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Grid-connected vsc integrated AC power system and its analysis method

An analysis method and power system technology, applied in the direction of irreversible DC power input conversion to AC power output, AC network to reduce harmonics/ripples, electrical components, etc., can solve harmonic interaction research, harmonic oscillation , No problems such as dynamic coupling were found

Active Publication Date: 2022-01-07
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] There is no research on how harmonic interactions are generated in AC power systems, and no dynamic coupling between control loops of multiple VSCs and PWMs has been found, resulting in harmonic oscillations

Method used

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  • Grid-connected vsc integrated AC power system and its analysis method
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  • Grid-connected vsc integrated AC power system and its analysis method

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Embodiment Construction

[0084] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

[0085] figure 1 A configuration of an AC power system integrated with a grid-tied VSC is shown. exist figure 1 In , the AC power system is represented by an infinite bus: I v and I dc are the AC current output from the grid-connected VSC and the DC current input to the grid-connected VSC; V v is the terminal AC voltage of grid-connected VSC; V p is the AC voltage at the infinite bus; V dc is the DC capacitor C d DC v...

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Abstract

Grid-connected VSC integrated AC power system and analysis method. The invention discloses an AC power system integrated with grid-connected VSC, including AC system, load, inductance Lv, resistance Rv, resistance Rd, filter, capacitor and control loop; AC system connection impedance Z l , impedance Z l Connect the resistor Rv, the resistor Rv is connected to the inductor Lv, the inductor Lv is connected to the VSC, and the VSC is connected to the capacitor Cd and the resistor Rd respectively; the capacitor Cd is connected to the control loop through the filter, the inductor Lv is connected to the control loop through the filter, and the control loop controls the VSC by PWM; The present invention establishes the harmonic state space model of multiple VSCs, so as to deeply study the details of how the harmonic interaction occurs in the AC power system caused by the multiple VSCs. In addition, the present invention applies the method of harmonic modal analysis, The coupling relationship between the control loop and the VSC harmonics is mathematically clarified.

Description

technical field [0001] The invention relates to the field of voltage source converters, in particular to a grid-connected VSC integrated AC power system and an analysis method. Background technique [0002] Voltage source converter (VSC) is widely used in wind power and photovoltaic power generation based on VSC direct current transmission due to its technical advantages. However, as a typical harmonic source, the grid-connected VSC injects a series of high-order harmonics into the main AC power system, which inevitably leads to harmonic pollution. Therefore, the mechanisms of the harmonic oscillation modes of grid-connected VSCs must be examined to understand how and when they become less damped, or even negatively damped. A careful study of modeling, simulation and propagation of steady-state VSC harmonics in steady-state VSC harmonics found that the harmonics are mainly related to inappropriate transmission line parameters and different higher harmonics produced by VSC ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/44H02M1/08H02M1/12H02J3/38H02J3/01
CPCH02M7/44H02M1/08H02M1/12H02J3/38H02J3/01Y02E40/40
Inventor 付强杜文娟姚竞宙王海风
Owner SICHUAN UNIV