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A hierarchical distributed control method for I–V droop-controlled-paralleled DC–DC converters in DC microgrid is proposed. The control structure includes primary, secondary, and tertiary levels. The secondary control level is used to remove the DC voltage deviation and improve the current sharing accuracy. An improved dynamic consensus algorithm is used in the secondary control to calculate the average values of bus voltage and voltage restoration in distributed control. In the tertiary control level, as the main contribution in this study, the system conversion efficiency is enhanced by using the average restoration value obtained in the secondary control level, instead of using the total load current which needs more communication traffic. When the converters are connected to batteries, the method for the state of charge (SoC) management is proposed so that the SoC balance can be guaranteed. The effectiveness of the proposed method is verified by detailed experimental tests based on four 0.7 kW DC–DC converters.
Haojie Wang; Minxiao Han; Josep M. Guerrero; Juan C. Vasquez; Bitew G. Teshager. Distributed secondary and tertiary controls for I–V droop‐controlled‐paralleled DC–DC converters. IET Generation, Transmission & Distribution 2018, 12, 1538 -1546.
AMA StyleHaojie Wang, Minxiao Han, Josep M. Guerrero, Juan C. Vasquez, Bitew G. Teshager. Distributed secondary and tertiary controls for I–V droop‐controlled‐paralleled DC–DC converters. IET Generation, Transmission & Distribution. 2018; 12 (7):1538-1546.
Chicago/Turabian StyleHaojie Wang; Minxiao Han; Josep M. Guerrero; Juan C. Vasquez; Bitew G. Teshager. 2018. "Distributed secondary and tertiary controls for I–V droop‐controlled‐paralleled DC–DC converters." IET Generation, Transmission & Distribution 12, no. 7: 1538-1546.
It is a common practice for storage batteries to be connected to DC microgrid buses through DC-DC converters for voltage support on islanded operation mode. A feed-forward control based dual-loop constant voltage PI control for three-branch interleaved DC-DC converters (TIDC) is proposed for storage batteries in DC microgrids. The working principle of TIDC is analyzed, and the factors influencing the response rate based on the dual-loop constant voltage control for TIDC are discussed, and then the method of feed-forward control for TIDC is studied to improve the response rate for load changing. A prototype of the TIDC is developed and an experimental platform is built. The experiment results show that DC bus voltage sags or swells caused by load changing can be reduced and the time for voltage recovery can be decreased significantly with the proposed feed-forward control.
Haojie Wang; Minxiao Han; Wenli Yan; Guopeng Zhao; Josep M. Guerrero. A Feed-Forward Control Realizing Fast Response for Three-Branch Interleaved DC-DC Converter in DC Microgrid. Energies 2016, 9, 529 .
AMA StyleHaojie Wang, Minxiao Han, Wenli Yan, Guopeng Zhao, Josep M. Guerrero. A Feed-Forward Control Realizing Fast Response for Three-Branch Interleaved DC-DC Converter in DC Microgrid. Energies. 2016; 9 (7):529.
Chicago/Turabian StyleHaojie Wang; Minxiao Han; Wenli Yan; Guopeng Zhao; Josep M. Guerrero. 2016. "A Feed-Forward Control Realizing Fast Response for Three-Branch Interleaved DC-DC Converter in DC Microgrid." Energies 9, no. 7: 529.