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A high-penetration wind power system wind power branch mode energy analysis method

A technology of power system and analysis method, which is applied in wind power generation, reducing/preventing power oscillation, and single-grid parallel feeding arrangement, etc., can solve the problems of insufficient energy angle analysis of high-penetration wind power system, and achieve high practical application. Value, suppression of low frequency oscillations, clear effect of physical meaning

Active Publication Date: 2020-12-22
STATE GRID CORP OF CHINA +2
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Problems solved by technology

However, the energy perspective analysis of the high-penetration wind power system has not been in-depth.

Method used

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  • A high-penetration wind power system wind power branch mode energy analysis method
  • A high-penetration wind power system wind power branch mode energy analysis method
  • A high-penetration wind power system wind power branch mode energy analysis method

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Embodiment Construction

[0053] A high-penetration wind power system wind power branch model energy analysis method, first, the theoretical analysis of the small disturbance stability of the power system containing wind power,

[0054] The synchronous generator adopts the classic second-order model, ignoring the excitation system and speed regulation dynamics, and the double-fed fan DFIG adopts the fifth-order model. The differential equation of the synchronous generator and the double-fed fan is

[0055]

[0056] Among them: δ is the power angle of the generator, ω is the speed of the generator, ν w is the wind speed, ω mis the rotor angular velocity of DFIG, θ p is the pitch angle of DFIG, i dr is the d-axis rotor current of DFIG, i qr is the q-axis rotor current of DFIG, M is the inertia time constant of the generator, P m is the mechanical power of the generator, P E is the electromagnetic power of the generator, τ is the time constant, T m is the mechanical torque of DFIG, T e is the el...

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Abstract

A high-permeability wind-driven power system wind power branch mode energy analysis method belongs to the technical field of power system operation and maintenance. The method constructs a simple andvisualized wind-driven power system wind power branch mode potential energy function with a clear physical meaning by modeling the wind-driven power system wind power branch mode energy, can accordingly analyze the composition and the variation law of the wind power branch mode potential energy, studies the influence of the change of the branch mode potential energy on the small disturbance stability of the system, can also analyze the sensitivity to state variables of the wind power branch mode potential energy, analyzes the sensitivity to different state variables, and controls and suppresses the low-frequency oscillation by adjusting the state variables. The method constructs a simulation example, compares the wind power branch mode potential energy measured after disturbance with the frequency-domain mode potential energy, verifies validity, and has a high practical value.

Description

technical field [0001] The invention belongs to the technical field of power system operation and maintenance, and in particular relates to an energy analysis applied to the quantitative analysis and suppression of low-frequency oscillation in a high-permeability wind power system. Background technique [0002] The high proportion of renewable energy connected to the grid will become an important feature of the future power system. The randomness and uncertainty of high-penetration wind power output have exacerbated the complexity of the small-disturbance stability of the power system, making the safe and stable operation of the power system face even greater challenges. challenge. [0003] The energy function can describe the energy change relationship of the power system. Some scholars have introduced the energy function into the problem of low-frequency oscillation, analyzed the mechanism of low-frequency oscillation from the perspective of energy, effectively identified ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24H02J3/38
CPCY02E10/76
Inventor 刘铖蔡国伟孙正龙李同高长征郭利孙平刘座铭毕正军王佳蕊孙旭徐博丁伟费藤答蔡丽霞刘畅孟涛高松
Owner STATE GRID CORP OF CHINA
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