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Real time evaluating method of voltage stability

A voltage stability, real-time data technology, applied in the measurement of current/voltage, AC network voltage adjustment, measurement of electricity and other directions, can solve problems such as large amount of calculation, how much stability margin, difficult to meet real-time monitoring, etc., to achieve good The effect of accuracy and linearity, wide applicability

Active Publication Date: 2009-01-21
CHINA ELECTRIC POWER RES INST +1
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AI Technical Summary

Problems solved by technology

In order to prevent voltage collapse accidents, dispatchers are most concerned about: how far is the current power system operating state from the collapse point or how much is the stability margin?
However, the calculation of this indicator is very large, and it is difficult to meet the requirements of real-time monitoring

Method used

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  • Real time evaluating method of voltage stability
  • Real time evaluating method of voltage stability
  • Real time evaluating method of voltage stability

Examples

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Embodiment Construction

[0095] Below is an embodiment of the inventive method, carries out simulation experiment with IEEE9 node system as embodiment, further explanation is as follows:

[0096] The real-time data collection of the power grid is simulated by the following method: slowly increase the load under the base load condition, and apply the PSD-BPA power flow program to repeatedly calculate the power flow, so as to obtain a series of system states (that is, each bus voltage phasor, each line active and reactive power) time Sequence; write these system state time series into files, and store the system state quantities in the real-time database by reading these files in the following applications, so as to simulate the real-time data acquisition process.

[0097] The specific implementation of the voltage stability real-time evaluation method proposed by the present invention comprises the following steps:

[0098] (1) Read system status real-time data and network parameters:

[0099] Read th...

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Abstract

The invention provides a circuit tidal current index for resolving the problems such as that the high circuit tidal current causes the voltage decrease at the bus of the receiving end and the failure about the real solution of the circuit tidal current equation. The circuit tidal current index is applied for real-time voltage stabilization detection to provide a voltage stability real-time evaluation method, based on the circuit tidal current index. The method can simply and quickly evaluate the voltage stability of a power network and can scan and calculate the circuit tidal current index of a full network line to fine the line of low voltage stability in the power network. Applied for the voltage stability real-time detection, the method can provide the change tread of the voltage stability of each line, to determine the initial point of the voltage stability problem.

Description

technical field [0001] The invention relates to a real-time evaluation method for voltage stability, which belongs to the field of power system analysis and control, and power system voltage stability real-time analysis and control. Background technique [0002] Voltage collapse accidents may occur in the main grid or in some regional grids. They are sudden and concealed, and are often difficult to detect clearly in the early stages of formation. This requires real-time and continuous monitoring of the operating status of the power system. At the same time, rapid data monitoring is required. Processing function and fast judgment function of system voltage stability, so as to find problems in time. The WAMS (Wide Area Measurements System) system, which has received widespread attention in recent years, can capture real-time steady-state and dynamic information of various locations in a large-scale interconnected power system under the same reference time frame, and has high a...

Claims

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Application Information

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IPC IPC(8): G01R31/00G01R19/00H02J3/00H02J3/16
CPCY02E40/34Y02E40/30
Inventor 马世英杜三恩印永华李柏青王英涛
Owner CHINA ELECTRIC POWER RES INST
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