Medium voltage distribution-network looped-network switching operation method
A switching operation, ring network technology, applied in the direction of electrical components, circuit devices, etc., can solve frequent power outages, losses, power supply management and user inconvenience and economic problems, to improve operating efficiency, ensure safe operation, and ensure line phase sequence consistent effect
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Embodiment 1
[0017] Power flow calculation method and calculation software
[0018] Power flow calculation can be reduced to solving nonlinear equations mathematically, and its mathematical model is abbreviated as follows:
[0019] F(X ) = 0 is a nonlinear system of equations
[0020] in:
[0021] F= ( f1 , f2 ,……, f n ) T is the node balance equation;
[0022] X= (x1 , x2 , … , x n ) T is the voltage of each node to be obtained.
[0023] Calculation software: "Power System Analysis Comprehensive Program" (PSASP) developed and compiled by EPRI can be used.
[0024] Such as figure 2 Shown: Taking the simplified loop closing process diagram of 110kV Jianxi Substation and 110kV Binhe Substation in Nanyang Power Grid as an example, it is assumed that the busbar voltage nodes 1 and 2 of the high-voltage side of the Jianxi Substation and Binhe Substation before the ring closure are U1 and U2 respectively, and the medium-voltage side 3 , 4 nodes U3, U4, the transmission power is Sa, Sb re...
Embodiment 2
[0027] short circuit calculation
[0028] The most serious three-phase short-circuit current does not exceed the breaking capacity of the switch as the criterion, and when it exceeds, the ring network operation is abandoned. Mainly calculate the ring closing moment:
[0029] (1) A three-phase short circuit occurs in the loop closing line;
[0030] (2) A three-phase short circuit occurs on the 10kV busbar;
[0031] (3) A three-phase short circuit occurs on the 110 kV bus;
[0032] (4) A three-phase short circuit occurred on the 220 kV bus.
[0033] If the short-circuit current in the above four situations does not exceed the breaking capacity of the switch at each voltage level, the
[0034] Switches at all levels have no effect.
[0035] Such as Figure 4 Shown: Short-circuit current calculation table for the second line of 10kV west supply line and second line of 10kV coastal power supply at the moment of ring closing. It can be seen from the table that at the moment of...
Embodiment 3
[0037] Such as figure 1 As shown, a medium-voltage distribution network ring switching operation method includes the following steps:
[0038] f. Carry out closed-loop power flow calculation and short-circuit calculation analysis, and use the non-exceeding protection setting value and equipment dynamic stability limit as criteria to assist dispatching decisions;
[0039] g. Check the phase sequence on site to ensure that the line phase sequence of the ring network operation is consistent;
[0040] h. First close the contact switch L1 between substation A and B;
[0041] i. Separate the section switch K1 of the fault line A near the end of the tie switch L1;
[0042] j. Finally, disconnect the section switch Z1 of the faulty line A near the A end of the substation.
[0043] The present invention adopts the method of ring network switching operation. Before the ring network switching, it should carry out the calculation of the closing current, short-circuit calculation and an...
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