One, foreword
With the rapid development of power electronic technology, since the 1990 s ac frequency conversion speed regulation has become the mainstream of electric transmission, the scope of its application is increasingly wide. But because the frequency converter is used in a variety of electrical environment, if do not take appropriate protective measures, can affect the inverter running stability and reliability. Practice has proved that proper matching reactor with frequency converter, can effectively prevent overvoltage caused by ac switch operation and impact of the surge current to him, at the same time also can reduce the harmonic pollution to power network, produced by the frequency converter and can improve the power factor of the inverter. Therefore to study the effect of with frequency converter used in all kinds of reactor and capacity selection problem is very necessary.
Second, the frequency converter used reactor
1. Input reactor (ACR), it can restrict the grid voltage mutation and operating overvoltage caused by current shock, effectively protect the inverter and improve its power factor. Access to and when not connected to the input reactor, the input harmonic current situation of power grid, as shown in the figure below. Can be seen from the graph after the access to the reactor can effectively restrain the harmonic wave.
2. Dc reactor (DCR), in the inverter dc rectifier link and link between the inverter and DCR can make the inverter link operation is more stable, and improve the power factor of the inverter.
3. The output reactor (ACR), between the inverter output and load (motor), have the effect of frequency converter noise control.
Three,
Frequency converter used in the reactor of the frequency converter system stable, reliable operation has considerable effect, of which the effect of input reactor, it can effectively protect the rectifier inverter system from the impact of the overvoltage and surge current, and can improve the power factor of inverter system, this company produces the reactor is good quality, reasonable price, perfect match, imports worth pushed through application.
