Physical Simulation of a 17 Level Cascaded H-Bridge Inverter on System-Level Using Average Models and Comparison to the Circuit-Level

Inhalt:
The modern physical simulations of power electronics shortens the system design time and accelerates the implementation phase. This paper presents the implementation of a simulation based system design and modelling of a 17 level cascaded H-bridge inverter to be used in a battery energy storage system. The simulations shown are performed within Simulink environment on the circuit and the system-level and their performance is compared and analysed. The circuit simulation uses ideal switches and considers the dynamics of the inverter. It allows the design of the power filter as well as the system controller. From this level, the software for further hardware implementation is generated. Increasing the abstraction to the simulation on system-level reduces the simulation duration more than 350 times compared with the simulation on circuit-level and allows long term prediction of the behaviour of the storage system.