Power Knowledge | The "Earthquake" in the Power System: Forced Oscillation and Its Control Strategies

The power system is a complex system composed of various power equipment and lines, including generators, transformers, switches, cables, capacitors, etc. In the power system, the situation of forced oscillation may occur, which is a kind of vibration caused by unstable or uncoordinated system responses. This article will explore the causes, impacts, and control strategies of forced oscillation in the power system.

I. Causes of Forced Oscillation
In the power system, forced oscillation is caused by the presence of equipment or lines with mismatched frequency characteristics in the system. These mismatched characteristics may result from the mismatch of equipment parameters, the instability of equipment, or the errors in the system control strategy. For example, when there are multiple generators in the power system, if the frequency characteristics of these generators are different, it may lead to forced oscillation. In addition, if the impedance of the transmission line between the generator and the load is mismatched, it may also cause forced oscillation.

II. Impacts of Forced Oscillation
Forced oscillation may lead to the instability of the power system and system collapse. The oscillation will cause changes in the voltage and frequency in the power system, which may damage the power equipment and even lead to system collapse. Moreover, forced oscillation may also cause the instability of the voltage and current in the power system, which may affect other equipment in the system, thus leading to system instability.

III. Control Strategies
In order to solve the problem of forced oscillation, the power system needs to adopt some control strategies. The following are some common control strategies:

In conclusion, forced oscillation is a common problem in the power system. In order to ensure the stability and reliability of the power system, it is necessary to adopt some control strategies to reduce the occurrence of forced oscillation. These control strategies can be realized through technologies such as phase angle compensation, dynamic damping, frequency regulation control, and multi-machine coordination control. Through reasonable control strategies and system design, it is possible to help the power system achieve higher stability and reliability.