Evaluation method and system for short-term voltage stability of power grid

A voltage stabilization and grid voltage technology, applied in the grid short-term voltage stability evaluation method and system field, can solve the problems of reducing the grid voltage safety margin, grid collapse, and limited shock resistance, and achieve rapid assessment and margin calculation, and strengthen online The effect of monitoring

Pending Publication Date: 2019-07-09
STATE GRID HENAN ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

More and more large-scale centralized access to the transmission network is adopted, which makes the impact of wind power on the power grid continue to increase, and the ability to withstand shocks is limited
On the one hand, when the terminal voltage is too low, the unit will actively cut off for its own safety, which will cause the system to suddenly lose power and cause system instability; on the other hand, if the output is too high, the voltage safety margin of the grid may be reduced, which is easy lead to voltage collapse
[0004] The existing technology adopts the medium and long-term voltage stability assessment method, and the online calculation period is long, which causes the grid voltage to fluctuate, which cannot be detected in time, leading to the collapse of the grid

Method used

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  • Evaluation method and system for short-term voltage stability of power grid
  • Evaluation method and system for short-term voltage stability of power grid
  • Evaluation method and system for short-term voltage stability of power grid

Examples

Experimental program
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Effect test

Embodiment 1

[0057]Step 1: When the grid operating state monitored by the grid relay in real time fails, the monitoring bus voltage, load bus current and real-time relative power angle detected by the grid PMU measurement in real time are brought into the pre-built real-time grid parameter identification equation for calculation. , get the load margin;

[0058] Step 2: If the load margin is greater than the preset short-term voltage stability value, the grid voltage is in a stable state; otherwise, the grid voltage is in a collapsed state.

[0059] The real-time power grid parameter identification equation is constructed from the real-time relative power angle curve determined by the power grid PMU measurement.

[0060] The purpose of the present invention is to propose a short-term voltage stability evaluation method of power grid based on PMU measurement.

[0061] Step 1: When the grid operating state monitored by the grid relay in real time fails, the monitoring bus voltage, load bus c...

Embodiment 2

[0084] Based on the same inventive concept, the present invention also provides a short-term voltage stability evaluation system for a power grid, the system comprising:

[0085] Calculation module: It is used to bring the monitoring bus voltage, load bus current and real-time relative power angle detected by the grid PMU measurement real-time grid PMU measurement into the pre-built real-time The power grid parameter identification equation is calculated, and the load margin is obtained;

[0086] Evaluation module: used for if the load margin is greater than the preset short-term voltage stability value, the grid voltage is in a stable state, otherwise the grid voltage is in a collapsed state;

[0087] The real-time power grid parameter identification equation is constructed from the real-time relative power angle curve determined by the power grid PMU measurement.

[0088] The computing module also includes: a building module;

[0089] The building module is used to obtain ...

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PUM

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Abstract

The invention provides an evaluation method and system for short-term voltage stability of a power grid. When a power grid operation state monitored in real time by a power grid relay breaks down, a monitoring bus voltage, a load bus current and a real-time relative power angle detected in real time by PMU measurement of the power grid are substituted into a real-time power grid parameter identification equation which is built in advance, and calculation is carried out to obtain load margin; if the load margin is larger than a preset short-term voltage stability value, a voltage of the power grid is in a stable state, otherwise, the voltage of the power grid is in a breakdown state; and the PMU measurement achieves rapid evaluation and margin calculation of the short-term voltage stabilityof the power grid, and enhances on-line monitoring of a short-term voltage stability point by the power grid.

Description

technical field [0001] The invention relates to the technical field of power system security and control, in particular to a method and system for short-term voltage stability evaluation of a power grid. Background technique [0002] Day-ahead early-warning evaluation of power grid operation mode is one of the important daily tasks in the field of power system production. However, day-ahead early-warning evaluation only through power grid simulation calculation often assumes that there is no comprehensive abnormal disturbance caused by rotating equipment such as generators or induction motor loads in the power grid. The early-warning evaluation of the grid operation mode, which takes into account the abnormal disturbance probability of historical grid nodes, can effectively reduce the risk of grid operation to a certain extent. [0003] With the continuous progress of modern power generation technology, the unit capacity of the unit is increasing. With the increasing adopti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20Y04S10/22Y02E40/70Y02E60/00
Inventor 代飞熊浩清张毅明安军赵娟刘轶夏天镐俊杰郭庆来陈上吉熊化化葛怀畅饶宇飞高昆汤磊
Owner STATE GRID HENAN ELECTRIC POWER
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