Electronic control circuit for electric regenerative power take-off and operation method thereof

A method for operating an electronic control circuit for an electric regenerative power take-off device comprising a synchronous generator (synchronous motor), a power converter (inverter) and a power bus connecting the power converter to the generator, the circuit comprising:

• an instant voltage sensor connectable to the power bus configured to capture the synchronous generator triphasic voltage (V_motor);
• an instant current sensor connectable to the power bus and configured to capture the synchronous generator triphasic current (I_motor);
• a phase-locked loop (“PLL”) to define an operation angle of the power converter and comprising a phase input;
• an electronic data processor;
• the method comprising, using the electronic data processor:
• calculating a voltage-based direct-quadrature (“DQ”) transform to output an equivalent two phase DQ-D and Q, tensor (Vd_motor, Vq_motor) from three voltage vectors of the captured triphasic voltage (V_motor);
• calculating a current-based DQ transform calculator to output an equivalent two phase DQ-D and Q, tensor (Iq, Id) from three current vectors of the captured triphasic current (I_motor);
• using a current-based DQ controller (Id controller, Iq controller) for outputting setpoint active-power and reactive-power voltages (Vd, Vq) for the power converter from the outputted DQ tensor of the current-based DQ transform calculator;
• switching from a 1st operation stage to a 2nd operation stage, wherein:
• the 1st stage comprises disengaging the power converter from the synchronous generator and synchronizing the PLL with the captured triphasic voltage by switching the PLL phase input to the voltage-based DQ transform calculator, and
• the 2nd stage comprises engaging the power converter from the synchronous generator and synchronizing the PLL with the captured triphasic voltage by switching the PLL phase input to the outputted DQ tensor output Q (Vq_motor) of the current-based DQ controller.