Abstract: The quality of the output electric energy of the independent excitation DC power generation system (IEDGS) depends on its voltage control performance. However, the voltage closed-loop control (VCC) based on proportional integral (PI) regulation has a slow output response and a large overshoot in recovery waveform. Besides, the traditional method based on capacitor energy control (CEC) has a contradiction between the integral coefficient of the outer loop and the feedback of the load current, which affects the steady-state accuracy of the output voltage. To solve these problems, this paper proposes an outer loop single proportional adjustment control strategy based on CEC. First, only proportional control is used in the outer loop to avoid system overshoot caused by capacitor energy storage error integration. Then, based on capacitor charge balance control (CBC), dynamic process linear control is used to calculate the fastest linear rising slope of excitation current and determine the outer loop proportional coefficient, thereby optimizing the system's dynamic response for maximum speed. Finally, the effectiveness of the proposed control strategy is verified through experiments. Results show that proposed control method has excellent dynamic performance and high steady-state voltage accuracy.