When the frequencies of the joined ac systems are different, there will be not only characteristic harmonics and uncharacteristic harmonics but also interharmonics.
在连接不同频率的交流网络时，它不仅存在通常HVDC系统的特征谐波、非特征谐波，还存在着间谐波。
When the frequencies of the joined ac systems are different, there will be not only characteristic harmonics and uncharacteristic harmonics but also interharmonics.
在连接不同频率的交流网络时，它不仅存在通常HVDC系统的特征谐波、非特征谐波，还存在着间谐波。
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