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Evaluation method, system and device of multi-infeed direct current power system and storage medium

A multi-feed DC and power system technology, applied in the direction of AC network voltage adjustment, power transmission AC network, reactive power compensation, etc., can solve problems such as different reactive power sensitivity

Active Publication Date: 2019-08-30
GUANGDONG POWER GRID CO LTD +2
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Problems solved by technology

[0004] However, this calculation method regards the relationship between the voltage drop of the commutation busbar and the applied instantaneous reactive power change value as a linear relationship, that is, figure 1 shown
However, in practical applications, see figure 2 , the sensitivity of different converter bus voltages to reactive power is different

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  • Evaluation method, system and device of multi-infeed direct current power system and storage medium

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[0057] Further, the applicant considers that there are usually multiple AC lines connected to the AC side bus of the converter bus of the i-th inverter station. For the same fault type, if it occurs on different AC lines, the voltage drop of the converter bus will be There may be certain differences. In order to make the multi-feed DC interaction factor calculated in the subsequent steps more in line with the actual situation and facilitate evaluation, in a specific implementation manner of the present invention, step S302 can be specifically:

[0058] For each fault type, simulate the fault type on each AC line connected to the converter bus in the i-th inverter station in turn, record the maximum amplitude of each AC line in the process of voltage drop, and then The average amplitude is calculated from the recorded maximum amplitudes, and used as the determined voltage drop amplitude of the converter bus when the fault type occurs in the i-th inverter station.

[0059] Still...

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Abstract

The invention discloses an evaluation method of a multi-infeed direct current power system. The method comprises the steps of: obtaining fault types of a multi-infeed direct current power system and occurrence probability of each fault type; aiming at each fault type, determining the voltage drop amplitude of the ith inverter station when the ith inverter station generates the fault type; applyingreactive power impacts with different sizes to the ith inverter station to fit K voltage drop amplitude-reactive power impact value curves; and multiplying the occurrence probability of each fault type by the corresponding action parameter, performing summing, and taking the result after summing as MIIF (Multi-infeed Interaction Factor) j, i of the ith inverter station to the jth inverter stationso as to perform multi-infeed direct current power system evaluation based on the MIIFj, i. By applying the scheme of the invention, the calculated MIIFj, i can better reflect the voltage drop causedby the fault in the practical application, thereby facilitating evaluation of the multi-infeed direct current power system more accurately. The invention further provides an evaluation system and device of a multi-infeed direct current power system, and a storage medium which have the corresponding effects.

Description

technical field [0001] The present invention relates to the technical field of power systems, in particular to an evaluation method, system, equipment and storage medium for a multi-infeed DC power system. Background technique [0002] In the transmission system, when the electrical distance between the DC inverter stations is relatively close, the DC systems are coupled with each other, and the mutual influence between multiple DC circuits is relatively high. For example, DC near-field faults may cause the voltage drop of multiple commutation busbars, causing multiple DC commutation failures, and even lead to system instability in severe cases. [0003] In order to evaluate the multi-infeed DC power system, the CIGRE WG B4-41 working group proposed MIIF (Multi-infeed Interaction Factor, multi-infeed DC interaction factor). Specifically, when the investigated DC power system operates at rated DC power, a parallel reactive power branch is put into the commutation bus of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/16
CPCH02J3/16H02J3/36Y02E40/30Y02E60/60
Inventor 徐蔚蔡万通金楚姚文峰杨燕郭知非李作红张蓓彭勃
Owner GUANGDONG POWER GRID CO LTD
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