Operation principle: the operation principle and the control processes of the main fuel supply system and secondary fuel supply system are the same, namely the regulation scheme which combines variable frequency pump control and proportional throttle valve control. The operation principle of the fuel supply system is that when the set value of the flow rate is larger (1.5L/min and above), the EHPFV is closed and the flow rate of the combustor is controlled by the pump; when the set value of the flow rate is smaller (1.5L/min below), the output frequency of the VFD is a constant value, and the flow rate of the combustor is controlled by the EHPFV which is installed in the bypass of the fuel circuit. Because the VFD and proportional valves have a greater adjustment range and a higher resolution, a large-scale and accurate control of flow rate can be achieved with the compensation of the closed loop of the flow rate