A Fast Search Method for the Boundary of Static Voltage Stability Region in Power System
A static voltage stabilization and power system technology, applied in design optimization/simulation, special data processing applications, etc., can solve problems such as difficult universal conclusions, large conservatism, and large influence of SVSR boundary topology, achieving high precision and improving Construction efficiency and calculation time reduction effect
Active Publication Date: 2020-05-26
NORTHEAST DIANLI UNIVERSITY
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This hyperplane can describe the local topological characteristics of the SVSR boundary, but it is relatively conservative and cannot guarantee the global accuracy of the SVSR boundary, and the selection of different key parameters has a great influence on the topology of the SVSR boundary, so it is difficult to use a unified analytical formula to describe and obtain general conclusion
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[0096] This example is to search the SVSR boundary of the 9-node system of WECC3 machine as an example to verify the effectiveness of the fast search method for the static voltage stability region (SVSR) boundary. The 9-node test system of WECC3 machine is as follows: image 3 shown.
[0097] Select load nodes 5 and 7 as key nodes for voltage stability, and use the method of the present invention to search for the SVSR boundary in the two-dimensional active load space with the active power injection of nodes 5 and 7 as coordinate axes. Such as Figure 4 As shown, the ground state is taken as the starting point, and the initial power growth direction d is set 0 =[ΔS 2 ,ΔS 3 ,ΔS 4 ,ΔS 5 ,ΔS 6 ,ΔS 7 ,ΔS 8 ,ΔS 9 ] T =[0,0,0,0.9,0,1,0,0] T , the power imbalance caused by power growth is compensated by the generator where the balance node is located, where ΔS i is the complex power of node i, using CPF along d 0 traced Figure 4 In the initial SNB point 9, its coordina...
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The invention discloses a fast search method of a static voltage stability region (SVSR) boundary of an electric system. The method comprises the steps of determining a universal mathematical model of the SVSR boundary, determining an initial SVSR boundary point, initializing the universal mathematical model of the SVSR boundary, predicting an adjacent SVSR boundary point with a symbol as shown in the specification, correcting the predicted point with the symbol as shown in the specification to obtain a SVSR boundary corrected point with a symbol as shown in the specification adjacent to the initial SVSR boundary point z0, performing initial value cycling on the corrected point with the symbol as shown in the specification, searching a next adjacent SVSR boundary point by adopting the process, substituting s in a simultaneous gradient matrix and an additional equation to a symbol as shown in the specification in a cycling process until a power increase direction angle beta is less than 0 and greater than 90 degrees. The SVSR boundary constructed by the method has higher precision; and fast search of the SVSR boundary of the electric system in two-dimensional and high-dimensional active power injection spaces can be realized.
Description
technical field [0001] The invention relates to a boundary search problem of a static voltage stability domain. In particular, it relates to a fast search method for the boundary of static voltage stability domain in power system. Background technique [0002] The continuous expansion of regional power grid interconnection scale, large-scale grid connection of high-penetration renewable energy, and widespread application of power electronic equipment have not only enhanced the transmission capacity of the power system, improved the flexibility and economy of power system operation, but also brought power injection fluctuations. Problems such as randomness and randomness of power flow distribution have exacerbated the operation risk of the power system and brought unpredictable hidden dangers to the system voltage stability. [1]-[5] . Therefore, it is of great significance to study voltage stability under the background of high-penetration renewable energy grid connection a...
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IPC IPC(8): G06F30/20
CPCG06F30/20
Inventor 姜涛李雪张明宇陈厚合李国庆
Owner NORTHEAST DIANLI UNIVERSITY