Control device for an intermediate circuit inverter, - wherein the intermediate circuit inverter has a DC voltage intermediate circuit in which an intermediate circuit capacitor is arranged, - wherein the intermediate circuit inverter has at least one feed inverter, by way of which electrical energy from a supply network is fed into the DC voltage intermediate circuit, - wherein the intermediate circuit inverter has at least one load inverter, by way of which electrical energy is supplied to a payload from the DC voltage intermediate circuit, - wherein the intermediate circuit inverter has at least one buffer inverter, by way of which a rotating centrifugal mass for bidirectional energy exchange is coupled to the DC voltage intermediate circuit, - wherein the control device controls the feed inverter, the load inverter and the buffer inverter, characterised in that - the control device implements a first voltage control, in which, on the basis of a rated voltage (U*) and an actual voltage which drops across the intermediate circuit capacitor, a target current (I*) is determined for the feed inverter and by which the feed inverter is controlled accordingly, - wherein the control device implements a speed control, in which, on the basis of a rated speed (ω*) and an actual speed (ω) of the centrifugal mass, a first rated torque portion (M1*) is determined for the centrifugal mass, - wherein the control device implements a second voltage control, in which, on the basis of the rated voltage (U*) and the actual voltage, a second rated torque portion (M2*) is determined for the centrifugal mass, - wherein the first and the second rated torque portion (M1*, M2*) are added to a rated torque (M*) and the buffer inverter is controlled accordingly. - wherein the intermediate circuit inverter has a DC voltage intermediate circuit in which an intermediate circuit capacitor is arranged, - wherein the intermediate circuit inverter has at least one feed inverter, by way of which electrical energy from a supply network is fed into the DC voltage intermediate circuit, - wherein the intermediate circuit inverter has at least one load inverter, by way of which electrical energy is supplied to a payload from the DC voltage intermediate circuit, - wherein the intermediate circuit inverter has at least one buffer inverter, by way of which a rotating centrifugal mass for bidirectional energy exchange is coupled to the DC voltage intermediate circuit, - wherein the control device controls the feed inverter, the load inverter and the buffer inverter, characterised in that - the control device implements a first voltage control, in which, on the basis of a rated voltage (U*) and an actual voltage which drops across the intermediate circuit capacitor, a target current (I*) is determined for the feed inverter and by which the feed inverter is controlled accordingly, - wherein the control device implements a speed control, in which, on the basis of a rated speed (ω*) and an actual speed (ω) of the centrifugal mass, a first rated torque portion (M1*) is determined for the centrifugal mass, - wherein the control device implements a second voltage control, in which, on the basis of the rated voltage (U*) and the actual voltage, a second rated torque portion (M2*) is determined for the centrifugal mass, - wherein the first and the second rated torque portion (M1*, M2*) are added to a rated torque (M*) and the buffer inverter is controlled accordingly.