Meanwhile, the operational security of AC power grids becomes increasingly prominent.
同时，交流大电网运行安全问题也日益突出。
The reason was that over the short distances spanned by early power grids, AC transmission suffers lower losses than DC. It thus became the industry standard.
选择交流电作为工业标准的原因很简单，在早期供电距离很短的电网里，交流电的损耗比直流电小。
In domestic AC interconnected area power grids the low-frequency oscillations still exist due to insufficient damping.
在我国大区交流互联系统中存在着区域间弱阻尼或负阻尼低频振荡问题。
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