Ordered binary decision diagram modeling method for distribution network fault recovery
A binary decision diagram, distribution network fault technology, applied in electrical components, circuit devices, emergency protection circuit devices, etc., can solve problems such as restricting practicability, complex programming implementation and logic, and difficulty in meeting the rapidity of fault recovery requirements.
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Embodiment 1
[0043] Such as figure 2 As shown, it is the distribution network diagram used in this embodiment. The distribution network has 33 nodes in total, the active load is 3,715kW, the reactive load is 2,300kVar, and node 1 is a slack node. 12.66kV, the power reference value is 10MVA). There are switches on each branch, that is, the number of switches is equal to the number of branches, figure 2 In , the solid line represents the branch circuit equipped with isolating switch, and the dotted line represents the tie line equipped with tie switch. In this example, it is assumed that there is a failure near 9 nodes.
[0044] Such as figure 1 As shown, it is a control flow chart of the ordered binary decision-making graph modeling method for distribution network fault recovery of the present invention, and the specific flow of its control is as follows:
[0045] (1) If there is a fault near node 9, the section switch 8-9, 9-10 is disconnected to automatically isolate the fault, and ...
Embodiment 2
[0070] In this embodiment, except for the following features, all the other features are the same as those in Embodiment 1: if there is a fault near node 5, the spare capacity of the tie switch is all set to 480kVA, and the specific operation steps are as follows:
[0071] (1) When there is a fault near node 5, the section switches 4-5 and 5-6 are disconnected to isolate the fault. There are 21 non-fault outage areas, with a total of 20 section switches and 4 contact switches. Therefore, there are 24 decision variables, and the other side of the tie switch is equivalent to a power node, and renumbered together with the non-fault blackout area, as Figure 4 shown;
[0072] (2) Form an adjacency matrix:
[0073]
[0074] (3) Use the WarShall algorithm to form a reachability matrix P;
[0075] (4) Form various constraints:
[0076] a) Form a power constraint C 1 ,
[0077] Since the other side of the tie switch is equivalent to the power supply, the constraint can be expr...
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