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Title: Impedance-based stability criterion for multiple offshore inverters connected in parallel with long cables
Authors: Zhang, X
Chung, HSH
Cao, LL 
Chow, JPW
Wu, W
Keywords: Impedance
Long cable
Parallel inverters
Small signal
Stability criterion
Transmission line
Two-port model
Issue Date: 2017
Publisher: Institute of Electrical and Electronics Engineers
Source: 2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017, 1-5 Oct. 2017, 8096607, p. 3383-3389 How to cite?
Abstract: In this paper, the stability study of a multiple offshore parallel long-eable-eonnected inverters (MOPLI) systeinhs has been presented. It is shown that, since this MOPLI system is consisted of a large number of different inverters and long cables, its stability assessment actually faces big challengs. In addition, though there are lots of existing impedance-based stability criteria about prallel inverters, most of them are based on two assumptions: all the inverters are the same and the impacts of the cables can be ignored. However, the above two assumptions are not established in the real MOPLI system. In order to solve this problem, this paper first rederive the models of the inverters and long cables one by one. Based on the rederived models, a general and concise three-step impedance-based stability criterion has been proposed for the MOPLI system. The proposed criterion is not only simple and practicable, but also fullv takes account of the inverters difference and the impacts of the cables. Finally, the effectiveness of the proposed criterion has been validated by a 4.9 kW MOPLI system, which is composed of 3 totoally different inverters & non-negligible cables.
ISBN: 9.78151E+12
DOI: 10.1109/ECCE.2017.8096607
Appears in Collections:Conference Paper

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