Determination of the grid impedance in power consumption modes with harmonics

IF 2.4 Q2 MINING & MINERAL PROCESSING
A. Skamyin, V. Dobush, M. Jopri
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Abstract

The paper investigates the harmonic impedance determination of the power supply system of a mining enterprise. This parameter is important when calculating modes with voltage distortions, since the determined parameters of harmonic currents and voltages significantly depend on its value, which allow the most accurate modeling of processes in the presence of distortions in voltage and current. The power supply system of subsurface mining is considered, which is characterized by a significant branching of the electrical network and the presence of powerful nonlinear loads leading to a decrease in the power quality at a production site. The modernization of the mining process, the integration of automated electrical drive systems, renewable energy sources, energy-saving technologies lead to an increase in the energy efficiency of production, but also to a decrease in the power quality, in particular, to an increase in the level of voltage harmonics. The problem of determining the grid harmonic impedance is solved in order to improve the quality of design and operation of power supply systems for mining enterprises, taking into account the peculiarities of their workload in the extraction of solid minerals by underground method. The paper considers the possibility of determining the grid impedance based on the measurement of non-characteristic harmonics generated by a special nonlinear load. A thyristor power controller based on phase regulation of the output voltage is considered as such a load. Simulation computer modeling and experimental studies on a laboratory test bench are used to confirm the proposed method. The recommendations for selecting load parameters and measuring device connection nodes have been developed.
带谐波的电力消耗模式下电网阻抗的测定
本文对某矿山企业供电系统谐波阻抗的确定进行了研究。当计算具有电压畸变的模式时,该参数很重要,因为谐波电流和电压的确定参数在很大程度上取决于其值,这允许在电压和电流存在畸变的情况下最准确地建模过程。考虑了地下采矿供电系统的特点,即电网存在明显的分支,且存在强大的非线性负荷,导致生产现场电能质量下降。采矿过程的现代化、自动化电气驱动系统的集成、可再生能源、节能技术导致了生产能源效率的提高,但也导致了电能质量的下降,特别是电压谐波水平的提高。针对矿山企业地下开采固体矿物作业负荷的特点,解决了确定电网谐波阻抗的问题,提高了矿山企业供电系统的设计和运行质量。本文考虑了通过测量特殊非线性负载产生的非特征谐波来确定电网阻抗的可能性。基于输出电压相位调节的可控硅功率控制器被认为是这样一个负载。通过计算机仿真建模和实验室试验台的实验研究,验证了该方法的有效性。提出了选择负载参数和测量设备连接节点的建议。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Mining Institute
Journal of Mining Institute MINING & MINERAL PROCESSING-
CiteScore
7.50
自引率
25.00%
发文量
62
审稿时长
8 weeks
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