The advanced aircraft electrical power generation with voltage ±270 V DC BUS is presented. The possible consumption capacities and power consumption on regional aircraft with electric traction on takeoff and on cruise flight segment are analyzed. A battery-generator electric supply system is proposed, in which electric engines provide a traction of the plane, battery with permanent magnet generator are electric energy source. Upon that the combustion engine that works in economically mode and rotates shaft of permanent magnet generator. A power circuit of active rectifier is presented. It generates a bipolar output voltage ±270 V DC, provides a sinusoidal waveform of phase current and keeps power factor close to unity. The appliance of Enhanced Phase-Locked Loop for control system is presented. The developed special analytical and numerical computational procedures and modification of Lyapunov function method allow to determine stability areas and reveal unintended latent attractors in respect to proposed battery-generating electrical supply system. This article is of interest to developers of electrical supply systems with bipolar voltage DC in particular with a level of 270 V DC BUS