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The reason is that several AC frequency converters are used at the same time, resulting in strong electromagnetic harmonic interference to the power grid. Although the electromagnetic harmonic generated by a single AC converter is in line with international standards, the harmonic generated by multiple AC converters when they are operating exceeds the standards, causing interference to the electrical equipment. Therefore, the problem is basically solved by adding an inductor filter on the b side of the AC inverter. This shows that attention should be paid to the harmonics produced when AC frequency converters are running, especially with the gradual increase in the use of AC frequency converters in recent years, in order to prevent it to the distributed control system and the computer and so on to harmonic comparison equipment to produce the bad influence.

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别老想着取悦别人，你越在乎别人，就越卑微。只有取悦自己，并让别人来取悦你，才会令你更有价值。一辈子不长，记住：对自己好点。

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DI814