配电系统多功能电力电子变压器的研究
发布时间：2018-08-12 07:32
【摘要】：随着社会经济的飞速发展电力系统规模越来越大、新能源并网比重逐渐上升、各类非线性负荷、精密仪器和敏感负荷被同时大量应用,正是此种形势下用户对供电安全性可靠性以及电能质量的要求越来越高。配电变压器是最靠近用户的一种供电设备,固其运行稳定性、供电质量以及经济指标都会直接影响着用电设备的工作情况。传统变压器电压等级高、容量大且工艺发展成熟,但在发展过程中功能始终没变即变压、隔离和功率传输,因此难以满足用户对电能质量提出的更高要求。随着电力电子变压器(Power Electronic Transformer,简称PET)的出现为解决以上问题带来了新思路。PET不但具有传统变压器的所有功能,而且体积小重量轻、能抑制电压波动、电力谐波和短路故障等的双向传播,对电能质量起到极大的改善作用。PET同时兼有交、直流环节还能与FACTS装置相结合,其自身的特点使其具有处理当前电网出现的各种电能质量问题的潜能,固PET的研究对建设绿色电网和智能电网有着十分重要的理论意义和应用价值。本文首先总结国内外研究现;第二,介绍PET基本工作原理并对典型拓扑结构进行剖析,此外提出一种新型PET拓扑结构即PET单、三相混合供电拓扑结构;第三,推导数学模型并介绍PET控制方式;第四,分别介绍PET主要元件及其设计原理;第五,用PSCAD建立三相PET和新型拓扑结构模型:PET单、三相混合供电模型,并进行典型仿真试验和分析,仿真得到了较理想的结果充分验证了配电网PET对电能质量巨大的改善作用。
[Abstract]:With the rapid development of social economy, the scale of electric power system is getting larger and larger, the proportion of new energy connected to grid is rising gradually, all kinds of nonlinear load, precision instrument and sensitive load are applied in a large number at the same time. It is precisely under this situation that users demand more and more high power supply security, reliability and power quality. Distribution transformer is a kind of power supply equipment closest to the user. The stability of operation, the quality of power supply and the economic index will directly affect the working condition of the equipment. Traditional transformers have high voltage grade, large capacity and mature process development, but their functions have not changed in the process of development, that is, voltage transformation, isolation and power transmission, so it is difficult to meet the higher requirements of power quality put forward by users. With the emergence of (Power Electronic Transformer, for power electronic transformers, it brings a new idea to solve the above problems. Pet not only has all the functions of traditional transformers, but also has small size and light weight, which can restrain voltage fluctuation. The bidirectional propagation of power harmonic and short circuit faults can greatly improve the power quality. Pet has the function of both AC and DC, and the DC link can also be combined with the FACTS device. Its own characteristics make it have the potential to deal with all kinds of power quality problems which appear in the current power grid. The research of solid PET has very important theoretical significance and application value for the construction of green power grid and smart grid. This paper first summarizes the current research at home and abroad; second, introduces the basic working principle of PET and analyzes the typical topology, in addition, puts forward a new type of PET topology, that is, PET single-phase, three-phase hybrid power supply topology. The mathematical model is derived and the control mode of PET is introduced. Fourthly, the main components and their design principles of PET are introduced respectively. Fifthly, the three-phase PET and the new topology model of one-phase, three-phase hybrid power supply are established by using PSCAD. The simulation results show that the distribution network PET can improve the power quality greatly.
【学位授予单位】：贵州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM41
本文编号：2178345
[Abstract]:With the rapid development of social economy, the scale of electric power system is getting larger and larger, the proportion of new energy connected to grid is rising gradually, all kinds of nonlinear load, precision instrument and sensitive load are applied in a large number at the same time. It is precisely under this situation that users demand more and more high power supply security, reliability and power quality. Distribution transformer is a kind of power supply equipment closest to the user. The stability of operation, the quality of power supply and the economic index will directly affect the working condition of the equipment. Traditional transformers have high voltage grade, large capacity and mature process development, but their functions have not changed in the process of development, that is, voltage transformation, isolation and power transmission, so it is difficult to meet the higher requirements of power quality put forward by users. With the emergence of (Power Electronic Transformer, for power electronic transformers, it brings a new idea to solve the above problems. Pet not only has all the functions of traditional transformers, but also has small size and light weight, which can restrain voltage fluctuation. The bidirectional propagation of power harmonic and short circuit faults can greatly improve the power quality. Pet has the function of both AC and DC, and the DC link can also be combined with the FACTS device. Its own characteristics make it have the potential to deal with all kinds of power quality problems which appear in the current power grid. The research of solid PET has very important theoretical significance and application value for the construction of green power grid and smart grid. This paper first summarizes the current research at home and abroad; second, introduces the basic working principle of PET and analyzes the typical topology, in addition, puts forward a new type of PET topology, that is, PET single-phase, three-phase hybrid power supply topology. The mathematical model is derived and the control mode of PET is introduced. Fourthly, the main components and their design principles of PET are introduced respectively. Fifthly, the three-phase PET and the new topology model of one-phase, three-phase hybrid power supply are established by using PSCAD. The simulation results show that the distribution network PET can improve the power quality greatly.
【学位授予单位】：贵州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM41
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