Stability Criteria for Constant Power Loads With Multistage LC Filters

In high-voltage dc power systems of advanced aircraft, most of the electrical motor drives and power electronic converters behave as constant power loads (CPLs) when tightly regulated and usually cause negative impedance instability problems. This paper presents stability criteria for an electrical...

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Bibliographic Details
Published in:IEEE transactions on vehicular technology 2011-06, Vol.60 (5), p.2042-2049
Main Authors: Liu, Xinbo, Zhou, Yuanjun, Zhang, Wei, Ma, Shuohan
Format: Article
Language:English
Subjects:
Applied sciences
Capacitors
Capacitors. Resistors. Filters
Circuit properties
Constant power loads (CPLs)
Criteria
Direct current
Direct current networks
Dynamics
Electric potential
Electric power generation
Electric, optical and optoelectronic circuits
Electrical engineering. Electrical power engineering
Electrical power engineering
Electronic circuits
Electronics
Exact sciences and technology
Filtering theory
Frequency filters
Impedance
Instability
Miscellaneous
mixed potential modeling
Multistage
multistage LC filters
negative incremental impedance
Power networks and lines
Power system stability
Stability
Stability criteria
Various equipment and components
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Summary:In high-voltage dc power systems of advanced aircraft, most of the electrical motor drives and power electronic converters behave as constant power loads (CPLs) when tightly regulated and usually cause negative impedance instability problems. This paper presents stability criteria for an electrical system constituted of a dc power supply, multistage LC filters, and an ideal CPL. The derived criteria are based on the Brayton-Moser mixed potential theory and can be extended to actual CPLs. The dynamic negative incremental impedance of the CPL is used to place design constraints on the filter parameters to prevent instabilities. Simulation and experimental results confirm that the proposed criteria would guarantee system stability under different voltage disturbances.
ISSN:0018-9545
1939-9359
DOI:10.1109/TVT.2011.2148133