Modeling and Control-Tuning of a Single-Stage MMC-Based BESS

Abstract

In recent years, the integration of battery energy storage systems (BESSs) with multilevel modular converters (MMCs) has received interest in power system applications. In this work, this configuration is called a MMC-based BESS. The batteries are connected directly to the MMCs on submodules (SMs), called the single-stage approach. Several control strategies have been proposed to guarantee the proper operation of a MMC-based BESS. This system is complex due to the control strategy. Another challenge is in obtaining the controller gains for a MMC-based BESS converter. In this sense, there is a gap in the methodology used to calculate the controller gains. Thus, this work aimed to tune the analytical expressions of a MMC-based BESS by considering the single-stage approach. The methodology is validated through detailed simulation models of 10.9 MVA/5.76 MWh connected to a 13.8 kV power system. Finally, to validate the dynamics of the controllers, the simulation results in the PLECS software for the charging and discharging processes are presented.

Control tuning methodology for modular multilevel converter‐based STATCOM

“…Nevertheless, the use of a fuzzy controller increases the complexity of the tuning methodology. Pinto et al 28 propose a control tuning methodology for an MMC‐based battery energy storage system (BESS). This work proposed a straightforward method to compute the controller gain, which is very useful to investigate challenges in an MMC‐based BESS that are not directly coupled to the control scheme but require a proper control operation.…”