全电流补偿消弧线圈关键技术研究

发布时间：2018-05-01 03:31

本文选题：全电流补偿消弧线圈 + 接地残流　；参考：《中国矿业大学》2014年博士论文

【摘要】：随着城市配电网容量的日益增大和非线性负荷及电缆线路的大量增加，接地故障残余电流中的阻性和谐波电流成分随之大幅提高。全电流补偿消弧线圈可有效地解决这些成分的补偿问题，，同时抑制电弧接地过电压，保证配电网供电的安全性和可靠性。本文对全电流补偿消弧线圈的关键技术展开研究。为了得到接地残流的真实数据，对数十个电网电容电流进行测试。以谢桥矿接地实验为例进行分析和研究，给出了实验结果和分析结论，作为以下各章内容的研究基础。由于现有的对接地残流的研究具有局限性，本文提出需先对双谐波源的单相接地故障系统进行分析，从理论上研究谐波源类型和故障点位置对故障点谐波电压和电流的影响。补偿接地残流的技术问题分别为残流补偿依赖选线结果与对地参数的估算和有源逆变装置的使用会带来系统的不稳定，本文提出的利用系统零序电压作为分析对象的检测方法新思路可以解决这些问题。单相接地故障系统模型的准确建立是实现零序电压检测的重要步骤。本文提出全电流补偿消弧线圈系统的动态相量建模方法。该方法可以根据分析需要对模型进行变化，也可以有目的的选择单一频率进行分析。该建模方法不仅适用于接地故障电流暂态分量丰富的情况，而且可应用于含有电力电子装置的全电流补偿消弧线圈系统，仿真结果验证了其可行性。现有的暂态分析研究缺乏对暂态信号特征及故障信息的提取和利用方式方面的内容，本文对故障暂态信号进行频域分析并对系统了进行仿真建模，目的在于得到暂态电压和电流在不同频段内的分布规律。主从式全电流补偿消弧线圈结构的本质是传统消弧线圈和逆变器的并联，针对主消弧线圈的不同类型，本文给出了全电流补偿消弧线圈的主从控制思路，并提出了基于动态相量建模的全电流补偿消弧线圈的无源性控制方法。该方法实现了零序电压检测且从全局寻求系统的稳定，响应快速，形式简单、鲁棒性好。仿真和物理实验验证了其可行性与优势。本文阐述了主消弧线圈分布安装和增设从消弧线圈的必要性，提出了适合于分布安装的全电流补偿消弧线圈的结构，分析了其电气性能并给出了相应的系统评价，对不同分布安装方式下的系统做仿真对比实验，结果表明分布安装有助于降低接地残流。最后给出了一款基于Matlab仿真环境下可以判断孤立电网运行情况的软件，该软件可以动态地模拟含有各类分布式发电设备的孤网系统并对其能量进行分配与规划。基于适合于分布式安装的全电流补偿消弧线圈的概念，给出了适用于孤网环境的全电流补偿消弧线圈装置的软硬件设计。
[Abstract]:With the increasing capacity of urban distribution network, nonlinear load and cable line, the resistive and harmonic current components in the residual current of grounding fault are greatly improved. The full current compensated arc suppression coil can effectively solve the compensation problem of these components, at the same time restrain the arc grounding overvoltage, and ensure the safety and reliability of distribution network power supply. In this paper, the key technology of full current compensation arc suppression coil is studied. In order to obtain the real data of grounding residual current, dozens of grid capacitive currents are tested. Taking the grounding experiment of Xieqiao Mine as an example, the experimental results and conclusions are given, which are the basis of the following chapters. Due to the limitation of the existing research on the grounding residual current, this paper proposes that the single-phase grounding fault system with double harmonic sources should be analyzed first, and the influence of the type of harmonic source and the location of fault point on the harmonic voltage and current of the fault point is studied theoretically. The technical problems of compensating grounding residual current are that the residual current compensation dependent line selection results and the estimation of ground parameters and the use of active inverter device will lead to the instability of the system. In this paper, a new method of detecting zero sequence voltage can solve these problems. The accurate establishment of single-phase grounding fault system model is an important step to realize zero sequence voltage detection. A dynamic phasor modeling method for full current compensated arc suppression coil system is presented in this paper. The method can change the model according to the need of analysis, or select a single frequency to analyze it purposefully. This modeling method is not only suitable for the case where the transient components of the grounding fault current are abundant, but also can be applied to the full-current compensated arc-suppression coil system with power electronic devices. The simulation results show that the method is feasible. The existing research on transient analysis lacks the content of extracting and utilizing the transient signal characteristics and fault information. In this paper, the fault transient signal is analyzed in frequency domain and the system is simulated and modeled. The purpose of this paper is to obtain the distribution of transient voltage and current in different frequency bands. The essence of the master-slave full-current compensation arc-suppression coil is the parallel connection between the traditional arc-suppression coil and the inverter. In view of the different types of the main arc-suppression coil, the master-slave control idea of the full-current compensated arc-suppression coil is given in this paper. A passive control method for full current compensated arc-suppression coil based on dynamic phasor modeling is proposed. This method realizes zero-sequence voltage detection and seeks the stability of the system from the global perspective. The method has the advantages of fast response, simple form and good robustness. The feasibility and advantage of the method are verified by simulation and physical experiments. This paper expounds the necessity of the distribution installation of the main arc suppression coil and the addition of the slave arc suppression coil, puts forward the structure of the full current compensated arc suppression coil suitable for the distributed installation, analyzes its electrical performance and gives the corresponding system evaluation. The simulation results show that the distributed installation is helpful to reduce the grounding residual current. Finally, a software which can judge the operation of isolated power grid based on Matlab simulation environment is presented. The software can dynamically simulate the isolated network system with various distributed generation equipment and distribute and plan its energy. Based on the concept of a fully current compensated arc-suppression coil suitable for distributed installation, the hardware and software design of a fully current compensated arc-suppression coil device suitable for the isolated network environment is presented.
【学位授予单位】：中国矿业大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TM475

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