Degree

Doctor of Philosophy (PhD)

Department

Electrical and Computer Engineering (ECE)

Document Type

Dissertation

Abstract

In this research, functionalities and roles of Battery Energy Storage Systems (BESSs) in power systems are extended beyond primary frequency control (PFC). The BESSs, while participating in PFC, are controlled through charge controllers to first maintain their state-of-charge (SOC) within an acceptable range through a primary charge controller, and to recharge the BESS to its maximum SOC through a secondary charge controller. This forms a hierarchical frequency and SOC control of power grids with BESSs. In this regard, multiple BESS case is considered as well, and by employing the SOC balancing principle, it is shown that desired power sharing among BESS is occurred, and only one BESS is needed to be equipped with the proposed charge controllers.

As an important participation of BESS in frequency control, grid inertia enhancement can be performed through BESS for the inertial response of grid frequency that has been presented in the literature. However, this is contingent upon knowing the accurate knowledge of the equivalent grid inertia, which is variable due to the connection and disconnection of renewable energy resources, calling for inertia estimation to determine the deficit in the grid inertia. In this dissertation, adaptive control theory is used to control the grid inertia without the need for accurate information of the equivalent grid inertia. In this regard, multiple BESS case is also considered, and based on a novel control approach, the burden of inertia contribution is shared among BESSs under SOC balancing.

As another role of the BESS in frequency control, the cyber-attack mitigation is performed on the BESS side to detect and mitigate the adverse effect of false data injection (FDI) attacks on the communication links used for secondary frequency control. It is proven in this thesis that BESS-side attack mitigation excels in synchronous generator-side while considering the communication link delay, which always exists in power systems.

Date

7-11-2025

Committee Chair

Shuangqing Wei

DOI

10.31390/gradschool_dissertations.6894

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