Method for evaluating efficiency of power distribution network based on boundary power supply capability

A technology of power supply capacity and evaluation method, applied in the field of distribution network, can solve problems such as the inability to fully describe the efficiency of the distribution system, and achieve the effect of overall efficiency

Active Publication Date: 2017-11-07
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the safety boundary may solve the problem that a single TSC cannot fully describe the efficiency of the power distribution system

Method used

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  • Method for evaluating efficiency of power distribution network based on boundary power supply capability
  • Method for evaluating efficiency of power distribution network based on boundary power supply capability
  • Method for evaluating efficiency of power distribution network based on boundary power supply capability

Examples

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Comparison scheme
Effect test

Embodiment 1

[0045] A distribution network efficiency evaluation method based on boundary power supply capacity, see figure 1 , the method includes the following steps:

[0046] 101: For a distribution network with a given network structure and network parameters, obtain multiple boundary operating points that can describe the security boundary;

[0047] 102: Calculate the BSC value of all operating points to obtain the sampling BSC distribution, and perform processing analysis on it:

[0048] 103: Sorting by BSC size to get the BSC sorting curve, and further statistics to get the BSC proportion map;

[0049] 104: Finally calculate the BSC index to comprehensively reflect the efficiency of the distribution network.

[0050] In summary, the embodiment of the present invention calculates the distribution of boundary power supply capacity by using the safety boundary of DSSR through the above steps 101 to 104. This method can evaluate the efficiency of the distribution network more comprehe...

Embodiment 2

[0052] The scheme in embodiment 1 is further introduced below in conjunction with specific examples and calculation formulas, see the following description for details:

[0053] 201: prepare data;

[0054] DSSR is defined as the set of all operating points satisfying the N-1 safety criterion in the distribution network, expressed by Ω DSSR Indicates; and the working point on the DSSR boundary (safety boundary) is in a critical safety state, that is, as long as any load is increased, N-1 failure will definitely occur.

[0055] Therefore, define a certain working point W on the safety boundary b The power supply capacity of , referred to as BSC, is the working point W b The sum of loads, its mathematical expression is as follows:

[0056] BSC=∑W b (1)

[0057] W b ∈B DSSR (2)

[0058]

[0059] In the formula, W b =(F 1 ,F 2 ,…F i ...,F n ) T ;F i is the feeder section load; n is the number of feeder sections in the whole network; f u is the uth feeder load; C ...

Embodiment 3

[0091] The following is combined with specific Figure 2-Figure 5 , Table 1-Table 4, and calculation formula carry out feasibility verification to the scheme in embodiment 1 and 2, see the following description for details:

[0092] 1. Basic situation of the calculation example:

[0093] Distribution network A and distribution network B are constructed based on the IEEE-RTBS-BUS4 example, and the feeder contact position of distribution network B is more reasonable. The two examples have the same TSC but different BSC distribution. By comparing the BSC distribution to judge the advantages and disadvantages of the two distribution networks, and then select the network with higher efficiency.

[0094] The grid structures of distribution network A and distribution network B are as follows: figure 2 and image 3 As shown, the parameters of the two are the same: a total of 3 35kV substations and 7 circuits of 10kV feeders, including 6 circuits of single contact feeder and 1 circ...

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Abstract

The invention discloses a method for evaluating the efficiency of a power distribution network based on boundary power supply capability, and the method comprises the following steps: defining the power supply capability of one working point on a safety boundary as the boundary power supply capability, and obtaining a plurality of boundary working points which can completely describe the safety boundary for the power distribution network with the given network structure and network parameters; calculating the boundary power supply capability of all boundary working points, and obtaining the boundary power supply capability distribution; carrying out the ordering according to the size of the boundary power supply capability, obtaining an ordering curve, carrying out the further statistics to obtain the ratio graph of the boundary power supply capability; finally calculating a boundary power supply capability index, so as to comprehensively reflect the efficiency of the power distribution efficiency. According to the invention, the method achieves the calculation of the distribution of the boundary power supply capability through a safety boundary of a DSSR (distribution system safety region), and achieves the complete and comprehensive evaluation of the efficiency of the power distribution network.

Description

technical field [0001] The invention relates to the field of distribution networks, in particular to a distribution network efficiency evaluation method based on boundary power supply capacity. Background technique [0002] N-1 safety criterion is an important criterion for distribution network planning and operation [1] , refers to whether it can ensure continuous power supply to the load when a certain component is out of operation, and at the same time meet the operating requirements such as equipment not being overloaded; it is divided into feeder N-1 constraints and main transformer N-1 constraints. Maximum power supply capacity (Total Supply Capacity, TSC) [2] It refers to the maximum load supply capacity under the condition that the distribution network in a certain power supply area meets the N-1 safety criterion and takes into account the actual operation constraints; it is similar to the maximum transmission capacity (Total Transmission Capacity, TTC) in the trans...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06Q50/06
CPCG06Q10/06393G06Q50/06
Inventor 肖峻张苗苗张宝强佘步鑫
Owner TIANJIN UNIV
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