Willy Hermansson

Robustness Evaluation of High-Voltage Press-Pack IGBT Modules in Enhanced Short-Circuit Test

This paper deals with the evaluation of robustness of high-power press-pack insulated-gate bipolar transistor modules under short-circuit conditions. The severity of the tests is usually related to the achievement of the real failure mode which drives the device to withstand a big amount of energy. The most well-known methods to evaluate the robustness of the devices have been analyzed and improved in order to operate with the highest achievable di/dt and to consequently emulate the real circuit setup and failure mode. Experimental tests will be shown and evaluated under different voltage and temperature conditions. The tests described in this paper have been targeted to evaluate the capability of the device to withstand extremely severe conditions when they are used in a high-power converter. A driving protection feature dealing with the target of improving the functionality of protection against failure will be also described.

DC-breaker for a multi-megawatt Battery Energy Storage System

Energy storage will gain importance in the future power system due to increased amount of renewables. In this paper, a utility scale Battery Energy Storage System (BESS) for megawatt utilizing a high voltage and a high power Voltage Source Converter (VSC) is proposed to be able to inject/consume the required power and energy to the grid. The batteries are both series and parallel connected on the DC-side of the VSC. In order to obtain high reliability, high availability and safety of the BESS, this paper proposes and analyzes a distributed Solid-State DC Breaker protecting the BESS and its batteries.