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A comprehensive evaluation method for power system reactive power reserve based on eigenvalue analysis

A technology of eigenvalue analysis and power system, applied in data processing applications, instruments, calculations, etc., can solve problems such as no solution, and achieve the effect of small amount of calculation

Active Publication Date: 2018-08-31
NARI TECH CO LTD +2
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Problems solved by technology

However, how to use these eigenvalues ​​to reflect the comprehensive impact of nodal reactive power injection on the static voltage stability of the power system under the grid operation mode, so as to achieve a comprehensive evaluation of the effectiveness of nodal reactive power backup in maintaining voltage control capabilities, and then evaluate The overall level of power system reactive power reserve, there is still no relevant solution

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  • A comprehensive evaluation method for power system reactive power reserve based on eigenvalue analysis
  • A comprehensive evaluation method for power system reactive power reserve based on eigenvalue analysis
  • A comprehensive evaluation method for power system reactive power reserve based on eigenvalue analysis

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Embodiment Construction

[0033] The present invention will be described in further detail below with reference to the accompanying drawings.

[0034] figure 1 Step 1 describes that, firstly, by linearizing the power flow equation of the power system operation mode, the power system steady-state node active / reactive power injection micro-increment and node voltage amplitude / The associated equations of the phase angle micro-increment, and then through the assumption of formula (2), get the associated equations of the power system steady-state node reactive power injection micro-increment and voltage amplitude micro-increment represented by formula (3), Go to step 2;

[0035]

[0036] ΔP=0 (2)

[0037]

[0038] In the formula, ΔP is the micro-increment of node active power injection, ΔQ is the micro-increment of node reactive power injection, Δθ is the micro-increment of node voltage phase angle, and ΔV is the micro-increment of node voltage amplitude; J Pθ 、J PV 、J Qθ and J QV Submatrix of th...

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Abstract

The invention discloses a method for evaluating reactive power reserves of an electric power system from the point of view of steady-state voltage stability, and belongs to the technical field of electric power system dispatching and operating. The method disclosed by the invention aims at carrying out eigenvalue analysis on a flow Jacobian matrix for steady-state voltage stability analysis, an eigenvalue whose ratio with the minimum eigenvalue is small is taken as a key eigenvalue, the comprehensive influence degree of node reactive power reserves for the steady-state voltage stability is reflected by the comprehensive sensitivity of node reactive injection for all of the eigenvalues, a low-voltage safe and stable reactive power reserve is differentiated from a high-voltage safe and stable reactive power reserve, and the sum of static reactive power reserves and the sum of dynamic reactive power reserves of each node which takes the comprehensive sensitivity as a weight are further weighted and accumulated, thereby acting as a low-voltage safe and stable reactive power reserve comprehensive index and a high-voltage safe and stable reactive power reserve comprehensive index. The comprehensive evaluation method provides a technical means for monitoring variations in reactive power reserves of the electric power system and comparing the effective degrees of the reactive power reserves under different operating modes by the dispatching and operating personnel.

Description

technical field [0001] The invention belongs to the technical field of power system dispatching operation, and more precisely, the invention relates to a method suitable for comprehensively evaluating reactive power reserve of a power system under a certain operation mode. Background technique [0002] The safe operation of the power system needs to consider the ability to withstand fluctuations in load and new energy generation. Usually, it is clearly required in the technical guidelines or regulations for power system operation that there must be a certain proportion of active power spinning reserve in the operation of the power system, generally not more than 2%~ 5% of the actual load determines the active power spinning reserve, but the reactive power reserve (standby) is only required, but there is no clear definition and calculation method. Existing methods for calculating reactive power reserve are all realized by calculating the Q-V curve based on the continuous powe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06Q50/06
Inventor 徐泰山鲍颜红薛禹胜徐伟彭慧敏李峰周海锋刘韶峰杨君军
Owner NARI TECH CO LTD
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