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Whole-process voltage stability analysis fault screening method and system

A technology for voltage stability and fault screening, which is applied in AC network voltage adjustment, circuit devices, AC network circuits, etc.

Pending Publication Date: 2018-07-27
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, current domestic and foreign literature uses static analysis or transient analysis methods to screen and sort serious faults in voltage stability, and fails to fully consider the medium- and long-term voltage instability that may be caused by faults under the condition of including medium- and long-term dynamic components.

Method used

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  • Whole-process voltage stability analysis fault screening method and system
  • Whole-process voltage stability analysis fault screening method and system
  • Whole-process voltage stability analysis fault screening method and system

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Embodiment 1

[0097] Embodiment 1, the present invention provides a kind of fault screening method of whole process voltage stability analysis, such as figure 1 shown, including:

[0098] According to the obtained static power flow data of the power system, the serious fault set of static voltage stability is obtained;

[0099] Evaluating the static voltage stability severe fault set according to the obtained current operation mode, to obtain a transient voltage stability severe fault set;

[0100] The transient voltage stability severe fault set is evaluated to obtain a mid-long term voltage stable severe fault set.

Embodiment 2

[0101] Embodiment 2, the present invention provides a kind of fault screening system of whole process voltage stability analysis, comprising:

[0102] The static module is used to obtain static voltage stability serious fault sets according to the obtained static power flow data of the power system;

[0103] A transient module, configured to evaluate the static voltage stability severe fault set according to the obtained current operation mode, and obtain a transient voltage stable severe fault set;

[0104] The medium and long-term module is used to evaluate the transient voltage stability severe fault set to obtain the medium and long-term voltage stability severe fault set.

[0105] Further, the static module includes:

[0106] The power flow calculation sub-module is used to perform power flow calculation on the obtained static power flow data of the power system, and screen out overload faults;

[0107] The first power margin sub-module is used to calculate the power ma...

Embodiment 3

[0131] Embodiment 3, as figure 2 Shown is the flow chart of the screening and sorting method for severe faults in the whole process of voltage stability. Include the following steps:

[0132] Step 1: Static voltage stability evaluation, get the static serious fault set;

[0133] Step 2: Evaluate the transient voltage stability and obtain the transient severe fault set;

[0134] Step 3: Medium- and long-term voltage stability assessment, and medium- and long-term serious fault sets are obtained;

[0135] Step 4: Auxiliary decision-making for voltage instability faults.

[0136] Step 1 includes the following steps, such as image 3 Shown:

[0137] Step 1-1: Obtain the static power flow data of the current operation mode of the power system;

[0138] Step 1-2: Use the method of modifying the admittance matrix to quickly estimate the N-1 and N-2 interruption power flows, and screen out the faults that make the line current approach or exceed the rated value as overload faul...

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Abstract

The invention provides a whole-process voltage stability analysis fault screening method and system. The method comprises the steps of obtaining a static state voltage stability severe fault set according to an obtained power system static state power flow data; performing evaluation on the static state voltage stability severe fault set according to the obtained current operation mode to obtain atransient state voltage stability severe fault set; and performing evaluation on the transient state voltage stability severe fault set to obtain a medium and long term voltage stability severe faultset. By virtue of the method, voltage stability severe fault screening and sorting methods for the static state, transient state and medium and long term three analysis stages are provided, so that medium and long term dynamic simulation plays an important role in a fault scanning process, thereby avoiding scanning of a large number of fault sets in the medium and long term analysis for ensuringcalculation efficiency, and effectively screening out faults which cause medium and long term voltage instability.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to a fault screening method and system for voltage stability analysis in the whole process. Background technique [0002] In recent years, the power load of the receiving power grid has increased rapidly, and the construction of internal main power plants is insufficient. At the same time, the energy supply is far away from the load center, and a large amount of electric energy needs to be transmitted over long distances, resulting in increasingly prominent voltage stability problems. Scanning and evaluating the severity of faults is the basis for making auxiliary decisions and improving the stability of power systems. In a large-scale power system, the fault sets that need to be scanned are large, but the serious faults that may cause instability account for a small proportion. Therefore, it is necessary to screen and sort the fault sets, and select serious faults from a la...

Claims

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Application Information

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IPC IPC(8): H02J3/12H02J3/06
CPCH02J3/06H02J3/12H02J2203/20
Inventor 许鹏飞宋墩文仲悟之马世英陈勇宋新立杨学涛李铮杜三恩侯俊贤刘道伟许涛李海峰
Owner CHINA ELECTRIC POWER RES INST
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