Functions Of Ac Reactor And Dc Reactor Of Inverter

The reactors that match the inverter are generally divided into two types: AC Reactors (input reactor, output reactor) and DC reactor. In actual applications, the corresponding reactor should be selected according to different situations.

The role of the input AC reactor: limit the current impact caused by the sudden change of the grid voltage and the operating overvoltage, smooth the peak pulses contained in the power supply voltage, or smooth the voltage defects generated by the bridge rectifier circuit during phase change, effectively protect the power components inside the inverter and improve the power factor. It can not only prevent interference from the grid, but also reduce the pollution of the harmonic current generated by the rectifier unit to the grid. The role of the output AC reactor: compensate for the influence of the distributed capacitance of the long line (50-200m), can curb the output harmonic current, improve the output high-frequency impedance, effectively curb and reduce the high-frequency leakage current, protect the inverter, and reduce the equipment noise. And it can improve the output waveform of the inverter and improve the efficiency of the inverter.

The DC reactor is connected between the DC rectifier link and the inverter link of the frequency conversion system. Its main function is to limit the AC component superimposed on the DC current to a certain specified value, maintain the continuity of the rectifier current, reduce the value of the current pulse, make the operation of the inverter link more stable and improve the power factor of the inverter.