Research On Suppressing Of Low-Frequency Oscillation Of Power System Based On Battery Energy Storage

Along with the development of China's electric power system, the regional power grids will be gradually interconnecting, the system will be further expanded . The benefits of connected power system is obvious, including power consumption efficiency, peak adjusting benefits, compensation adjustment for an inter-basin hydroelectricity and electricity efficiency, reduce reservation and emergency support effectiveness and so on. But power system interconnection has also brought a series of new issues to the operation, such as the possible negative or weakly damped oscillation, the reducement of security and stability levels, the emergence of stability weak links in the grid. In January this year, more than 10 provinces and municipalities in southern China suffered heavy snowstorm, electric grids were damaged in many provinces, power system stability was devastated, which eventually led to the large-scale blackout. Power system stability is the most important issue for the electric power system, therefore appropriate measures should be taken to strengthen the security of the gridFirstly, the basic concepts of energy storage devices and low-frequency oscillations of the electric power system are introduced, as well as the great significance of the application of energy storage devices in China. Based on the suppression of the low frequency oscillation requirements, this paper designs and simulates various battery energy storage device controllers, the electromechanical mathematical models and associated parameter choices of generators and transformers based on PSS/E transient Model, and battery energy storage devices suppressing low-frequency oscillations in the 4-machine 2-area power system and the East China Power Grid. The results show that a proper controller with appropriate parameters of the battery energy storage devices can improve system stability and suppress low-frequency oscillations.Moreover, this paper proposes the concept of smallest battery capacity and preliminarily discusses the economics of battery energy storage devices. In the end, this paper briefly introduces the battery energy storage devices currently in operation.