A method for balancing the capacitance of capacitor units used in UHVDC transmission projects

Abstract

The invention discloses a method for balancing the capacitance of capacitor units used in UHV DC transmission projects, adopting reasonable capacitance balance and temperature correction methods, using equipment to perform positioning of capacitor units, measurement and transmission of capacitance values, as well as balancing and leveling, and finally obtains Good trim results. During the whole process, there is no need to manually copy the capacitor number and capacitance value, which greatly avoids the hidden danger of manual error.

Description

technical field [0001] The invention relates to the field of high-voltage electronics, in particular to a method for balancing capacitor units used in UHV DC transmission projects. Background technique [0002] The capacitance value of the capacitor bank used in the UHV DC transmission project is composed of several capacitor unit capacitance values ​​through different series and parallel connections, such as figure 1 Connection shown. The capacitance deviation of the whole group is required to be within ±1%, and the capacitance deviation between the arms of each arm is required to be within 0.05%. Due to the high capacitance deviation requirements and the huge number of capacitor units (up to tens of thousands) in the UHV DC transmission project, usually In any case, it is necessary to theoretically balance the capacitance of the capacitor unit within the company, install the capacitor unit on the corresponding position of the frame according to the balance table, and then ...

AI Technical Summary

Problems solved by technology

[0004] 1. Directly use the capacitance of the capacitor unit in a certain period of time for trimming, without considering the influence of temperature, and without temperature correction for the capacitance

Capacitance will change due to changes in temperature. At different temperatures, the capacitance of the same capacitor unit will be different. If the capacitance change caused by temperature is not considered, the theoretical capacitance deviation of the capacitor bank and the capacitance between the arms after trimming The deviation seems to meet the requirements, but in fact all the capacitor units are in the same environment and at the same temperature, the measured capacitance of the capacitor bank is definitely different from the theoretical calculation, and even does not meet the requirements

[0005] 2. Manually transcribing capacitor unit numbers and capacitance values ​​is usually used. When there are a large number of capacitor units, there will often be problems such as repeated capacitor unit numbers and wrong copying of capacitance values, which will affect the balance result.

Manually transcribing capacitor unit numbers and capacitance values ​​requires two people to cooperate, one person is responsible for reporting the number or measuring the capacitance value, and the other is responsible for recording, which causes a lot of waste of human resources

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