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This paper introduces the SMES into the DC bus of UPFC through a DC-DC chopper interface. This integrated power regulator can work as power flow regulator, bus voltage maintainer, power oscillation damper and uninterruptible power supplier. The detail working principle and work models are stated. The coordinated controller is studied for the property operation of the DC-DC chopper and the series/shunt...
This paper describes the configuration and control methods of wind power not connected to AC grid, but directly to DC loads in large wind farms. In order to balance the power in the bus, energy-storage units are introduced. When DC power does not balance in DC bus, voltage spikes and voltage level rising will appear in the DC bus, which are destructive to the electronic devices. The methods of restricting...
A novel dynamic voltage restorer (DVR) with flywheel energy storage system (FESS) is proposed in this paper, which can compensate the deep voltage sag. In order to increase the amount of stored energy, flywheel energy storage array (FESA) is employed. The topology of the system is introduced and the control strategies for the system are analyzed. An optimized discharging control strategy for the parallel...
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