传统的电能质量监测方法存在工作量大、数据采集不全面、不能实时掌握电网电能质量指标情况等缺点。讨论了电能质量实时在线监测的实施方法，设计了一种新型电能质量综合监测系统。该系统总体采用3级分布式结构，将多个以不同监测目标为对象的子系统集成在1个综合平台上，提高了系统的可扩展能力和大区域电网电能质量的监测能力。实际运行表明，该系统能够准确、可靠、实时地监测各项电能质量参数，并具有良好的暂态电能质量事件处理功能，大大增强了电力部门对电网的电能质量监管能力。

The traditional methods for power quality monitoring have the disadvantages of large amount of data processing, incomprehensive data collection, and unable to grasp the power quality indicators in real time. In this paper, the implementation of real-time and online monitoring the power quality is discussed, and a new type of power quality monitoring system is designed. The system with three-layer distributed structure integrates the subsystems with different monitoring objectives into a platform, improving extensible ability of the system and capabilities of power quality monitoring in large regional power system. It is shown from actual operation that the system can monitor power quality parameters accurately and reliably in real time, and is of good event handling function for transient power quality, greatly enhancing the capabilities of monitoring power quality by electric utilities.