Home

Research Areas

Recent Papers

Lab Facilities

Research Sponsors

Industrial Affiliates Program

Core Faculty

Collaborative Faculty

Research Engineers & Staff

Public Domain Simulations

Related Centers

ESAC 02 Annual Meeting

Stability of Power Electronics Based AC Systems

Sponsor: Office of Naval Research

Investigator(s): Wasynczuk, Sudhoff, Kuhn

High-bandwidth regulated converter loads, or constant-power loads (CPLs), exhibit a negative incremental input resistance (NIIR) within the regulation bandwidth of the power converter. Distributed power systems that include a large percentage of CPLs and contain energy storage devices may be susceptible to potentially destabilizing interactions of these elements. For the stand-alone converter, and in distributed dc systems, design-oriented requirements that guarantee stability have been set forth. For distributed ac systems with CPLs, however, design-oriented stability criteria have not been fully developed. The objective of this research is to present optimal stability criteria based on reference frame theory and the generalized Nyquist criterion. The purpose of these criteria is to ensure a safe stability margin without imposing undue restrictions on component designers and system integrators.