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Power system transient stability analysis method taking wind power and direct current comprehensive effects into consideration

A transient stability analysis and comprehensive technology, applied in wind power generation, electrical components, circuit devices, etc., can solve problems such as single analysis level, improved or reduced system transient stability, and low applicability

Active Publication Date: 2018-11-06
SICHUAN UNIV
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Problems solved by technology

[0005] However, the existing analysis methods only qualitatively or quantitatively analyze the impact of wind power access on the transient stability of the system, and the analysis level is single; although the factors considered are relatively comprehensive, the actual criteria proposed in some cases are still not sufficient. It is determined that the transient stability level of the system is improved or decreased compared with that before the wind power is connected, and the applicability is low; for the case of AC and DC parallel operation, the influence of the DC system is ignored in the analysis of the effect of wind power, and there is currently no application for wind power and DC Analytical Method of Influence Mechanism of Synthetic Action on Transient Stability of Power Network

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  • Power system transient stability analysis method taking wind power and direct current comprehensive effects into consideration
  • Power system transient stability analysis method taking wind power and direct current comprehensive effects into consideration
  • Power system transient stability analysis method taking wind power and direct current comprehensive effects into consideration

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Embodiment Construction

[0066] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. like figure 1 As shown, the double-fed asynchronous wind turbine structure shows that the wind turbine captures wind energy and converts it into mechanical power P mw :

[0067]

[0068] In the formula: ρ is the air density; A is the swept area of ​​the impeller; v w is the wind speed; C P is the power conversion coefficient, which is jointly determined by the tip speed ratio λ and the pitch angle β; P B is the power reference value. When the wind speed is determined, the mechanical power is determined by C P Decide.

[0069] Taking the stator voltage vector of the doubly-fed asynchronous wind turbine as the q-axis, the doubly-fed asynchronous motor model established in the synchronously rotating dq0 coordinate system is:

[0070]

[0071] In the formula: u ds , u qs 、ψ ds 、ψ qs are the components of the stator voltage ...

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Abstract

The invention discloses a power system transient stability analysis method taking wind power and direct current comprehensive effects into consideration; a system transient steady-state analysis modelwhich is connected with wind power in an alternating-current and direct-current non-parallel transmission mode is established, and the quantitative indexes of large-scale wind power access to systemtransient stability influence are provided; a quantitative analysis method by enabling the wind power and direct current comprehensive effects to be equivalent to system equivalent mechanical power increment is proposed; and a qualitative analysis method considering influence of the wind power and direct current comprehensive effects to change of an acceleration area and a deceleration area is proposed based on equal area determination. According to the method, the implementation is convenient, the analysis method is clearer and more effective, the applicability is high, and the analysis is simple and convenient; and meanwhile the application range is wide, the analysis effect is good, the application scenes are wide, and the problem of practical engineering can be solved.

Description

technical field [0001] The invention relates to the technical field of power system stability analysis, in particular to a power system transient stability analysis method considering the comprehensive effect of wind power and direct current. Background technique [0002] The doubly-fed induction generator (DFIG) has the characteristics of electromechanical decoupling and has been widely used in wind power generation. The advanced high-voltage direct current transmission technology can meet the requirements of large-scale new energy transmission, but the energy diversity and complex hybrid transmission structure also bring new challenges to the stability of the power grid. The wind farm itself has no power angle stability problem, but wind power with different scales and penetration rates will affect the stable operation of the system by affecting the adjacent thermal power units. [0003] At present, there are few studies that comprehensively consider the influence of wind...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCH02J3/386H02J2203/20Y02E10/76
Inventor 刘天琪江琴曾雪洋李保宏陈相印月张英敏
Owner SICHUAN UNIV
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