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Multi-infeed direct current mutual influence evaluation method and system considering direct current change domain

A multi-feed DC and DC current technology, applied in the electrical field, can solve the problems of fast dynamic response characteristics, influence of commutation bus voltage, lack of reactive power, etc.

Pending Publication Date: 2021-02-12
STATE GRID ECONOMIC TECH RES INST CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the fast dynamic response characteristics of the DC transmission system, the DC current on the DC transmission line will have an increase in the electromagnetic time scale during the time period after the commutation bus voltage drops due to the disturbance of the AC system and before the constant current controller acts. In the large process, the power factor of the converter decreases during this process, and the reactive power demand of the inverter is greater than the reactive power provided by the compensation equipment. The voltage at the

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  • Multi-infeed direct current mutual influence evaluation method and system considering direct current change domain

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Embodiment 1

[0046] This embodiment discloses a multi-infeed direct current mutual influence evaluation method considering the direct current change domain, including:

[0047] Considering the fast dynamic characteristics of the DC system, the DC current on the DC line will have an increasing process on the electromagnetic time scale after the voltage at the commutation bus changes due to the disturbance and before the constant current controller operates, so it is necessary to determine the rectification side DC current variation domain before constant current controller action;

[0048] Calculate the voltage variation at the commutation bus using the obtained DC current variation domain;

[0049]Calculate the ratio of the voltage variation of each commutation bus using the obtained voltage variation of the commutation bus to obtain the value of the multi-feed voltage interaction factor;

[0050] By using the value of multi-infeed voltage interaction factor, the mutual influence between ...

Embodiment 2

[0105] The purpose of this embodiment is to provide a computing device, which includes a memory, a processor, and a computer program stored in the memory and operable on the processor. The specific steps of the method described above.

Embodiment 3

[0107] The purpose of this embodiment is to provide a computer-readable storage medium.

[0108] A computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the specific steps of the method in the first embodiment above are executed.

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Abstract

The invention provides a multi-infeed direct current mutual influence evaluation method considering a direct current change domain. The method comprises the steps of determining the direct current change domain before a rectification side constant current controller acts; calculating the voltage variation at the current conversion bus by utilizing the solved direct current variation domain; calculating the ratio of the voltage variation of each converter bus by using the obtained voltage variation of each converter bus to obtain the value of a multi-infeed voltage interaction factor; and solving the value of the multi-infeed voltage interaction factor to measure the mutual influence among the direct current systems of the receiving-end power grid. An analysis result shows that when the multi-infeed interaction factor is calculated, a calculation result of a direct current change domain caused by disturbance is closer to a time domain simulation result.

Description

technical field [0001] The present disclosure belongs to the field of electrical technology, and in particular relates to a multi-feed direct current mutual influence evaluation method and system taking into account the direct current variation domain. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] As the grid structure of the UHV power grid continues to strengthen, if the UHV power grid still operates in parallel with the 500kV system grid, the 500kV system will have problems such as excessive short-circuit current levels. Therefore, the 500kV system needs to be partitioned and decoupled. However, the receiving-end system has formed a multi-DC feed-in system. When performing partition decoupling, DC systems with large mutual influence should be avoided from being divided into the same partition, so as to reduce the impact of mutual infl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20
CPCG06F30/20
Inventor 刘栋张静怡顾盼张艳宋凯歌
Owner STATE GRID ECONOMIC TECH RES INST CO