摘要
大功率电机连接到孤岛电网,一般会采用软起动、变频器等,以提高电机的起动性能和供电的稳定性,同时设置无功补偿装置,以提高供电系统的功率因数和降低线路损耗。但如果软启动或变频器等选型不当,或者无功补偿配置不合理,可能会出现电压波动、功率振荡、供电质量下降,甚至引发安全等问题。本文以某供水泵站的供电系统为研究对象,首先介绍了泵站的供电系统,接着对泵站试车过程中出现的电气故障进行分析,然后对孤岛电网中大功率电机起动方案的优化及无功补偿装置的设置进行探讨,接着根据项目实际情况,提出将固态软起动器与实时无功补偿系统进行有机结合,采用合适容量的实时无功补偿系统,可降低大电机的起动电流和电网压降,较好地解决孤岛电站配电系统中大功率电动机启动期间电能质量差的问题,同时也对现有泵站供电系统提出几个备选方案供参考,最后给出几点建议。
When high-power motors are connected to an isolated power grid,soft starting,frequency converters,etc,are generally used to improve the starting performance of the motor and the stability of the power supply,At the same time,reactive power compensation devices are installed to improve the power factor of the power supply system and reduce line losses,However,if the selection of soft start or frequency converter is improper,or the reactive power compensation configuration is unreasonable,voltage fluctuations,power oscillations and power supply quality decreased,and even safety issues may occur,The article takes the power supply system of a certain water supply pumping station as the research object,Firstly,the power supply system of the pumping station is introduced,followed by an analysis of the electrical faults that occurred during the commissioning process of the pumping station,Then,the optimization of the high-power motor starting scheme and the setting of the reactive power compensation device in the isolated power grid are discussed,Based on the actual situation of the project,it is proposed to organically combine the solid-state soft starter with the real-time reactive power compensation system.The use of a suitable capacity real-time reactive power compensation system can reduce the starting current of the high-power motor and the voltage drop of the power grid,which can effectively solve the problem of poor power quality during the startup of the high-power motor in the distribution system of the isolated power station,At the same time,several alternative solutions for the power supply system of the pumping station are also proposed for reference,Finally,several suggestions are given.
作者
谭勇
TAN Yong(China ENFI Engineering Corporation,Beijing 100038,China)
出处
《有色设备》
2024年第2期65-70,共6页
Nonferrous Metallurgical Equipment
关键词
孤岛电网
大功率电机起动
实时无功补偿
供水泵站
矿山工程
供电系统
电气故障
islanded power grid
high power motor starting
real-time reactive power compensation
pumping station
mining engineering
power supply system
electrical fault
