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A Judgment Method of Power System Stability Based on Single Infeed Generalized Operating Short-Circuit Ratio

A power system, short-circuit ratio technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problems of inability to apply power system stability monitoring, low support capacity, lack of economy, etc., and achieve real-time online evaluation of voltage support Ability, clear threshold, guaranteed economic effect

Active Publication Date: 2020-05-08
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, SCR is an empirical index that lacks reliable theoretical proof. According to experience, the critical short-circuit ratio is a range. Economical, if the supporting capacity is low, the stability will be lost
At the same time, SCR cannot be applied to real-time stability monitoring during the working process of the power system

Method used

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  • A Judgment Method of Power System Stability Based on Single Infeed Generalized Operating Short-Circuit Ratio
  • A Judgment Method of Power System Stability Based on Single Infeed Generalized Operating Short-Circuit Ratio
  • A Judgment Method of Power System Stability Based on Single Infeed Generalized Operating Short-Circuit Ratio

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Embodiment Construction

[0046] The present invention will be described in detail below with reference to the drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation mode and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0047] This embodiment provides a method for judging power system stability based on a single-infeed generalized operating short-circuit ratio, which is characterized in that the specific steps are:

[0048] Feed the generalized operating short-circuit ratio GOSCR model according to the power flow information input in the power system;

[0049] Determine whether the output value of the GOSCR model is 1;

[0050] If the value is greater than 1, the power system is in a stable state;

[0051] If the value is equal to 1, the power system is in a critical and stable state;

[0052] If the value is less tha...

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Abstract

The invention relates to a power system stability judging method based on single-feed generalized operation short-circuit ratio. The specific steps are as follows: according to the power flow information in the power system, the single-feed generalized operation short-circuit ratio GOSCR model is input; whether the output value of the GOSCR model is 1 is determined; If the value is greater than 1,the power system is in a stable state; If the value is equal to 1, the power system is in critical stable state. If the value is less than 1, the power system is unstable. Compared with the prior art, the invention can accurately design the critical strength required by the receiving AC system for the voltage support of the DC system, which can not only ensure the stability of the power system, but also ensure the economy without wasting the system resources.

Description

Technical field [0001] The invention relates to on-line monitoring and control of electric power systems, in particular to a method for judging the stability of electric power systems based on a single-infeed generalized operating short-circuit ratio. Background technique [0002] In the normal operation of the power system, as the DC transmission capacity gradually increases, the strength of the AC system at the receiving end is relatively weak; when the AC system has a short circuit and other faults, the DC system will be blocked, and power flow transfer will occur, resulting in the AC system at the sending end. Voltage instability occurs at the weak point, that is, the system loses stability. When the fault is removed, when the DC power is gradually restored, that is, when the system is stable, if the voltage support capacity of the receiving end AC system is insufficient at this time, and sufficient dynamic reactive power cannot be provided in time, it will cause oscillation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02J3/06
CPCH02J3/00H02J3/06H02J2203/20
Inventor 李东东孙梦显赵耀刘振宇高晓城杨帆林顺富
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER