Estimation method of capacity exchange ability between large regional grids of electric system

A technology of large area power grid and exchange capacity

Active Publication Date: 2013-07-24
WUHAN UNIV
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Problems solved by technology

Greene S [1] The sensitivity calculation method proposed by et al. needs to calculate the left eigenvector corresponding to the zero eigenvalue of the power flow Jacobian matrix at the critical point, which requires a large amount of calculation in solving large systems; Jiang Tao [2] pointed out that most of the voltage Stability indicators need to track and judge the singularity of the Jacobian matrix of the power flow or equilibrium point equation, which involves high-...

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  • Estimation method of capacity exchange ability between large regional grids of electric system
  • Estimation method of capacity exchange ability between large regional grids of electric system
  • Estimation method of capacity exchange ability between large regional grids of electric system

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Embodiment 1

[0040] Taking the EPRI-36 node 8 machine system as an example, the present invention comprises the following steps:

[0041] Step 1. In the case of the operation mode of increasing the exchange capacity, conduct a sensitivity analysis on the cross-section exchange capacity-voltage change ratio of each node to determine the most sensitive node of voltage;

[0042]The premise of the analysis based on the sensitivity of section switching capacity-voltage change ratio is: the response of the large-scale power grid section, channel, drop point and its nearby 500kV nodes to the change of large-scale switching capacity and the voltage support characteristics. Under the premise that active power is the main factor for capacity exchange and reactive capacity is balanced locally, the voltage change and its stability characteristics are mainly related to the change of active power; the maximum value of node transient voltage deviation is used for voltage sensitivity analysis. Conservativ...

Embodiment 2

[0062] A method for evaluating the capacity exchange capability between large-area power grids in a power system, which evaluates the capacity exchange capacity between large-area power grids on the basis of improved voltage sensitivity analysis. The steps of the method are the same as steps 1 to 4 of the specific embodiment. Figure 7 Take the 2012 planning model of the "Three China" (including North China, Central China, and East China) power grids as an example.

[0063] There are 1000kV UHV AC connections between North China and Central China, North China and East China, ±500kV and ±800kV DC connections between Central China and East China, and no AC connections, that is, there are two AC flow sections. The exchange capacity between North China and East China is fixed, and the capacity exchange section between North China and China is taken as the research object. Among them, North China is used as the sending end system, and Central China is used as the receiving end syste...

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Abstract

The invention discloses an estimation method of capacity exchange ability between large regional grids of an electric system. The method comprises the steps: based on sensitivity analysis of a section exchange capacity-voltage change ratio, carrying out analysis on the section exchange capacity-voltage stability of a tidal current section between the large regional grids, and obtaining the most sensitive node of voltage of a system; and carrying out spline interpolation on a trend of voltage change to sensitivity change, wherein the voltage change is based on the most sensitive node of the voltage of the exchange capacity, carrying out derivation after nonhomogeneous exponential function fitting is conducted on a discrete value obtained by the spline interpolation, obtaining a change rate function of the voltage change to sensitivity, calculating a limit of the exchange capacity according to discrimination conditions of a critical point of voltage stability, analyzing the voltage stability conditions of the system through a voltage stability margin, and carrying out checking and calibration on correctness of an inflection point and an estimation result of the exchange capacity.

Description

technical field [0001] The invention belongs to the field of safe technical operation of electric power systems, and more specifically relates to a method for evaluating capacity exchange capacity between large-area power grids of electric power systems based on improved voltage sensitivity analysis. Background technique [0002] The "Twelfth Five-Year Plan" period is an important stage for the development of my country's UHV power grid. The UHV transmission system has the characteristics of large transmission capacity, large power flow range, and no accident backup in the early stage of operation. The busbars of the 500kV tie-lines in the nearby area are mostly important large-capacity substation nodes and converter station nodes, resulting in the receiving end power grid being greatly affected by the operation status of the UHV transmission system. Once the UHV AC line itself fails, the receiving end The power grid will have the possibility of voltage instability, which will...

Claims

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Application Information

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IPC IPC(8): H02J3/06
Inventor 刘涤尘吴军董飞飞黄涌赵一婕宋春丽潘旭东王浩磊
Owner WUHAN UNIV
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