Design and implementation of a control system for multifunctional applications of a Battery Energy Storage System (BESS) in a power system network

• A control system for the multifunctional applications of a battery energy storage system (BESS) proposed. • Determination of the battery parameters for the BESS model. • Design of appropriate controllers for the BESS control system. • Requirements for the implementation of the proposed control strategy in DIgSILENT Power Factory environment. • Demonstration of the applications of BESS for frequency supports during contingencies, reactive power support, power loss minimization and voltage deviation mitigation, using the proposed control system. This work proposes a design and implementation of a control system for the multifunctional applications of a Battery Energy Storage System in an electric network. Simulation results revealed that through the suggested control approach, a frequency support of 50.24 Hz for the 53-bus system during a load decrease contingency of 350MW was achieved. Without the control system, the frequency was 50.38Hz. Such a high frequency if not addressed, may result in a loss of synchronization among interconnected synchronous machines which could result in a decrease in voltage stability of the studied network. Besides, a reduction of about 2.05 MW in the active power losses was accomplished and a reactive power support of 3.63Mvar was realised. Thus, through the proposed strategy, Battery energy storage system has been enabled for frequency regulation, power loss minimization and voltage deviation mitigation resulting in an overall enhancement of the power quality of the electric power delivered in the studied networks. BESS providing a lower nadirs (frequency supports) using the proposed control system. BESS providing mitigation of voltage deviations (for appropriate locations) using the proposed control system. BESS providing power loss minimization (for appropriate location-bus 4)) using the proposed control system.