Abstarct: Abstract Accurate power sharing and maintaining the DC bus voltage at the reference value are significant challenges in the control of DC microgrids. Although the droop control method is effective, it faces limitations such as increased DC bus voltage deviation with large droop coefficients and increased power-sharing errors with small droop coefficients. Furthermore, power allocation baxsed on the capacity of distributed generation (DG) units can lead to economically suboptimal power distribution. Additionally, the presence of constant power loads (CPLs), due to the introduction of negative incremental resistance, causes severe DC bus voltage oscillations and ultimately leads to system instability. This thesis proposes a distributed secondary control method for DC microgrids to address these limitations and challenges. The proposed method integrates DC bus voltage recovery with economic load dispatch, considering line losses. The primary objectives are to regulate the DC bus voltage to the reference value and minimize the total power generation cost. Simulations were conducted in the MATLAB/SIMUlixnk environment using a DC microgrid comprising four DG units. The system's performance was evaluated under various load conditions, including resistive loads, CPLs, and hybrid loads. The results demonstrate that the proposed method not only ensures optimal power sharing among DG units baxsed on generation costs but also successfully maintains bus voltage stability and achieves reliable system performance under varying load conditions. Key features of the proposed approach include ease of implementation, fast convergence speed, consideration of line losses, optimal power sharing, and high adaptability to varying and constant power loads.