对广大供电企业来说，用户功率因数的高低，直接关系到电力网中的功率损耗和电能损耗，关系到供电线路的电压损失和电压波动，而且关系到节约电能和整个供电区域的供电质量，这是众所周知的道理。提高电力系统的功率因数，已成为电力工业中一个重要课题。文中简要集中探讨了影响电网功率因数的主要因素以及低压无功补偿的几种实用方法，和确定无功补偿容量从而提高电力系统功率因数的一般方法。-For the majority of power supply enterprises, the level of user power factor, is directly related to the power loss and power loss in the power grid, related to the voltage of the power supply line losses and voltage fluctuations, but also to save energy and supply area for electric quality, this is a well-known truth. Improve the power factor of the power system, the power industry has become an important topic. Briefly several practical approach focuses on the main factors affecting the grid power factor and low voltage reactive compensation, and determine the reactive power compensation capacity of the general method to improve the power factor of power system.