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Fast search method of static voltage stability region boundary of electric system

A static voltage stability and power system technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of large conservatism, difficult universal conclusion, and large influence of SVSR boundary topology, and achieve calculation time The effect of reducing, high precision, and improving construction efficiency

Active Publication Date: 2017-09-05
NORTHEAST DIANLI UNIVERSITY
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Problems solved by technology

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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  • Fast search method of static voltage stability region boundary of electric system
  • Fast search method of static voltage stability region boundary of electric system
  • Fast search method of static voltage stability region boundary of electric system

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[0096] This example takes the search for the SVSR boundary of the WECC3-machine 9-node system as an example to verify the effectiveness of the fast search method for the static voltage stability region (SVSR) boundary. The WECC3-machine 9-node test system is as follows image 3 shown.

[0097] Load nodes 5 and 7 are selected as the key nodes for voltage stability, and the method of the present invention is used to search for the SVSR boundary in the two-dimensional active load space with active power injection at nodes 5 and 7 as the coordinate axis. like Figure 4 As shown, the ground state is used 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 the power increase is compensated by the generator where the balance node is located, where ΔS i is the complex power of node i, using CPF edge d 0 tracked Figure 4 In the initial SNB poin...

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Abstract

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 present invention relates to a static voltage stabilization domain boundary search problem. In particular, it relates to a fast search method for the boundary of the static voltage stability domain of a power system. Background technique [0002] The continuous expansion of regional grid interconnection, the large-scale grid connection of high-penetration renewable energy, and the wide application of power electronic equipment have enhanced the power transmission capacity of the power system, improved the operational flexibility and economy of the power system, and also brought about fluctuations in power injection. The problems such as the randomness of power flow and the randomness of power flow distribution have aggravated 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 the voltage stability in the context of high-penetrat...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 姜涛李雪张明宇陈厚合李国庆
Owner NORTHEAST DIANLI UNIVERSITY
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