Judgment method and system applicable to crowbar protection input of double-fed fan of power grid

• Main Authors: LU YI, ZHOU PEIPENG, HAN BIN, XIANG ZUTAO, HUO QIDI, LIU CHANGQING, XU WENJIA
• Format: Patent
• Language: Chinese; English
• Published: 10.11.2023
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

The invention discloses a method and a system suitable for judging that a doubly-fed fan of a power grid is put into crowbar protection, and belongs to the technical field of electrical equipment. The method comprises the following steps: after a power grid has a fault, judging the fault type of the power grid; if the fault type is a symmetric fault, calculating the maximum current value of the rotor side of the doubly-fed fan of the power grid through a first preset formula when the symmetric fault occurs in the power grid; if the fault type is an asymmetric fault, calculating the maximum current value of the rotor side of the doubly-fed fan of the power grid through a second preset formula when the asymmetric fault occurs in the power grid; and judging whether the maximum current value of the rotor side of the doubly-fed fan of the power grid meets a crowbar protection loop action criterion or not, and if yes, performing crowbar protection action on the doubly-fed fan of the power grid. The short-circuit cu