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Sustainability 2018, 10(1), 44; https://doi.org/10.3390/su10010044

Theoretical Analysis on the Short-Circuit Current of Inverter-Interfaced Renewable Energy Generators with Fault-Ride-Through Capability

1
The School of Technology, Beijing Forestry University, Beijing 100083, China
2
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, Beijing 102206, China
3
State Grid Xinzhou Power Supply Company, Xinzhou 034000, China
*
Author to whom correspondence should be addressed.
Received: 21 November 2017 / Revised: 18 December 2017 / Accepted: 19 December 2017 / Published: 25 December 2017
(This article belongs to the Special Issue Sustainable Electric Power Systems Research)
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Abstract

Renewable energy generators (REGs) usually employ power electronic devices for connecting with the grid, which makes their fault characteristics completely different from those of conventional synchronous generators. In the existing studies, the simulation methods are mainly adopted to analyze fault current contribution from REG. As a result, the explanations on the fault current show diversity and cannot reach a recognized standard. The REGs’ mathematical model in relay-setting calculations is unknown. Thus, this paper theoretically analyses the fault current characteristics of inverter-interfaced REGs (IIREGs) with fault-ride-through (FRT) ability. In order to understand the fault current characteristics, the FRT control strategy for IIREGs is firstly studied. Then the characteristics of high-frequency and fundamental-frequency fault currents from IIREGs are theoretically analyzed after and during the faults. The affecting factors and duration time of different frequency fault currents are, respectively, revealed. Further, the mathematical expression of fundamental fault currents from IIREGs are derived and verified based on the experimental test bench. The results can be used in estimating the IIREGs’ fault contributions and developing the fault calculation model. View Full-Text
Keywords: inverter-interfaced renewable energy generators; fault current; fault-ride-through control; wind power; solar power inverter-interfaced renewable energy generators; fault current; fault-ride-through control; wind power; solar power
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Liu, S.; Bi, T.; Liu, Y. Theoretical Analysis on the Short-Circuit Current of Inverter-Interfaced Renewable Energy Generators with Fault-Ride-Through Capability. Sustainability 2018, 10, 44.

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