Unscented transformation method for analyzing voltage stability probability of system containing wind power

A voltage stabilization, traceless transformation technology, applied in power network operating system integration, wind power generation, system integration technology, etc., to achieve high calculation accuracy, easy to understand and use, and easy to achieve.

Pending Publication Date: 2019-09-10
ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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Problems solved by technology

[0004] Existing methods for probability analysis of voltage stability are difficult to meet the above four conditions at the same time, and existing methods need to use technologies such as orthogonal transformation and Nataf transformation to deal with related random variables

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  • Unscented transformation method for analyzing voltage stability probability of system containing wind power
  • Unscented transformation method for analyzing voltage stability probability of system containing wind power
  • Unscented transformation method for analyzing voltage stability probability of system containing wind power

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Embodiment Construction

[0035] In order to better understand the present invention, the present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0036] Such as figure 1 As shown, an unscented transformation method for analyzing the probability of voltage stability of a wind power system includes the following steps: S1: Select the load margin index as the index for evaluating the static voltage stability of the power system, and use it as the objective function, considering the load margin index The extended power flow equation of the margin parameters and the static security constraints of the system establish a nonlinear programming model for the static voltage stability critical point; the established nonlinear programming model for the static voltage stability critical point is:

[0037]

[0038] In the formula: S B is the set of nodes; S Gis the set of generator nodes; S R is the set of reactive power sources; P Gi is the active...

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Abstract

The invention belongs to the technical field of voltage stability of power systems, and specifically relates to an unscented transformation method for analyzing the voltage stability probability of asystem containing wind power. First, a static voltage stability probability evaluation model is established by considering the randomness of wind farm output and the uncertainty of load increasing direction; then, the voltage stability probability evaluation problem is converted into deterministic static voltage stability analysis of a small number of sample points by using a UT method; and finally, the deterministic problem is solved by the modern interior point method to obtain the mean value and covariance matrix of an output random variable. The original probability analysis problem is converted into a deterministic optimization problem, and the influence of the wind speed correlation between wind farms close to each other on the probability distribution of critical power is analyzed.The method is easy to implement and efficient in calculation, and can be used in online calculation of power systems. The voltage stability probability obtained is more accurate in analysis and has high calculation accuracy, and is convenient for power system dispatchers and operators to understand and use.

Description

technical field [0001] The invention belongs to the technical field of power system voltage stability, and in particular relates to a traceless transformation method for analyzing the probability of voltage stability of a wind power system. Background technique [0002] Load margin and critical power are effective indicators for analyzing the probabilistic stability of system voltage. At present, Monte Carlo simulation (Monte Carlo, MC) is an effective method for probabilistic analysis of voltage stability. It has strong adaptability, but the disadvantages of slow convergence and many simulation times limit its practical application. Bu S Q, Du W, Wang HF.Probabilistic Analysis of Small-Signal Rotor Angle / Voltage Stability of Large-Scale AC / DC Power Systems as Affected by Grid-Connected Offshore WindGeneration[J]. The voltage stability probability assessment method based on surface method, and the orthogonal transformation technology is used to deal with the correlation of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/46H02J3/14G06Q50/06
CPCH02J3/00H02J3/46H02J3/14G06Q50/06H02J2203/20Y02E10/76Y04S10/50Y04S20/222Y02E40/70Y02B70/3225
Inventor 郭小璇韩帅孙乐平吴宛潞秦丽娟杨艺云肖静吴宁冯玉斌
Owner ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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