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Multi-feed-in interaction factor calculation method considering direct-current control mode

A multi-feed interaction, DC control technology, applied in AC network circuits, power transmission AC networks, circuit devices, etc., can solve problems such as lack of predictability, analysis, large errors, etc., to achieve accurate calculation, high speed, and physical concepts. clear effect

Inactive Publication Date: 2018-06-29
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

However, the analytical formula of this method involves matrix inversion calculation, which is not intuitive to reflect the effect of each influencing factor on the MIIF value, and it is difficult to analyze each influencing factor of MIIF from the expression itself, but must be obtained through a large number of calculation results Changes of MIIF under certain conditions when influencing factors change
This makes the analysis of MIIF in this way inefficient and unpredictive
[0005] In order to facilitate the calculation and analysis of MIIF, scholars such as Denis LHA proposed another practical calculation method for MIIF, that is, the equivalent impedance ratio method. Fast calculation, but this method does not consider the influence of DC system control mode
This method can only be used to study the influence of equivalent AC system parameters on MIIF
Since the control method has a significant impact on the calculation results of MIIF, there is a large error in the calculation of this method

Method used

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Embodiment

[0046] This embodiment provides a method for calculating the multi-feed interaction factor taking into account the DC control method, the flow chart of the method is as follows figure 1 shown, including the following steps:

[0047] 1) Define the multi-infeed interaction factor MIIF between DC system i and DC system j considering the DC control mode ij as follows:

[0048] MIIF ij =k·MIIF' ij (1)

[0049] in,

[0050]

[0051]

[0052]

[0053] In the formula, MIIF' ij Indicates the multi-infeed interaction factor between DC system i and DC system j without considering the DC control mode, MIIF' ij The value is calculated by the formula (2), and k is the correction coefficient considering the DC control mode; Z ij is the mutual impedance amplitude of the commutation bus on DC system i and the commutation bus on DC system j; Z ii is the self-impedance amplitude of the commutation bus on DC system i, Z jj is the self-impedance amplitude of the commutation bus ...

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Abstract

The invention discloses a multi-feed-in interaction factor calculation method considering a direct-current control mode. The multi-feed-in interaction factor calculation method comprises the followingsteps: firstly defining a multi-feed-in interaction factor considering the direct-current control mode, deriving a correction coefficient of the multi-feed-in interaction factor by introducing the direct-current control mode in a traditional calculation formula of the multi-feed-in interaction influence factor without considering the direct-current system control mode, obtaining the correction coefficient by calculating the sensitivity of converter absorption reactive power to commutation bus voltage under different direct-current system control modes and obtaining a traditional multi-feed-ininteraction factor by calculating a system node impedance matrix. Therefore, the multi-feed-in interaction factor practical calculation method considering the direct-current control mode is finally given. By applying the method, factors affecting MIIF values can be conveniently subjected to quantitative analysis, and the defects that the conventional MIIF calculation method does not take the direct-current control mode into consideration, and the calculation and analysis efficiency is low are overcome.

Description

technical field [0001] The invention relates to the technical field of electric power systems and automation thereof, in particular to a calculation method for multi-feed interaction factors considering a direct current control mode. Background technique [0002] With the implementation of my country's "West-to-East Power Transmission" strategy, a large number of high-voltage direct current transmission projects have been put into operation in China, and a multi-circuit DC feed-in grid structure has been formed in load centers such as East China and South China. The mutual influence becomes more and more obvious. Studies have shown that the interaction between DC systems has a great influence on the steady-state and dynamic characteristics of the power system. Therefore, the study of this interaction is of great significance to the planning and operation of the power system. [0003] The CIGRE multi-infeed DC system research working group proposed a multi-infeed interaction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCH02J3/36H02J2203/20Y02E60/60
Inventor 夏成军王真华夏谢家正李成翔
Owner SOUTH CHINA UNIV OF TECH
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