Definition, networking form, operation mode and transition method of flexible distribution network
A technology of operation mode and distribution network, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve the problems of limiting reliability improvement, outstanding, and difficult to reach the maximum power supply capacity
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Embodiment 1
[0030] The embodiment of the present invention provides a definition, networking form, operation mode and transition method of a flexible distribution network, see figure 1 , the method includes the following steps:
[0031] 101: Reconstruction of overhead network single connection: install flexible opening and closing stations at both ends of the contact point to replace the contact switch; cable network single connection transformation: install flexible opening and closing stations at the ring network point, and realize the flexible closed-loop operation of the feeder through the flexible opening and closing stations;
[0032] 102: Overhead network multi-connection transformation: replace the traditional contact switch with a flexible opening and closing station to modify the wiring mode, close the other contact switch, and remove the modified redundant switch; cable network multi-connection transformation: transform the wiring method installation at the ring network point F...
Embodiment 2
[0041] The scheme in embodiment 1 is further introduced below in conjunction with specific calculation formulas and examples, see the following description for details:
[0042] 1. Definition of FDN
[0043] The embodiment of the present invention defines FDN as a distribution network capable of realizing flexible closed-loop operation. FDN has two features: the first feature is closed-loop, because FDN has the ability to block short-circuit current at the closed-loop point; the second feature is flexibility, that is, some nodes have the power flow of multiple branches connected to them. Multi-directional continuous adjustment capability can change the natural distribution of power flow to a certain extent from the perspective of the power grid. The closed-loop feature enables FDN to have higher power supply reliability, and can avoid short-term power outages during faults or maintenance; the flexible feature enables FDN to have stronger power flow control capabilities, and c...
Embodiment 3
[0075] Combine below Figure 9 , Table 1 and Table 2 carry out feasibility verification to the scheme in embodiment 1 and 2, see the following description for details:
[0076] Figure 9 The power grid consists of two 110kV substations, four 40MVA (transformer capacity unit) transformers, 12 feedback lines, 12 equivalent loads, and four three-terminal FSSs. f i Indicates the feeder i; L i Indicates the load carried by feeder i. A in the picture i , B i 、C i (i=1,2,3,4) indicates the node where the three ports of the FSS are located.
[0077] 1) Calculation data setting
[0078] The capacity of the main transformer is 40MVA, the capacity of the feeder is 8.92MVA, and the capacity of the three ports of each FSS is 10MVA.
[0079] 2) Normal operation results
[0080] After installing the FSS, the equivalent load distribution when the FDN reaches the maximum power supply capacity (TSC) is shown in Table 1.
[0081] Table 1 Equivalent load distribution when FDN reaches T...
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