Study on the Fault Ride-through Capability of High Penetration Micro-grid Considering Coordinated Control of Fault Current Limiter and Energy Storage
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Abstract
In the case of that a micro-grid with high penetration of renewable resources is accessed into a power distribution network, the micro-grid's treatment mode and transient performance under the short-circuit fault condition will affect the power distribution network's operation characteristics dramatically. This paper analyzes the micro-grid's treatment modes corresponding to different fault locations, and proposes a technical idea considering the coordinated control of the fault current limiter and energy storage allocated inside the micro-grid. It is expected to actively strengthen the micro-grid's fault ride-through(FRT) capability as far as possible. And for some specific faults, the micro-grid should disconnect from the main network, and the coordinated control strategy can make the micro-grid implement a smooth transition between its grid-connected and islanded modes. Besides, directing at the some key issues related to the micro-grid's fault ride-through capability, the survey of research situation at home and abroad is carried out. At last, a typical micro-grid system is selected, and the simulation analysis is done to verify the effectiveness of the coordinated control.
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