With the rapid development of economy, the proportion of nonlinear load users in the power grid is increasing, resulting in a serious decline in the quality of power supply, which is becoming more and more prominent. Seriously exceeding the standard of power quality is polluting the power supply environment on a large scale, endangering the safe and stable operation of power grid and its power supply equipment, and seriously affecting the economic benefits of power enterprises and users. Power quality monitoring device is one of the important equipment in the new generation of intelligent substation. It is very necessary to strengthen the monitoring of power quality whether from the safe operation of power grid or power supply quality.
The power quality on-line monitoring device has the following power quality monitoring functions: voltage deviation, frequency deviation, three-phase imbalance, harmonic, voltage flicker, temporary voltage rise, temporary interruption. At the same time, the basic electrical parameters and steady-state power quality indexes of the power grid at multiple monitoring points in the intelligent substation are monitored.
The debugging of power quality monitoring device is to realize the functions of each module, gradually debug each subsystem and improve the design. After ensuring that each module can complete the predetermined function, assemble a device, complete the overall calibration and conduct trial operation. After there is no problem, it can be networked for operation.
In order to ensure the stability of the device, the device is debugged in modules. After each module completes the specified functions independently, it can be debugged as a whole. The standard source linearly outputs different values. The device is calibrated according to the liquid crystal display, so as to improve the monitoring accuracy. The device is connected to the power grid and the monitoring results are uploaded to the server, so as to monitor the power quality at the low-voltage side in real time.
