There are three main magnet systems in Wendelstein 7-X, comprising in total 85 coils arranged in 22 independent circuits fed by steady state power supplies. The superconducting coil system creates the main magnetic field and consists of 70 coils, grouped in seven electrical circuits with ten coils each with an inductance of about one Henry. Each circuit is fed by one power supply with a maximum current of 20 kA and a maximum voltage of +/-30 V. The power supplies were tested so far using copper coils with one m Omega and one mH. The integral commissioning of the completed coil circuits has been running since the end of April 2015. The second coil system is the so-called trim coil system, intended for enhanced experimental flexibility and error field corrections. It consists of five independently powered copper coils which are placed on the outer side of the cryostat. They will be operated with currents of up to 1.95 kA. Each power supply is connected to the 400 V three phase grid and consists of an input transformer with dual secondaries connected to two three phase systems, followed by two diode six pulse diode bridges, configured as a 12 pulse rectifier. The power conversion is accomplished with paralleled H-bridges using IGBT. The full scale ratings of a power supply are +1 2200 A(dc) and +/-230 V(dc). Tests at full current were performed on the power supplies using dummy loads, and successful tests were performed on the actual trim coils up to 2/3 of rated current in November 2014. The third magnet system is the divertor control coil system. The ten normal conducting copper coils are situated inside the plasma vessel behind the divertor targets and are arranged in ten independent circuits. The 12 pulse system of these power supplies is generated in the same manner as the power supplies for the superconducting coils, followed by rectifier diodes. The inverter stage is made up of an H-bridge converter with 12 MOSFET transistors in parallel per branch. The current rating of the power supply is a DC value up to +/-2500 A, which can be modulated by an AC current of up to 625 A with frequencies up to 20 Hz. The final commissioning of the control coil system has been started in February 2015.