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access icon free Fast inrush voltage and current restraining method for droop controlled inverter during grid fault clearance in distribution network

© The Institution of Engineering and Technology
Received 08/08/2017, Accepted 28/10/2017, Revised 24/10/2017, Published 31/10/2017

Control mode switching strategy of droop controlled inverter can effectively avoid overcurrent during grid fault, but it is easy to cause inrush voltage and current during grid fault clearance, which leads to the failure of fault ride through process of the distribution network. In this study, a new control mode re-switching method is proposed on the basis of restricting the outputs of the off-line controllers, which can make sure that the inrush voltage and current are suppressed and return to the normal condition quickly. First, the dynamic characteristics of fault current of droop controlled inverter are analysed. Then, the instantaneous inrush voltage and current caused by the output saturations of voltage controller and power controller before the re-switching process are mainly discussed. This method takes full advantage of integration of the existing off-line controllers to limit the output saturations, which can make the inrush problems well solved, and reduce the influence on grid connected inverters and the distribution network. Simulation results verify the validity of the theoretical analysis.

Inspec keywords: invertors; power distribution control; power control; power grids; power distribution faults; voltage regulators

Other keywords: droop controlled inverter; fault ride through process; fault current; control mode re-switching method; instantaneous inrush current; instantaneous inrush voltage; fast inrush voltage restraining method; off-line controllers; control mode switching; grid connected inverters; power controller; voltage controller; distribution network; grid fault clearance; current restraining method

Subjects: Power and energy control; Voltage control; Control of electric power systems; Power electronics, supply and supervisory circuits; Distribution networks; DC-AC power convertors (invertors); Power system control

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