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A Construction Method of Simplified Model of Power Impulse Under DC Fault

A DC fault, simplified model technology, applied in the direction of power transmission and AC network, can solve the problems of inverter commutation failure, blocking, inverter commutation failure, etc., to achieve the effect of simple and practical model

Active Publication Date: 2020-05-22
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the AC-DC interconnected power grid, a short-circuit fault in the AC system may cause the commutation failure of the inverter station. If the abnormal factors are not cleared in time, the continuous commutation failure of the converter in the inverter station may even be blocked.

Method used

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  • A Construction Method of Simplified Model of Power Impulse Under DC Fault
  • A Construction Method of Simplified Model of Power Impulse Under DC Fault
  • A Construction Method of Simplified Model of Power Impulse Under DC Fault

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0042] Such as figure 1 As shown, a method for constructing a simplified model of power impact under DC faults includes the following steps:

[0043] Step 1. Obtain the measured data of the output power of the DC system when a DC fault occurs; now the common DC systems in my country are generally bipolar operation, and it is necessary to obtain the measured data of the output power of the two poles (ie active power data).

[0044] Step 2, draw a power curve based on the measured data, and judge the fault according to the curve.

[0045] Faults include one commutation failure in the DC system, multiple commutation failures in the DC system, a blocking fault in one pole of the DC system without ...

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Abstract

The invention discloses a construction method of a power impact simplified model under a direct current fault. The construction method comprises the steps of 1, obtaining the actually measured data ofthe output power of a direct current system when a direct current fault occurs; 2, judging a fault according to the actually measured data; and 3, establishing the model. Specific to complexity and diversity of a power fluctuation process under the direct current fault, the power impact simplified model under the direct current fault is established by virtue of summary of power impact forms underdifferent faults; the model remains the power impact key characteristic under the direct current fault; and meanwhile, the model is simple and practical, and can be applied to simulation study of call wire power oscillation of an alternating direct current power grid.

Description

technical field [0001] The invention relates to a method for constructing a simplified power impact model under DC faults, and belongs to the technical field of modeling. Background technique [0002] my country is the country with the largest DC transmission scale in the world. There are currently 22 DC systems in operation. With the increase of DC systems, DC system failures occur frequently, and simultaneous failures of multiple DC systems in areas where multiple DC feeds are placed also occur from time to time. In the AC-DC interconnected grid, a short-circuit fault in the AC system may cause commutation failure in the inverter station. If the abnormal factors are not cleared in time, the converter in the inverter station will fail to commutate continuously or even be blocked. The transmission capacity of the DC system is larger, and the power impact of large capacity has a great impact on the power oscillation of the tie line of the AC system. Therefore, it is necessar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 赵健鞠平杨阳苏玮奕彭琰陈彦翔余一平陈谦臧晓明秦川金宇清
Owner HOHAI UNIV
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