With the development of the new distribution network,distributed generation(DG)is widely connected to the distribution network.Due to the diversity and randomness of the operation state of DG,the traditional current pro-tection based on maximum operation mode and minimum operation mode is difficult to meet the"four characteristics"of protection at the same time.For this reason,we built a model of a new distribution network with multi-type and high-proportion DG access with low voltage crossing capability,analyzed the short-circuit calculation method of distribution network after multi-type DG access,and investigated the influence of DG access on current protection.In the improved scheme,the operating state of the distribution network was clustered into multiple operating state sets,and the setting value was updated when the operating state of the distribution network met the setting switching criterion to form an im-proved current protection suitable for the new type of distribution network,known as off-line calibration,online update.Finally,PSCAD/EMTDC simulation was used to verify the effectiveness of the proposed method.
关键词
新型电力系统/配电网/K-means++/运行方式/分布式电源/三段式电流保护
Key words
new distribution network/distribution network/K-means++/operation mode/DG/three-section current protection
维普
万方数据