ltage swell will cause the trip of VFDs. And if the VFD of critical loads such as coal Рfeeder trips it will cause MFT acts and the generator will stop running. If more than one large generators Рstop running at the same time then it will challenge the third line of power system protection and even Рlarge scale of interruption and cause a threaten to grid’s safety problems. Against the poor ability of low Рvoltage ride through of power plant auxiliary machines, this paper proposes some solutions from the DC Рpower support technology and practical application verified the effectiveness and feasibility of the Рsolutions and the reliability of power supply is greatly improved. Р РKey words: power plant auxiliary machine; VFD; low voltage ride through; DC power support; power Рreliability Р Р7
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