Control of an Active Voltage Rectifier in a Generation System Based on a Synchronous Generator with Combined Excitation at a Variable Frequency of Rotation of the Generator Shaft

This paper describes a method for controlling an active voltage rectifier, which combines regulation of the dc output voltage and parametric regulation of the phase of the control signal at a given modulation depth with zero reactive current. Such control is possible in power-supply systems based on a synchronous generator with combined excitation and an active voltage rectifier at a variable speed of the electric machine shaft, in particular, in aircraft power-supply systems. At the same time, the consumption of reactive power by the synchronous generator is minimized and the energy efficiency and weight and size indicators of the entire system are increased. The active algorithm of voltage-rectifier control is implemented in a coordinate system rotating with the frequency of its input voltage, while input-voltage stabilization with a change in the generator-shaft speed is achieved by parametric control of the excitation current. The position of the generator rotor is determined by a rotor-position sensor located on its shaft. The reactive resistances of the electrical machine play the role of the buffer reactor. An algorithm for the formation of the phase of the control signal of an active voltage rectifier is proposed and studied when its rotating coordinate system is synchronized with respect to the generator voltage.