特高壓換流變壓器諧波損耗測量分析與模型研究
發(fā)布時間：2018-07-31 08:39
【摘要】：由于我國電力負荷與資源的分布不均,特高壓直流輸電技術得到了較快的發(fā)展。隨著我國特高壓骨干電網的建設,特高壓換流變壓器作為連接交流系統(tǒng)和直流系統(tǒng)的關鍵設備,受到廣泛的關注。尤其是特高壓直流換流站通常工作在雙12脈動條件下,由換流器產生大量諧波流過換流變壓器繞組,由此產生了巨大的諧波損耗,嚴重影響換流變壓器的溫升及負載能力,據統(tǒng)計換流變壓器的負載損耗約占換流站總損耗的35%～50%。本文針對目前特高壓換流變壓器損耗測量困難的問題,通過研究提出一種適用特高壓換流變壓器諧波損耗測量系統(tǒng),采用大功率諧波電流源提供諧波電流,測量用諧波電流達到諧波電流額定量的10%～50%,能夠準確測量換流變壓器諧波損耗頻率特性,對換流變壓器運行維護以及今后設計、制造的改進具有重要的指導意義。本文主要研究內容包括：(1)考慮到特高壓換流變壓器諧波損耗測量困難,以目前采用的IEC 61378-2法作為研究對象,通過分析換流變壓器特點及運行工況,對諧波損耗進行了理論解析,分析了諧波損耗不同組成部分與頻率的關系,進行相關仿真、實驗工作后提出了換流變壓器諧波損耗計算模型的修正方案。(2)在上述工作的基礎上,提出了換流變壓器諧波損耗測量系統(tǒng)方案,通過研制縮小比例的換流變壓器,對縮小比例的換流變壓器進行諧波損耗測量驗證了測量方法的有效性、可行性并完善測量系統(tǒng)方案,通過縮小比例的換流變壓器諧波損耗測量對計算方法進行校核。最終完成了適用于實際換流變壓器諧波損耗測量分析的測量系統(tǒng)。(3)針對換流變壓器現(xiàn)場諧波損耗測量環(huán)境,提出具體實驗方案,采用目前常用的IEC 61378-2法和本文提出的方法分別對換流變壓器進行了現(xiàn)場諧波損耗測量,完成數據的對比分析工作,進一步完善換流變壓器諧波損耗計算模型。采用修正后的計算模型對換流變壓器諧波損耗進行解耦分析,得到各次諧波下繞組及連接件的渦流損耗和箱體及結構件的雜散損耗值,結合現(xiàn)有文獻中的仿真分析,驗證了修正計算模型的準確性與通用性。
[Abstract]:Due to the uneven distribution of power load and resources in China, UHVDC technology has been developed rapidly. With the construction of UHV backbone power grid in China, UHV converter transformer, as the key equipment to connect AC system and DC system, has received extensive attention. Especially, the UHV DC converter station usually works under the condition of double 12 pulsation, and a large number of harmonics flow through the transformer windings by the converter, which results in a huge harmonic loss, which seriously affects the temperature rise and load capacity of the converter transformer. According to statistics, the load loss of converter transformer accounts for 35% of the total loss of converter station. In this paper, aiming at the difficulty of measuring the loss of UHV converter transformer at present, a new harmonic loss measurement system for UHV converter transformer is proposed, which uses high power harmonic current source to provide harmonic current. The harmonic current can be used to measure the harmonic loss frequency characteristics of converter transformers accurately, which is of great significance to the operation and maintenance of converter transformers as well as the improvement of design and manufacture in the future. The main contents of this paper are as follows: (1) considering the difficulty of measuring harmonic loss of UHV converter transformer, the IEC 61378-2 method is taken as the research object, and the characteristics and operating conditions of converter transformer are analyzed. The harmonic loss is analyzed theoretically, the relationship between the different components of harmonic loss and frequency is analyzed, and the simulation is carried out. After the experiment work, a revised scheme for calculating harmonic loss model of converter transformer is proposed. (2) based on the above work, A scheme of harmonic loss measurement system for converter transformer is proposed. The effectiveness of the measurement method is verified by measuring harmonic loss of converter transformer with reduced proportion. The feasibility and the scheme of measurement system are improved, and the calculation method is checked by reducing the proportion of harmonic loss measurement of converter transformer. Finally, the measurement system suitable for the measurement and analysis of harmonic loss of actual converter transformer is completed. (3) aiming at the field harmonic loss measurement environment of converter transformer, a concrete experimental scheme is put forward. The harmonic loss of converter transformer is measured by using the IEC 61378-2 method and the method proposed in this paper. The comparison and analysis of the data are completed and the calculation model of harmonic loss of converter transformer is further improved. The harmonic loss of converter transformer is decoupled by using the modified calculation model. The eddy current loss of winding and connectors under each harmonic wave and the stray loss of box and structure are obtained, and the simulation analysis is combined with the existing literature. The accuracy and generality of the modified model are verified.
【學位授予單位】：華北電力大學(北京)
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TM41
[Abstract]:Due to the uneven distribution of power load and resources in China, UHVDC technology has been developed rapidly. With the construction of UHV backbone power grid in China, UHV converter transformer, as the key equipment to connect AC system and DC system, has received extensive attention. Especially, the UHV DC converter station usually works under the condition of double 12 pulsation, and a large number of harmonics flow through the transformer windings by the converter, which results in a huge harmonic loss, which seriously affects the temperature rise and load capacity of the converter transformer. According to statistics, the load loss of converter transformer accounts for 35% of the total loss of converter station. In this paper, aiming at the difficulty of measuring the loss of UHV converter transformer at present, a new harmonic loss measurement system for UHV converter transformer is proposed, which uses high power harmonic current source to provide harmonic current. The harmonic current can be used to measure the harmonic loss frequency characteristics of converter transformers accurately, which is of great significance to the operation and maintenance of converter transformers as well as the improvement of design and manufacture in the future. The main contents of this paper are as follows: (1) considering the difficulty of measuring harmonic loss of UHV converter transformer, the IEC 61378-2 method is taken as the research object, and the characteristics and operating conditions of converter transformer are analyzed. The harmonic loss is analyzed theoretically, the relationship between the different components of harmonic loss and frequency is analyzed, and the simulation is carried out. After the experiment work, a revised scheme for calculating harmonic loss model of converter transformer is proposed. (2) based on the above work, A scheme of harmonic loss measurement system for converter transformer is proposed. The effectiveness of the measurement method is verified by measuring harmonic loss of converter transformer with reduced proportion. The feasibility and the scheme of measurement system are improved, and the calculation method is checked by reducing the proportion of harmonic loss measurement of converter transformer. Finally, the measurement system suitable for the measurement and analysis of harmonic loss of actual converter transformer is completed. (3) aiming at the field harmonic loss measurement environment of converter transformer, a concrete experimental scheme is put forward. The harmonic loss of converter transformer is measured by using the IEC 61378-2 method and the method proposed in this paper. The comparison and analysis of the data are completed and the calculation model of harmonic loss of converter transformer is further improved. The harmonic loss of converter transformer is decoupled by using the modified calculation model. The eddy current loss of winding and connectors under each harmonic wave and the stray loss of box and structure are obtained, and the simulation analysis is combined with the existing literature. The accuracy and generality of the modified model are verified.
【學位授予單位】：華北電力大學(北京)
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TM41
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