| Abstract: |
The paper presents a novel approach for advanced DC microgrid architecture along with integrated power quality enhancement strategies to attenuate the persistence challenges of voltage regulation and harmonic distortion along with load sharing in distributed renewable energy systems. Although DC power systems are structurally favorable against the reactive power complexities and multi-stage conversion losses of AC systems, power quality degradation still remains a key operational challenge for DC microgrids. A hierarchical control framework with adaptive droop control, distributed secondary regulation over low-bandwidth communication and active power filter (APF) control for simultaneous voltage regulation and total harmonic distortion (THD) reduction is proposed in this study. These goals should be achieved by integrating secondary voltage–current control with shunt active power filters (APF), will ensure that the deviation of the DC bus voltage remains below 1% and maintains the total harmonic distortion (THD) within 3% limits, as per IEEE 519-2022. A simulation was performed with a 10 kW DC microgrid system using PV, wind, and battery storage resources in MATLAB/Simulink R2024a. Simulation results validate the improved performance over the previous method yielding reductions of bus voltage deviation from 7.4% down to 1.2%, THD from 9.8% down to 2.7%, and power sharing error from 14.8% down to 2.1%. The discussion shows that results are well-aligned with the stated objectives and relevant benchmark literature. This architecture is a potential candidate for smart city and rural electrification applications in India and such other developing economics. |
