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Modeling method and subsynchronous oscillation analysis method for VSG-containing doubly-fed fan grid-connected system

A technology of sub-synchronous oscillation and doubly-fed fan, applied in the direction of reducing/preventing power oscillation, AC network circuit, single-network parallel feeding arrangement, etc., can solve the problems of incomplete mechanism explanation and insufficient research, and achieve clear physical meaning. , the effect of high model accuracy, strong scalability and extensibility

Active Publication Date: 2022-02-01
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

[0005] The research on VSG participating in the subsynchronous oscillation of DFIG grid-connected system is not enough, and the mechanism explanation of how VSG affects DFIG subsynchronous oscillation needs to be improved

Method used

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  • Modeling method and subsynchronous oscillation analysis method for VSG-containing doubly-fed fan grid-connected system
  • Modeling method and subsynchronous oscillation analysis method for VSG-containing doubly-fed fan grid-connected system
  • Modeling method and subsynchronous oscillation analysis method for VSG-containing doubly-fed fan grid-connected system

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Embodiment 1

[0108] Embodiment 1: as Figure 1-13 As shown, a method for modeling and subsynchronous oscillation analysis of a doubly-fed fan grid-connected system containing VSG, the present invention selects as figure 1 The shown VSG double-fed wind turbine grid-connected system is implemented as a case topology. The embodiment of the present invention adopts a doubly-fed wind power generating set, a rotor-side converter (RSC), a grid-side converter (GSC), a DC filter capacitor, a VSG controller, a phase-locked loop and a series compensation network. The VSG output voltage is connected to the grid-side converter as its input, the DC filter capacitor between the rotor-side converter and the grid-side converter constitutes a DC link, and the LCL filter of the grid-side converter is used as the output terminal to connect to the grid .

[0109] The preferred modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0110] Spe...

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Abstract

The invention discloses a modeling method and subsynchronous oscillation analysis method for a VSG-containing doubly-fed fan grid-connected system. The modeling method comprises the following steps of: establishing a full-order small signal state space equation of the VSG-containing doubly-fed fan grid-connected system under a dq rotating coordinate system; revealing the action mechanism of a VSG participating in subsynchronous oscillation from the perspective of DFIG output impedance; based on the established small signal state space equation, evaluating the influence effect of each module in the VSG-containing doubly-fed fan grid-connected system on a dominant oscillation mode containing a subsynchronous oscillation quantity through a participation factor analysis method, a damping ratio and an oscillation frequency; and verifying the correctness of the VSG participating in the subsynchronous oscillation mechanism analysis. The modeling method provided by the invention has relatively good applicability, extensibility and reference, and has the advantages of clear physical significance, high model precision and the like; the subsynchronous oscillation problem can be directly and simply analyzed based on the model; and the subsynchronous oscillation analysis method for the VSG-containing doubly-fed fan grid-connected system is very visual and effective.

Description

technical field [0001] The invention relates to a method for modeling and sub-synchronous oscillation analysis of a VSG-containing double-fed fan grid-connected system, belonging to the field of renewable energy power generation systems. Background technique [0002] In recent years, the high proportion of new energy connected to the grid has led to the continuous increase in the penetration rate of power electronic devices in the power grid. The large number of power electronic devices with low inertia and weak damping characteristics has brought great challenges to the safe and stable operation of the power grid. Among them, when the double-fed wind turbine (DFIG) sends out wind power through the series compensation line, it faces the threat of subsynchronous oscillation under the interaction between the converter and the grid. There have been many synchronous oscillation accidents at home and abroad, which have attracted extensive attention from scholars. [0003] At pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/24H02J3/381H02J2300/28Y02E10/76
Inventor 刘志坚骆军梁宁韩江北余成骏刘杰李鹏程王天艺廖雨欣
Owner KUNMING UNIV OF SCI & TECH
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