Integration of turbo-generator modules in digital transient network analyzer

The behavior of a small power system consisting of two interconnected generators is simulated in real-time by a prototype digital transient network analyzer (TNA). The prototype digital TNA consists of two computational modules and one I/O module. The modules communicate with each other through ribbon cables. Each computational module simulates one turbo-generator, its transformer, its governor, exciter, and power system stabilizer systems. The numerical integration is shared by two TMS320C30 DSPs at a step-size of 100 μs in realtime. The I/O module post-processes the state variables and presents selected information for analog display. The paper presents oscillograms from a test program which includes symmetry checks and behavioral checks against well known waveforms of hunting oscillations, synchronization out-of-phase torques, and subsynchronous resonance phenomena. The success of the digital TNA depends on: (a) the theoretical method of decoupled partitioning so that different portions of the power system can be allocated to different DSP-modules, (b) the architecture of the DSP-modules which can communicate the numerical integration results of one module to its contiguous neighbors with minimum delay