Autonomous energy system for an aircraft

An autonomous energy system for an aircraft comprising:

• a high voltage network configured to provide energy to aircraft electrical loads,
• a main power source connected to the high voltage network,
• an energy storage,
• a voltage-controlled bidirectional DC-DC converter connected to the energy storage and to the high voltage network, and,
• a power control management system, wherein the power control management system is connected to the high voltage network and is configured to measure for voltage variations in the high voltage network,
• wherein the power control management system is connected to the energy storage and to the DC-DC converter to form an energy buffer module capable of providing and receiving a determined amount of power by a fixed voltage setpoint (Vset-point) to the high voltage network,
• wherein the power control management system is configured so that when the power control management system detects that a voltage drop variation (ΔVd_network) of the high voltage network is higher than a preset voltage discharge activation threshold (Vth_d_network_discharge_act) during a time (Δtd_network) higher than a preset time discharge activation value (tth_d_network_discharge_act), the power control management system provides power from the energy buffer module to the high voltage network until one of the following conditions are met:
• a current provided by the energy buffer module (Ibuffer) is lower than a first preset threshold discharge deactivation value (Ith_buffer_discharge_deact1) during a time (Δtbuffer) higher than a first preset discharge deactivation time (tth_buffer_discharge_deact1), and
• a charge of the energy storage is lower than a minimum usable charge, and
• a voltage rise variation of the high voltage network (ΔVr_network) is higher than a preset voltage rise discharge deactivation threshold (Vth_r_network_discharge_deact) and a current provided by the energy buffer module (Ibuffer) (1) is lower than a second preset threshold discharge deactivation value (Ith_buffer_discharge_deact2) during a time (Δtbuffer) higher than a second preset discharge deactivation time (tth_buffer_discharge deact2), and
• wherein the power control management system is further configured so that when the power control management system detects that the voltage rise variation (ΔVr_network) of the high voltage network is higher than a preset voltage charge activation threshold (Vth_r_network_charge_act) during a time (Δtnetwork) higher than a preset time charge activation value (tth_r_network_charge_act), the power control management system receives power from the high voltage network to the energy buffer module until one of the following conditions are met:
• a current provided by the energy buffer module (Ibuffer) is lower than a first preset threshold charge deactivation value (Ith_buffer_charge_deact1) during a time (Δtbuffer) higher than a first preset charge deactivation time (tth_buffer_charge_deact1), and
• a charge of the energy storage is higher than a maximum usable charge, and
• a voltage drop variation of the high voltage network (ΔVd_network) is higher than a preset voltage drop charge deactivation threshold (Vth_d_network_charge_deact) and a current provided by the energy buffer module (Ibuffer) (1) is lower than a second preset threshold charge deactivation value (Ith_buffer_charge_deact2) during a time (Δtbuffer) higher than a second preset charge deactivation time (tth_buffer_charge_deact2).