摘  要：针对煤矿电网中由于变频器的大量使用造成的供电质量降低问题，分别介绍了几种目前广泛应用的无功补偿技术的系统原理和技术特点。并通过一个具体的设计范例说明对煤矿井下进行无功补偿技术改造后有效的提高了电网功率因数，改善了电能质量，带来明显的经济效益。
关键词：无功补偿；煤矿井下；变频器
Abstract: Aiming at reducing the quality of power supply caused by a large number of frequency converters used in coal mine power grid, the system principle and technical characteristics of reactive power compensation technology which are widely used at present are introduced. And through a concrete example of the d