@Article{ee.2025.067304,
AUTHOR = {Qiji Dai, Jikai Li, Bohui Ning, Yutao Xu, Chang Liu, Xuan Zhang},
TITLE = {Load Balancing Control Strategy for Multi-Substation Flexible Interconnection Distribution Networks Considering Unbalanced Power Compensation},
JOURNAL = {Energy Engineering},
VOLUME = {122},
YEAR = {2025},
NUMBER = {10},
PAGES = {4061--4080},
URL = {http://www.techscience.com/energy/v122n10/63998},
ISSN = {1546-0118},
ABSTRACT = {Aiming at the challenge of complex load balancing coordination for a three-phase four-leg (3P4L) based multi-ended low voltage flexible DC distribution system (M-LVDC) considering unbalanced power compensation, this paper proposes a phase-split power decoupling unbalanced compensation strategy based load balancing strategy for 3P4L based M-LVDC. Firstly, the topology and operation principle of the 3P4L-based M-LVDC system is introduced, and quasi-proportional resonant (QPR) based phase-split power current control for the 3P4L converter is proposed. Secondly, a load-balancing control strategy considering unbalanced compensation for 3P4L-based M-LVDC is presented, in which the control diagrams for each 3P4L-based converter are detailed. The core idea of the proposed strategy is to comprehensively consider the imbalance compensation and load rate balancing between the two areas to calculate the split-phase power and current reference values of each 3P4L converter and achieve the static error-free tracking of the reference values through the QPR current inner-loop control. These reference values are then tracked with zero steady-state error using QPR current inner-loop control. Finally, the effectiveness of the proposed control strategy is verified through a 3P4L M-LVDC case study conducted on the PSCAD/EMTDC software. The results indicate that the proposed method not only can reduce the three-phase imbalance degrees from >20% to <0.5%, but also achieve excellent balanced load rates, with the load-rate difference smaller than 1.5%.},
DOI = {10.32604/ee.2025.067304}
}