270-VDC/hybrid 115-VAC electric power generating system technology demonstrator

Sundstrand is actively investigating the technologies required by 270-VDC, hybrid 115-VAC systems to meet power quality and stability requirements when supplying largely negative impedance loads. The design of the technology demonstrator system has focused on assembling a highly flexible test system that is capable of providing the data and experience necessary to successfully design and build a high-efficiency, high-reliability, fault-tolerant, low-weight, low-cost hybrid aircraft electrical system for future applications. Data taken to date indicate that voltage regulation requirements of Aerospace Standard AS1831 or MIL-STD-MS704E can be met with state-of-the-art technology. It is demonstrated that with improper source/load impedance matching, system instability can occur. Measurements of source and load impedance compare reasonably well in both magnitude and phase with analytical predictions