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| Stability Margin Monitoring for Distributed Power Systems Based on ESAC Criterion |
| Yang Xiaoping, Zhang Hao, Ma Xikui |
| Xi'an Jiaotong University Xi'an 710049 China |
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Abstract This paper introduces an approach to monitoring the stability margin of a distributed power system. Based on the ESAC (Energy Systems Analysis Consortium) criterion, the relationship between the output impedance of the source subsystem and the input impedance of the load subsystem is derived as the distributed power system has an unfavorable stability margin. Then, a small-signal perturbation current is injected into the DC bus. The stability margin monitoring based on the ESAC criterion can be completed by measuring the source-side and load-side response current, and a practical monitoring circuit implemented is proposed. Finally, the feasibility and superiority of the monitoring approach is confirmed by utilizing it in a distributed power system consisting of two buck converters.
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Received: 26 February 2008
Published: 17 February 2014
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2009, Vol. 24 
