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Provided is a distributed-power-generation system capable of maintaining an operation point and a method of controlling the same. The distributed-power-generation system comprises: a fuel cell producing current and high-temperature gas through an electric chemical reaction of hydrogen and oxygen; a

Provided is a distributed-power-generation system capable of maintaining an operation point and a method of controlling the same. The distributed-power-generation system comprises: a fuel cell producing current and high-temperature gas through an electric chemical reaction of hydrogen and oxygen; a turbine obtaining rotation power using heat produced by the fuel cell; a compressor supplying air to the fuel cell using the rotation power of the turbine; a motor/generator unit acting as a motor using a current supplied from a battery in a starting mode, and as a generator rotating by rotation power of a turbine and generating a current in a generating mode; and an inverter unit supplying a DC power produced by the fuel cell and an AC power produced by the motor/generator unit for a three-phase power system. The method of controlling the distributed-power-generation system comprises: sensing a rotation speed of a rotation axis of the motor/generator unit; comparing the sensed rotation speed and a predefined reference speed; and supplying a current to the motor/generator unit to produce a load in the opposite direction of rotation of the rotation axis or in the same direction.

대표청구항 ▼

What is claimed is: 1. A method of controlling a distributed-power-generation system, the method comprised of: a) sensing a rotation speed of a rotation axis of a motor/generator unit; b) comparing the sensed rotation speed with a predefined reference speed; c) changing the rotation speed to match

What is claimed is: 1. A method of controlling a distributed-power-generation system, the method comprised of: a) sensing a rotation speed of a rotation axis of a motor/generator unit; b) comparing the sensed rotation speed with a predefined reference speed; c) changing the rotation speed to match the reference speed by controlling an amount of current supplied to the motor/generator; d) converting AC power produced by the motor/generator unit into DC power through a smoothing circuit; e) supplying the converted DC power along with DC power produced by a fuel cell to the main inverter; f) comparing the DC power supplied to the main inverter with a predefined reference power; g) altering the DC power produced by the fuel cell and changing the DC power supplied to the main inverter to match the predefined reference power; and h) supplying the DC power to one of the main inverter and a three-phase power system. 2. The method of claim 1, wherein the motor/generator unit produces a load in the opposite direction of rotation of the rotation axis according to current supplied from the battery. 3. The method of claim 1, wherein when the sensed rotation speed is higher than the reference speed, the rotation speed is changed to the reference speed by supplying a current to the motor/generator unit to produce the load in the opposite direction of rotation of the rotation axis. 4. The method of claim 1, wherein when the sensed rotation speed is lower than the reference speed, the rotation speed is changed to the reference speed by supplying a current to the motor/generator unit to rotate in the same direction of rotation of the rotation axis.