, and FACTS systems, the power system gradually presents a trend of power electronics. More and more power electronic devices have gradually changed the operating characteristics of the power grid, leading to more stability problems in new interconnected systems, such as subsynchronous oscillations caused by the interaction between the control system of power electronics and the series compensation capacitance of transmission lines . [0003] In order to analyze the stability of the new inverter grid-connected interconnection sys...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
CPCH02J3/38H02J2203/20
Inventor 黄伟吴琛李子恒刘旭斐辛焕海邢玉辉杨浚文
Owner YUNNAN POWER GRID
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