Temperature Controller Stability Resolution for ISS Nodes 2& 3 IATCS Loops

A typical feature of an active loop thermal system is to guarantee a tight temperature range to the users through stable and fast control dynamics. In this framework, Alenia Spazio developed a dedicated Temperature Control Loop Analyzer (TeCLA) as a tool to assess the suitability of the software controlled algorithm for International Space Station (ISS) Nodes 2& 3 water loops. This tool defines the stability regions as a function of the control law gains and allows the screening of the operative scenarios to identify the worst cases, thus reducing costs by drastically limiting the candidates for a verification-development test campaign. This paper presents the TeCLA features and its application on the active thermal control loops of ISS Nodes 2& 3.