At present, there are more and more complex types and quantities of power quality pollution. In order to fully grasp the real-time situation of power quality pollution, it is necessary to directly obtain the relevant information of power quality through the real-time power quality online monitoring device, which is the basis and premise of comprehensive power quality control.

In recent years, some related enterprises at home and abroad have carried out a lot of exploration and Research on the application and development of power quality monitoring technology, and developed and applied many monitoring equipment such as online, intelligent and systematic.

The technology of power quality monitoring system can monitor voltage deviation, voltage qualification rate, power supply reliability, frequency deviation, voltage harmonic, current harmonic, voltage / current extreme value, voltage / current curve and load curve. It can be used in three-phase and three-wire monitoring points such as substation bus, user dedicated line, public distribution transformer, etc. it has the function of historical data storage and remote communication Through the wireless, wired, telephone and other ways to form an automatic monitoring network, we can timely grasp the power quality status, statistics of voltage qualified rate and harmonic analysis.

It is the basis of pollution control to master the operation status of power supply network. The real-time monitoring of power quality is the direct way to grasp the dynamic state of power quality, and it is also the basis of comprehensive treatment of power quality.

Analysis and diagnosis of power quality change is the premise of pollution control. Based on the detailed analysis of power quality data, the inherent resonance characteristics of power grid structure are simulated and analyzed by using simulation analysis software to eliminate false harmonic interference.

The reasonable design and transformation of the system is the link of pollution control. Before the design and operation of substation and the operation of new power users, technical consultation on harmonic source load and power quality requirements, line network transformation and construction should be combined with the characteristics and measures of operation load, so as to reduce line loss and equipment loss accidents.