Naval ships as well as aerospace power systems are incorporating a greater degree of power electronic switching sources and loads. Although these components provide exceptional performance, they are prone to instability due to their high efficiency and constant power characteristics that can exhibit negative impedance nature at certain frequencies. When designing these systems, integrators must consider the impedance versus frequency at an interface (which designates source and load). Stability criteria have been developed in terms of source and load impedances for both dc and ac systems, and it is often helpful to have techniques for impedance measurement. For dc systems, the measurement techniques have been well established. This paper introduces a new method of impedance measurement for three-phase ac systems. By injecting an unbalanced line-to-line current between two lines of the ac system, all impedance information in the traditional synchronous reference frame d-q model can be determined. For medium-voltage systems, the proposed technique is simpler and less costly than having an injection circuit for each phase. Since the current injection is between only two phase lines, the proposed measurement device can be used for both ac and dc interfaces. Simulation and laboratory measurements demonstrate the effectiveness of this new technique.
J. Huang et al., "Small-Signal Impedance Measurement of Power-Electronics-Based AC Power Systems Using Line-to-Line Current Injection," IEEE Transactions on Power Electronics, Institute of Electrical and Electronics Engineers (IEEE), Feb 2009.
The definitive version is available at http://dx.doi.org/10.1109/TPEL.2008.2007212
Electrical and Computer Engineering
Naval Surface Warfare Center
Keywords and Phrases
Electric Impedance Measurement; Power Electronics; Power System Measurement
Article - Journal
© 2009 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.