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Rapid sensitivity analysis method for ring grid line current out-of-limit

A technology of sensitivity analysis and line current, applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve the problems of poor real-time performance and large amount of calculation, so as to improve the control ability, improve the control ability, and improve the processing efficiency. Effect

Inactive Publication Date: 2015-03-18
STATE GRID CORP OF CHINA +2
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Problems solved by technology

The existing sensitivity analysis and calculation methods mainly study the sensitivity relationship between the line and the injectable load node, without linkage with the limit alarm, and there are weaknesses such as large amount of calculation and poor real-time performance

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  • Rapid sensitivity analysis method for ring grid line current out-of-limit

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Embodiment Construction

[0020] The technical solutions of the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] Before introducing the embodiments of the present application in detail, the individual concepts involved in the present application are briefly introduced:

[0022] (1) SCADA: SCADA (Supervisory Control And Data Acquisition) system, that is, data acquisition and monitoring control system. The application field of SCADA system is very wide, it can be used in power system, water supply system, petroleum, chemical industry and other fields of data acquisition and monitoring control and process control and many other fields. It is also called telecontrol system in power system and electrified railway. SCADA system is a computer-based production process control and scheduling automation system. It can monitor and control the operating equipment on site to realize various functions such as data acquisition, equipment control, meas...

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Abstract

A rapid sensitivity analysis method for ring grid line current out-of-limit relates to a line sensitivity analysis method. A conventional out-of-limit elimination algorithm mainly comprises an optimization method and a sensitivity method, which are low in calculating efficiency and poor in real-time performance. The rapid sensitivity analysis method is characterized in that the method comprises the following steps: 1) capturing an out-of-limit warning signal; 2) analyzing whether an out-of-limit branch is a ring grid branch; 3) calculating sensitivity relationship between the out-of-limit branch and load nodes as well as between the out-of-limit branch and generator nodes, for each out-of-limit branch, scanning braches of the same supply area and branches of adjacent supply areas by utilizing a local scanning algorithm, analyzing and calculating sensitivity by adopting a DC current on-off method, and carrying out correction on a Jakob matrix directly to obtain a linear relationship between independent variables and dependent variables; and 4) ranking the load nodes and the generator nodes according to the sensitivity, and giving an output improving and load reducing suggestion according to the sensitivity index. According to the technical scheme, processing efficiency is effectively improved, and real-time performance is improved.

Description

technical field [0001] The invention relates to a method for line sensitivity analysis, and belongs to the technical field of power system analysis. Background technique [0002] When the power grid fails, the faulty equipment will be out of operation due to the switching action, and the normal equipment will carry the full load, which may cause the power flow to exceed the limit. , it is necessary to eliminate the over-limit of the branch power flow in time, and the dispatcher is required to take effective measures to eliminate the over-limit, and obtain the best effect with the least adjustment means. For a divergent power grid, the measures for reducing the power flow are relatively simple, and can be realized by load shedding and output lift; for a ring power grid, the elimination of current over-limits in the case of a ring network is nonlinear, and the elimination of over-limits is more complicated. The empirically obtained measures may not satisfy the power flow cons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 杨滢张静蒋正威饶明军毛以军郑翔江雯姬
Owner STATE GRID CORP OF CHINA
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