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Abstract
In regard to the rapid development of renewable energy sources, more and more photovoltaic (PV) generation systems have been connected to main power networks, and it is critical to enhance their transient performance under short-circuit faults conditions. This paper proposes and studies the coordinated control of a flux-coupling-type superconducting fault current limiter (SFCL) and a superconducting magnetic energy storage (SMES), to improve the fault ride through (FRT) capability and smooth the power fluctuation of a grid-connected PV generation system. Theoretical analyses of the device structure, operating principle and control strategy are conducted, and a detailed simulation model of 100 kW class PV generation system is built in MATLAB/SIMULINK. During the simulations of the symmetrical and asymmetrical faults, the maximum power point tracking (MPPT) control is disabled, and four different cases including without auxiliary, with SFCL, with SMES, and with SFCL-SMES, are compared. From the demonstrated results, the combination of without MPPT and with SFCL-SMES can more efficiently improve the point of common coupling (PCC) voltage sag, inhibit the DC-link overvoltage and alleviate the power fluctuation. Finally, a preliminary parameter optimization method is suggested for the SFCL and the SMES, and it is helpful to promote their future application in the real PV projects.
Highlights
Owing to the continuous increase in energy demands, black-outs, and environmental concerns regarding global warming, renewable energy sources have attracted more and more attention throughout the whole world to replace traditional fossil energy sources and achieve sustainable socio-economic development [1,2,3,4]
According to the above-mentioned background, this paper proposes the coordinated control of a flux-coupling-type superconducting fault current limiter (SFCL) and a superconducting magnetic energy storage (SMES) unit to improve a grid-connected PV generation system’s transient performance under fault conditions
This paper proposes and studies the coordinated control of a flux-coupling-type SFCL and a SMES unit, so as to improve the transient performance of a grid-connected PV generation system under the symmetrical and asymmetrical faults
Summary
Owing to the continuous increase in energy demands, black-outs, and environmental concerns regarding global warming, renewable energy sources have attracted more and more attention throughout the whole world to replace traditional fossil energy sources and achieve sustainable socio-economic development [1,2,3,4]. For an integrated utilization of the technical advantages of the two superconducting devices, some studies related to the coordinated control of SFCL and SMES have been performed, and the effects on improving the transient stability of a traditional power grid and enhancing the FRT capability of a wind farm have been verified in [49,50,51,52,53]. According to the above-mentioned background, this paper proposes the coordinated control of a flux-coupling-type SFCL and a SMES unit to improve a grid-connected PV generation system’s transient performance under fault conditions.
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