Wide-area measurement information based power system voltage stability online evaluation method
A voltage stability and power system technology, applied in the evaluation field, can solve problems such as narrow application range, no consideration of load voltage characteristics, lack of accuracy and linearity of static voltage stability indicators, etc.
Active Publication Date: 2014-10-29
STATE GRID CORP OF CHINA +3
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Problems solved by technology
However, the existing static voltage stability index based on the feasible solution domain of the branch terminal voltage lacks good accuracy and linearity.
In addition, the derivation model of the static voltage stability index based on the feasible solution domain of the terminal voltage of the branch generally considers the load type as a constant power load, and does not consider the voltage characteristics of the load, so the scope of application is relatively narrow
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[0049] The present invention will be further described in detail below in conjunction with the drawings.
[0050] The present invention provides an online evaluation method of power system voltage stability based on wide-area measurement information. The method includes the following steps:
[0051] Step 1: Determine the online evaluation index of voltage stability;
[0052] The step 1 includes the following steps:
[0053] Step 1-1: Derive the branch quadratic equation about the branch end voltage from the branch voltage equation;
[0054] In the step 1-1, as figure 1 , For the Π-type branch, the branch voltage equation is expressed as:
[0055] U · i = U · j + I · ij ( R + jX ) - - - ( 1 )
[0056] among them, with Respectively are the voltage phasor unit values of the start node and the end node of the branch; Is the phasor per unit value of the current flowing from the start node to the end node of the branch; R and...
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The invention provides a wide-area measurement information based power system voltage stability online evaluation method. The wide-area measurement information based power system voltage stability online evaluation method comprises the following steps of determining voltage stability online evaluation indicators; validating the applicability of the voltage stability online evaluation indicators under a ZIP load model; performing online evaluation on the voltage stability of a power system according to the voltage stability online evaluation indicators. According to the wide-area measurement information based power system voltage stability online evaluation method, the voltage stability online evaluation is good in accuracy, linearity and computing rapidity, the method can be applied to the voltage stability online monitoring and evaluation, meanwhile the indicators are wide in applicability due to the fact that the voltage characteristics of loads are considered by the voltage stability indicators, and the method is simple, easy to execute and wide in application.
Description
Technical field [0001] The invention relates to an evaluation method, in particular to an online evaluation method of power system voltage stability based on wide-area measurement information. Background technique [0002] In order to meet the requirements of online applications, the voltage stability online indicators must have good accuracy, linearity and fast calculation. At present, the static voltage stability indicators commonly used in power systems such as sensitivity indicators, minimum eigenvalue indicators, and L indicators have linearity. Bad defects, and the amount of calculation will increase sharply with the increase of the system scale, which is not suitable for online applications. [0003] The static voltage stability index of the feasible solution domain usually uses the measurement information of the wide-area measurement system to obtain an index value that can reflect the voltage degree of the current state of the system through simple algebraic calculations, ...
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IPC IPC(8): H02J3/00G06F19/00
Inventor 蒲天骄于汀韩巍董雷张昭刘广一
Owner STATE GRID CORP OF CHINA