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Inverter Line Reactor Application
The main function of the incoming line reactor is to reduce the current harmonic interference generated by the inverter, reduce the impact of the power surge on the inverter, and improve the unbalance of the three-phase power supply.
AC reactors are recommended in the following cases:
1. The inverter is powered by a line with very low impedance (the ratio of the power supply capacity to the inverter capacity is more than 10:1);
2. Connect multiple inverters on the same line;
3. The line power supply has obvious disturbance from other loads;
4. The line voltage is unbalanced;
5. The line contains a power factor correction device.


With the rapid development of power electronic technology, since the 1990s, AC variable frequency speed regulation has become the mainstream of electric drives, and its application range has become increasingly extensive. Since the inverter is used in various electrical environments, if proper protection measures are not taken, the stability and reliability of the inverter's operation will be affected. Practice has proved that the appropriate choice of reactor and the use of the inverter can effectively prevent the impact of overvoltage and surge current caused by operating the AC incoming switch, and can also reduce the harmonics generated by the inverter to the power grid. pollution, and can improve the power factor of the inverter. Therefore, it is very necessary to discuss the selection method of the incoming and outgoing line reactors matched with the frequency converter.