Transient stability analysis of series unbalanced conditions using dedicated mixed-signal hardware

This paper examines the use of the symmetrical components theory for the representation of unbalanced conditions, when using the concept of analog emulation for highspeed power system analysis. This concept has been proven and validated through the realization of a mixed-signal hardware platform dedicated to power system studies. Computations related to the grid are handled by analog electronics, while the models of the network components are implemented on a digital processing core. Balanced operation is natively supported, while unbalanced operation is handled with the symmetrical component theory. Particular focus is given on series unbalanced operations, such as the opening of a single-phase circuit breaker. A hardware architecture solution for the complete unbalanced conditions representation is described. The proposed approach has shown significant computational speed benefits compared to traditional digital solutions.