Operation mode combination method and system for main transformer differential protection sensitivity checking

• Main Authors: JIANG SHUAI, WANG JIANFENG, ZHANG YUNQI, YANG GUOSHENG, WANG CONGBO, DOU XUEWEI, ZHANG HAO, XUE ZHIYING, YU YUE, CAO HONG
• Format: Patent
• Language: Chinese; English
• Published: 23.06.2023
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

The invention discloses an operation mode combination method and system for main transformer differential protection sensitivity checking, and belongs to the technical field of relay protection. The method comprises the following steps: according to the operation experience of the flexible direct current system, carrying out system simulation on the flexible direct current system, and determining the minimum operation mode of the flexible direct current system; stopping new energy power supplies of other new energy stations except the new energy station where the to-be-checked main transformer is located; performing permutation and combination on the operation mode of the new energy unit carried by the main transformer to be checked and the operation mode of the new energy unit carried by the remaining main transformers in the new energy station where the main transformer to be checked is located to obtain a new energy unit operation mode combination; and combining the minimum operation mode of the flexible d