The series inverter uses an AC reactor for inverter and a capacitor bank in series to form a reactive power compensation device. Its functions are:
1. Limit or even eliminate the amplification effect of the power reactor group on system harmonics when the series AC reactor for inverter is not installed.
2. Reduce the closing inrush current and inrush current frequency of the capacitor bank, making it easy to select loop equipment and protective capacitors.
3. Reduce the voltage value of this sub-harmonic on the bus to improve the quality of power supply.
4. Limit the current higher than this sub-harmonic current into the capacitor bank, suppress high-order harmonics, and protect the capacitor.
5. Reduce the discharge current value of the healthy capacitor bank to the faulty capacitor bank to protect the capacitor.
6. Reduce the inrush current multiple and frequency during the heavy breakdown of the opening arc of the capacitor bank breaker to facilitate the arc extinguishing at the fracture and reduce the amplitude of the operating overvoltage.
The AC reactor for inverter installed at the input of the inverter can inhibit the harmonics generated by the inverter from being transmitted to the grid, reduce the interference of the harmonics generated by the inverter on other electrical equipment, limit the abnormal fluctuation of the grid voltage and the inrush current on the grid, and reduce its impact on the inverter. The DC reactor is a smoothing reactor, which is mainly used on the DC side of the converter, and has more applications in general inverters. The DC current flowing through the DC reactor contains AC components. The DC reactor mainly limits the AC component superimposed on the DC current to a specified value, keeps the rectified current continuous, reduces the current ripple value, improves the input power factor, and reduces and prevents the rectifier bridge damage and capacitor overheating caused by the inrush current, and can suppress the harmonics generated by the converter device.