Linear approximation method for border of static voltage stability domain of electric power system
A technology of static voltage stabilization and power system, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problems of lack of high efficiency, complex boundary topology characteristics, low computing efficiency, etc., to reduce computing time, improve perception ability, The effect of improving build efficiency
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Embodiment 1
[0050] An embodiment of the present invention provides a linear approximation method for the boundary of the static voltage stability domain of a power system, such as Figure 1-Figure 3 As shown, the method includes the following steps:
[0051] 101: Starting from the ground state power flow, the traditional optimal power flow is used to search for the first power system saddle node bifurcation point, and it is mapped to the two-dimensional active power injection space to obtain the boundary point of the static voltage stability domain;
[0052] 102: Change the power growth direction to the direction of the power growth direction angle decrease, calculate the saddle node bifurcation point of the power system under the new power growth direction through the Lagrangian multiplier method, and map it to the two-dimensional active power injection space to obtain new The boundary point of the static voltage stability domain; if the power growth direction angle is less than or equal...
Embodiment 2
[0056] The scheme in embodiment 1 is further introduced below in conjunction with specific calculation formulas and accompanying drawings, see the following description for details:
[0057] 201: Taking the ground state power flow as the starting point, use the traditional optimal power flow to search for the first power system saddle node bifurcation point;
[0058] Wherein, the step 201 includes:
[0059] 1) Obtain basic data, including: power system topology, branch parameters and ground state power flow state variable x 0 ;
[0060] The step of acquiring basic data is well known to those skilled in the art, and will not be described in detail in this embodiment of the present invention.
[0061] 2) Let the power system have a total of n b +1 node, among them, PQ (that is, active power and reactive power are known quantities) node l, PV (that is, active power and voltage amplitude are known quantities) node n b -l, number 0 is the balance node, number 1~l is the PQ node...
Embodiment 3
[0126] The following combined with specific examples, Figure 4 , Figure 5 and Image 6 , and table 1 carries out feasibility verification to the scheme in embodiment 1 and 2, see the following description for details:
[0127] This example is to search the SVSR boundary of the WECC3 machine 9-node system as an example to verify the effectiveness of this method. The WECC3 machine 9-node test system is as follows: Figure 4 shown.
[0128] Taking the load nodes 7 and 9 as the key nodes of voltage stability, the active power injection of nodes 7 and 9 is selected as the coordinate axis, and this method is used to construct the SVSR in the two-dimensional active load injection space.
[0129] Set the power growth direction d 1 =[ΔS d2 ,ΔS d3 ,ΔS d4 ,ΔS d5 ,ΔS d6 ,ΔS d7 ,ΔS d8 ,ΔS d9 ] T =[0,0,0,0,0,1,0,0] T , adopting the model optimization model of the first power system saddle node bifurcation point, along the initial power growth direction d 1 , to search for t...
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