DC distribution network reliability assessment method based on Bayesian network

A Bayesian network and reliability technology, which is applied in the field of distribution network, can solve problems such as time-consuming, and achieve the effect of small calculation amount, reduced calculation amount and calculation time

Inactive Publication Date: 2016-08-03
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +2
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Problems solved by technology

The principle of the simulation method is simple and is not limited by the size of the system. The calculation accuracy is proportional to the square root of the number of simulations. However, when the system scale is large, the simulation method takes a lot of time to achieve a relatively high accuracy.

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  • DC distribution network reliability assessment method based on Bayesian network
  • DC distribution network reliability assessment method based on Bayesian network
  • DC distribution network reliability assessment method based on Bayesian network

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Embodiment Construction

[0049] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0050] see figure 2 , a Bayesian network-based DC distribution network reliability evaluation method of the present invention is characterized in that it includes the following steps:

[0051] Step S1, based on the optimal DC power flow, using the ergodic method to determine the MC of the DC power distribution system;

[0052] Step S2, constructing a three-layer BN model of the DC power distribution system according to the components of the system and the minimum cut set;

[0053] Step S3, using the failure rate and repair rate of the system components to calculate the marginal probability distribution (MPD) of the first layer of components, and then using the logical relationship between layers and internal elements of the layer to determine the ...

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Abstract

The invention discloses a DC distribution network reliability assessment method based on a Bayesian network. The method comprises the following steps that the minimum cut set of a DC power distribution system is determined by utilizing a traversal method; a three-tier Bayesian model of the DC power distribution system is constructed according to the elements and the minimum cut set of the system; marginal probability distribution of the first tier elements of the three-tier Bayesian model is determined by utilizing the failure rate and the repair rate of all the elements of the first tier, and then the marginal probability distribution table of the three-tier Bayesian model is determined by utilizing the logical relationship between the elements of tier to tier and the intra-tier elements; when the number of the system elements exceeds a preset value, a virtual node tier is additionally arranged between the second tier and the third tier of the three-tier Bayesian model so that a power distribution network Bayesian model including virtual nodes is obtained; and reliability of the DC power distribution network is assessed by utilizing the Bayesian model. The failure condition of the minimum cut set associated with the DC power distribution system is analyzed by utilizing the Bayesian network so as to realize reliability analysis of the whole system.

Description

technical field [0001] The invention relates to a Bayesian network-based reliability evaluation method for a DC distribution network, which belongs to the technical field of distribution networks. Background technique [0002] In the existing urban distribution network, the traditional AC power distribution method is still the mainstream. However, with the continuous development of power electronics technology, compared with the AC distribution network, the DC distribution network has achieved technical and economic advantages in many aspects. For example, it saves the commutation link required for distributed power supply and DC load access, reduces equipment cost and commutation loss; reduces power loss and voltage drop caused by reactive power transmission, and improves power supply capacity and power supply radius; With a converter capable of four-quadrant operation, the controllability of the power distribution system is enhanced, and the power quality of the AC side i...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06Q50/06
CPCG06Q10/0639G06Q50/06
Inventor 袁晓冬柳丹徐青山李强陈兵吕振华杨雄
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
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