A method for leveling the H-shaped bridge arm of a filter high-voltage capacitor

Abstract

The invention discloses a method for leveling H-type bridge arms of high-voltage capacitors of filters. The method comprises the steps of: obtaining a one-dimensional array, wherein the one-dimensional array indicates bottom-to-top sequence numbers of capacitor units in bridge arms according to a mounting position; obtaining a measured capacitance value of each capacitor unit and respectively calculating a high-voltage tower bridge arm unbalance degree, a low-voltage tower bridge arm unbalance degree and an H-type bridge arm unbalance degree fb of a capacitance value of each bridge arm beforeadjustment; setting a constraint condition to establish a mathematic model by taking the H-type bridge arm capacitance unbalance degrees fb as target functions and taking measured capacitance value ofthe bridge arms as variables; and obtaining to-be-adjusted capacitor position information and bridge arm unbalance degree minimum value according to the mathematic model. By utilizing the method, part reservation can be realized without changing capacitors, and only one pair or two pairs of existing capacitors are adjusted, so that the capacitor group bridge arm unbalance degree is decreased by more than 95% and the problem of too large initial unbalance current after commissioning is effectively restrained.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method for leveling the H-shaped bridge arm of a high-voltage capacitor of a filter. Background technique [0002] HVDC transmission has obvious advantages in long-distance and large-capacity transmission. The main function of the capacitor bank in HVDC transmission is to compensate reactive power and filter harmonics, and its safe operation directly affects the reliable transmission of DC power. With the continuous development of DC transmission in the direction of UHV and large capacity, the capacity of capacitor banks used in projects is also increasing. Capacitors are widely used in the AC and DC filters of converter stations, and the structure is dominated by symmetrical H-type bridges. The 800kV converter station is generally equipped with three types of AC filters, A, B, and C. Among them, the A and B type AC filters mainly filter out 12k±1 order harmonics, and...

AI Technical Summary

Problems solved by technology

This kind of problems: 1. It usually needs to be adjusted many times, or even replaced with new spare parts. The work efficiency is low and the consumption of spare parts is large; 2. The standard of leveling is not uniform, and the adjustment result is uncertain; 3. The bridge arm after adjustment is not The degree of balance is large, and the initial unbalanced current cannot be suppressed

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