中文说明：
微电网保护问题与传统配电网保护有着极大的不同，典型表现在以下几个方面：
a.微电网在并网运行和孤岛运行两种运行方式下，短路电流大小不同且差异很大。
b.微电网中电源及相关负荷的接地方式对故障电流的大小影响也很大。
c.加入分布式能源后，微电网的双向潮流特性对微电网保护的方向判别也有新的要求。
d.发生故障时，微电网与配电网的不同隔离策略需要与微电网保护相结合，这也是微电网保护的关键。
English Description：
Microgrid protection is different from traditional distribution network protection in the following aspects: < / P > < p > < br / > < / P > < p > a. the short-circuit current of microgrid is different in grid connected operation and island operation The grounding mode of power supply and related loads in microgrid also has a great influence on the fault current After adding distributed energy, the bidirectional power flow characteristics of microgrid also have new requirements for the direction discrimination of microgrid protection When a fault occurs, different isolation strategies between microgrid and distribution network need to be combined with microgrid protection, which is also the key of microgrid protection