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Wind-fire coupling system stability judgment and compensation method based on equivalent open-loop process

A technology of coupling system and determination method, applied in the direction of reducing/preventing power oscillation, AC network circuit, electrical components, etc., can solve the problem of inaccurate stability determination results, and achieve a simple and effective determination method, accurate results, and easy verification. Effect

Active Publication Date: 2022-01-04
HUAZHONG UNIV OF SCI & TECH +1
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  • Abstract
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  • Claims
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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for determining and compensating the stability of the wind-fire coupling system based on an equivalent open-loop process. accurate technical questions

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  • Wind-fire coupling system stability judgment and compensation method based on equivalent open-loop process
  • Wind-fire coupling system stability judgment and compensation method based on equivalent open-loop process
  • Wind-fire coupling system stability judgment and compensation method based on equivalent open-loop process

Examples

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Effect test

Embodiment 1

[0102] Example 1: Validation of the validity of the proposed stability criterion.

[0103] Figure 7 Bode plots of the characteristic transfer function of the equivalent single-input single-output system under different frequency modulation parameters are given. Figure 8 In (a)-(d) give and Figure 7 The time-domain simulation results of the wind-fire coupling system under the same working conditions. From Figure 7 It can be seen that the phase-frequency characteristic curves in the Bode diagram of the characteristic transfer function corresponding to Case 1 and Case3 pass the imaginary axis clockwise (the angle decreases) in the subsynchronous frequency range, and the phase-frequency characteristic curve in the Bode diagram of the characteristic transfer function corresponding to Case 2 In the subsynchronous frequency range, the imaginary axis passes counterclockwise (the angle increases). According to the proposed criterion, the wind-fire coupling system under Case 1 an...

Embodiment 2

[0104] Example 2: Validation of the effectiveness of the phase reshaping control strategy based on the proposed criterion.

[0105] Figure 9 Bode plots of the characteristic transfer function of the equivalent single-input single-output system under different frequency modulation parameters are given. Figure 10 Among (a)-(c) give and Figure 9 The time-domain simulation results of the wind-fire coupling system under the same working conditions. Case 1 is the simulation working condition of the wind-fire coupling system without adding the frequency modulation link; Case 2 is the corresponding wind-fire coupling system simulation working condition of adding the frequency modulation link but not adding the phase compensation link; Case 3 is adding the frequency modulation link and adding the phase The simulation working conditions of the wind-fire coupling system corresponding to the compensation link. From Figure 9 It can be seen that the phase-frequency characteristic cu...

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Abstract

The invention discloses a wind-fire coupling system stability judgment and compensation method based on an equivalent open-loop process, and belongs to the technical field of new energy grid-connected system stability analysis and control. The method comprises the following steps: decoupling a wind-fire coupling system through an equivalent open-loop process to obtain a fan considering virtual inertia and droop control and a residual subsystem without the fan; establishing a multivariable open-loop frequency domain model for the fan and the remaining subsystems considering the virtual inertia and droop control, and converting the multivariable open-loop frequency domain model into a single-variable closed-loop transfer function; taking the reciprocal of the closed-loop transfer function as a characteristic transfer function, and judging the stability of the wind-fire coupling system through the characteristic transfer function; and when the wind-fire coupling system is judged to be unstable, performing phase compensation on a phase-locked loop of the wind-fire coupling system. The stability judgment result is accurate, subsynchronous oscillation suppression is performed through phase compensation, and a satisfactory frequency modulation effect can be achieved on the premise of ensuring the stability of a coupling system.

Description

technical field [0001] The invention belongs to the technical field of stability analysis and control of new energy grid-connected systems, and more specifically relates to a method for determining and compensating the stability of a wind-fire coupling system based on an equivalent open-loop process. Background technique [0002] With the rapid development of renewable energy, on the one hand, power electronic equipment is widely connected to the power grid, and its non-linearity leads to more power system oscillation problems, especially the subsynchronous oscillation problem; on the other hand, the interaction between renewable energy and local thermal power units The mutual coupling is becoming more and more obvious. The coupling and integration at the same grid-connected point is a unified control object. This scenario is common in the northern power grid of my country. Therefore, a method that can accurately analyze the oscillation stability of the wind-fire coupling sy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/38H02J3/46
CPCH02J3/241H02J3/381H02J3/466H02J2203/20H02J2300/28H02J2300/40Y02E10/76
Inventor 姚伟严才胡博艾小猛方家琨文劲宇顾洪群吕旭明崔岩刘景峰黄笑伯郭任周桂平
Owner HUAZHONG UNIV OF SCI & TECH
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