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A power conditioning system consisting of a Super-conducting Magnetic Energy Storage (SMES) which can be used to smooth out differences between output power of a generator and power loads is analyzed in this paper. The SMES is connected in shunt with the distribution lines through a converter. The converter is a voltage source converter type with a DC-chopper. The system is controlled by three regulators; they are working on the DC-link voltage, the power to and from the SMES and the AC-currents in the inverter. The regulators controlling the power flow and the AC-currents are cascaded and the DC-link voltage controller is situated in an independent loop with its voltage kept constant using the SMES. Simulations have been carried out using the software PSCAD/EMTDC.