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Major network and island synchronization fault restoration algorithm for power distribution network including DGs

A distributed power supply and distribution network failure technology, which is applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve problems such as coordination of load shedding mode, complex recovery scheme, and inability to achieve global optimization, etc.

Inactive Publication Date: 2015-02-18
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2) Global optimization cannot be achieved, the two processes interfere with each other, and the optimum at each stage is not equivalent to the global optimum
[0006] In addition, for the problem of load shedding, the controllable loads in the current algorithm are mostly cut off directly as a means of supplying power to important loads as much as possible or expanding the scope of power supply, without considering its relationship with "disconnecting branch circuits". Circuit breakers form a downstream power loss area" coordination of load shedding methods
Therefore, the pros and cons of the recovery scheme largely depend on the distribution of important loads and controllable loads, and there may be too many switching operations and the result that the recovery scheme is too complicated

Method used

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  • Major network and island synchronization fault restoration algorithm for power distribution network including DGs
  • Major network and island synchronization fault restoration algorithm for power distribution network including DGs
  • Major network and island synchronization fault restoration algorithm for power distribution network including DGs

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Experimental program
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Embodiment

[0094] Examples, case analysis

[0095] The advantages mentioned above will be explained one by one through the comparison of three sets of calculation examples:

[0096] The power distribution system used in the example is as follows: Image 6 . The system contains a total of 118 nodes and 132 branches, all of which are equipped with tie switches or section switches. The power supply voltage is 11kV, and the total load is 22709.7+j17041.1 kVA. See the appendix for basic system data and DG information.

[0097] Reference scheme: Assuming that a serious failure occurs in the system, such as the failure of line 1-63, the algorithm proposed by the present invention is used for optimization. The recovery scheme is shown in Table 1, and the corresponding system single-line diagram is shown in Figure 7 , as can be seen from the figure, the scheme reconfigures the main network, forms isolated islands (2 isolated islands, Is1, Is2), forms de-energized areas (3 de-energized areas...

comparative approach 1

[0101] Comparison scheme 1: the same is the fault of line 1-63; however, the recovery scheme is formulated using the two-stage optimization idea of ​​"creating an island first and then reconfiguring the main network" which is commonly used at present.

[0102] The recovery scheme in this case is shown in Table 2, and the corresponding one-line diagram is shown in Figure 8 , the area inside the dotted line in the figure is the island solution obtained after the first step "island generation". This method mainly has the following two problems: 1) Due to the two-step nature of the algorithm, the island generation algorithm has an absolute priority. Driven by the optimization goal, the island will expand the power supply range as much as possible, and then seize the important load first. Leading to the destruction of important power supply paths in the main network reconstruction. From the optimization results, on the one hand, the island generation process preempts almost all i...

comparative approach 2

[0106] Comparison scheme 2: Assume a mild fault, such as the fault of line 30-31, and use the algorithm proposed by the present invention to optimize.

[0107] The recovery plan for this situation is shown in Table 3, and the corresponding one-line diagram is shown in Figure 9 . Under this scheme, the algorithm realizes fault recovery in the power-off area by complex network reconfiguration. It can be seen from the figure that the non-faulty area passes through 3 groups of contact feeders (40-9—8-24—25-35), feeder (43-54) and feeder (49-62) supported the power-off area, and finally no isolated island was formed. However, in the reference scheme, DG mainly recovered the load in the form of an isolated island. The main reasons are as follows: 1) The recovery ability of the main network the difference. In the reference scheme, before the main network expands the power supply range to the vicinity of the DG island, the recovery ability has reached its limit. At this time, even ...

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Abstract

The invention belongs to the field of power distribution network fault restoration algorithms, and discloses a major network and island synchronization fault restoration algorithm for a power distribution network including DGs. Based on an original power distribution system, virtual branch circuits are additionally arranged between the DGs and transformer substation nodes so that an expansion network can be formed, major network reconstitution, island generation and DG operating mode determination can be synchronously processed by executing a primary genetic algorithm in the following computation process, and thus global optimization can be achieved; then, the system enters in the genetic algorithm iterative process, a load shedding operator is introduced, and the specific shedding mode is decided according to the type and the position of the load to be shed; in addition, after each iteration, an infeasible network structure in a new population further needs to be amended, the network is kept to be a fully-communicated radial network, and the loss is lowered minimally after the power distribution network breaks down.

Description

technical field [0001] The invention belongs to the field of distribution network fault restoration algorithms, in particular to a main network and isolated island recovery synchronization algorithm containing distributed power distribution network faults. Background technique [0002] Compared with traditional centralized power generation, distributed generation (DG) has many advantages in terms of economy, environmental protection, energy utilization diversity, safety and reliability, etc., and has been widely concerned and applied worldwide. For the processing of DG operation mode, in the original standard IEEE 929-2000, from the perspective of system / personnel safety and power quality, it is required that the DG system should avoid the appearance of isolated islands, and all affected DGs must be out of operation when the system fails; With the continuous increase of DG penetration rate and the improvement of system automation level, starting from the IEEE 1547-2003 stand...

Claims

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Application Information

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IPC IPC(8): H02J3/00G06N3/12
CPCG06N3/12H02J3/0073H02J2203/20
Inventor 黄弦超杨雨任小宇孙秋洁江成程养春
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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