特高压换流变压器谐波损耗测量分析与模型研究
发布时间：2018-07-31 08:39
【摘要】：由于我国电力负荷与资源的分布不均,特高压直流输电技术得到了较快的发展。随着我国特高压骨干电网的建设,特高压换流变压器作为连接交流系统和直流系统的关键设备,受到广泛的关注。尤其是特高压直流换流站通常工作在双12脉动条件下,由换流器产生大量谐波流过换流变压器绕组,由此产生了巨大的谐波损耗,严重影响换流变压器的温升及负载能力,据统计换流变压器的负载损耗约占换流站总损耗的35%～50%。本文针对目前特高压换流变压器损耗测量困难的问题,通过研究提出一种适用特高压换流变压器谐波损耗测量系统,采用大功率谐波电流源提供谐波电流,测量用谐波电流达到谐波电流额定量的10%～50%,能够准确测量换流变压器谐波损耗频率特性,对换流变压器运行维护以及今后设计、制造的改进具有重要的指导意义。本文主要研究内容包括：(1)考虑到特高压换流变压器谐波损耗测量困难,以目前采用的IEC 61378-2法作为研究对象,通过分析换流变压器特点及运行工况,对谐波损耗进行了理论解析,分析了谐波损耗不同组成部分与频率的关系,进行相关仿真、实验工作后提出了换流变压器谐波损耗计算模型的修正方案。(2)在上述工作的基础上,提出了换流变压器谐波损耗测量系统方案,通过研制缩小比例的换流变压器,对缩小比例的换流变压器进行谐波损耗测量验证了测量方法的有效性、可行性并完善测量系统方案,通过缩小比例的换流变压器谐波损耗测量对计算方法进行校核。最终完成了适用于实际换流变压器谐波损耗测量分析的测量系统。(3)针对换流变压器现场谐波损耗测量环境,提出具体实验方案,采用目前常用的IEC 61378-2法和本文提出的方法分别对换流变压器进行了现场谐波损耗测量,完成数据的对比分析工作,进一步完善换流变压器谐波损耗计算模型。采用修正后的计算模型对换流变压器谐波损耗进行解耦分析,得到各次谐波下绕组及连接件的涡流损耗和箱体及结构件的杂散损耗值,结合现有文献中的仿真分析,验证了修正计算模型的准确性与通用性。
[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.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：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.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM41
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1 ;天威保变第三台换流变压器一次试验成功[J];变压器;2009年01期
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3 李溪;;大型换流变压器的移位方法[J];沿海企业与科技;2012年10期
4 文，
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