When a battery storage system is capable of establishing and operating local grids in addition to mains operation, it presents significant advantages to the operator in terms of enhanced resilience, robustness and security. In particular, this includes the seamless continued operation of its systems in the event of a supply network failure.

Thanks to the decreasing costs of energy storage, PV-coupled storage applications are becoming increasingly attractive for a wide range of applications.

The cost and energy efficiency of AC-coupled battery systems for high voltages depends on the performance electronics required for connecting the battery to the power supply system. This article discusses the requirements and dependencies for a single-level approach which can save costs and increase system efficiency.