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Transient stability risk assessment method for AC/DC system

A technology for grid transient stability and risk assessment, which is used in power transmission AC networks, instruments, data processing applications, etc.

Active Publication Date: 2019-03-26
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem of transient stability risk assessment of the AC / DC hybrid system under large disturbances, which is different from the traditional purely physical mechanism modeling method, which is based on the combination of data modeling and physical modeling The idea is to use the grid-like simulation big data and the continuous online growth of field fault data to construct the fault set of AC and DC response mechanism, and based on this data set, the expected response of the AC system under the instantaneous power shortage of the DC system caused by specific AC disturbances can be obtained , and based on the mathematical equivalent model of the DC converter station, a fast and parallel electrical quantity analysis calculation is performed on several AC expected responses, so that the corresponding AC-DC system transient stability risk index is calculated according to the analytical solution of each electrical quantity

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  • Transient stability risk assessment method for AC/DC system
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  • Transient stability risk assessment method for AC/DC system

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Embodiment 1

[0099] A method for assessing the transient stability risk of an AC / DC system based on a fault set and an equivalent model of a DC converter station, comprising the following steps:

[0100] Step 1: Construct the fault set X of the AC / DC hybrid grid all , the fault set data includes offline simulation data X sim and real wave data X hist ;

[0101] Among them, the offline simulation data refers to the terabyte-level operation data obtained by performing grid-type electromagnetic transient simulation on the AC-DC hybrid network and recording the response of the AC-DC system under various disturbance scenarios.

[0102] The real wave recording data refers to the real wave recording data obtained during the operation of the AC / DC hybrid power grid.

[0103] Step 2: For the fault set X of the AC / DC hybrid power grid constructed in step 1 all The data is analyzed, and the fault capacity △P equivalent to the AC fault is calibrated for each fault scenario, that is, the disturbanc...

Embodiment 2

[0135] Embodiment 2: A method for assessing the transient stability risk of an AC / DC system based on a fault set and an equivalent model of a DC converter station, comprising the following steps:

[0136] Step 1: Construct the fault set X of the AC / DC hybrid grid all , the fault set data includes offline simulation data X sim and real wave data X hist ;

[0137] Among them, the offline simulation data refers to the terabyte-level operation data obtained by performing grid-type electromagnetic transient simulation on the AC-DC hybrid network and recording the response of the AC-DC system under various disturbance scenarios.

[0138] The real wave recording data refers to the real wave recording data obtained during the operation of the AC / DC hybrid power grid.

[0139] Step 2: For the fault set X of the AC / DC hybrid power grid constructed in step 1 all The data is analyzed, and the fault capacity △P equivalent to the AC fault is calibrated for each fault scenario, that is, ...

Embodiment 3

[0173] A method for assessing the transient stability risk of an AC / DC system based on a fault set and an equivalent model of a DC converter station, comprising the following steps:

[0174] Step 1: Construct the fault set X of the AC / DC hybrid grid all , the fault set data includes offline simulation data X sim and real wave data X hist ;

[0175] Among them, the offline simulation data refers to the terabyte-level operation data obtained by performing grid-type electromagnetic transient simulation on the AC-DC hybrid network and recording the response of the AC-DC system under various disturbance scenarios.

[0176] The real wave recording data refers to the real wave recording data obtained during the operation of the AC / DC hybrid power grid.

[0177] Step 2: For the fault set X of the AC / DC hybrid power grid constructed in step 1 all The data is analyzed, and the fault capacity △P equivalent to the AC fault is calibrated for each fault scenario, that is, the disturbanc...

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Abstract

The invention discloses a transient stability risk assessment method for an AC / DC system, and belongs to the intersection field of the field of relay protection of a power transmission line and the artificial intelligence field. The invention adopts the real-time measurement information in the large disturbance state of a DC control system to perform the parallel analytical evaluation of a fast hypothetical fault set, so as to obtain the continuous commutation failure risk estimation value of the perturbation based on the hypothetical fault set. The method proposed by the invention can quicklyevaluate the risk of continuous commutation failure of a DC transmission system based on the measurement information after the occurrence of AC disturbance, overcome the problem that the operation risk of the DC transmission system is difficult to evaluate. Based on the analytical equivalent model of a DC converter station and parallel computing, the computational speed of engineering field applications is accelerated. The transient stability risk assessment method has broad engineering application prospect.

Description

technical field [0001] The invention belongs to the technical field of power system stability control, relates to the intersection of power system transmission line relay protection and artificial intelligence, and particularly relates to a method for evaluating the risk of a DC system operating state in an AC-DC hybrid system. Background technique [0002] With the rapid development of DC transmission technology in my country, my country has formed the world's largest AC-DC hybrid transmission system with the highest voltage level. The converter valve of LCC-HVDC (high-voltage direct current transmission based on grid commutation rectifier) ​​is generally a thyristor, which brings strong nonlinearity to the AC-DC hybrid system due to the continuous change of the on-off state of the valve during operation. In addition, there are many control systems in the DC system, and the strong coupling of the AC and DC systems has brought many difficulties to the analysis of the interac...

Claims

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Application Information

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IPC IPC(8): H02J3/36G06Q10/06G06Q50/06
CPCG06Q10/0635G06Q50/06H02J3/36Y02E60/60
Inventor 张国辉李志中刘萌苏建军王宾张天宝黄秉青张婉婕史方芳杨超李宽赵斌超王永波李聪聪梁正堂石硕李娜佟新元
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY