We do our thesis work on AF in the Karlstad at Nordic Paper in Säffle. Nordic Paper works with greaseproof paper and includes two large paper machines at its facility.

Nordic Paper has built a new section of its facility consisting of six new motors. These engines have a voltage drop at the motor starter and our goal is to reduce this voltage drop as much as possible. This is to be reduced by means of capacitors. This voltage drop can in turn lead to that they charge too much reactive power on the network because the engines require very reactive power. This reactive power outtake in turn can lead to penalties from the network owner. The voltage drop can cause complications to the equipment.

We have concluded that there are two good compensation methods to compensate the reactive power of these is by using power capacitors that are running all the time and starting battery which is running until the engine has started in the normal operating range.

A calculation was made to the capacitors and placements to the capacitors were produced by hand. We should do the same calculations in Neplan but a license to the program was missing so we couldn’t do any calculations.

The connection of the output capacitors reduced the voltage drop is not as much as was desirable when the simulation was done in Neplan

Calculations for alternate starting methods were developed when the result was not what we had hoped for.