TY - JOUR
T1 - Adaptive-SMC Based Output Impedance Shaping in DC Microgrids Affected by Inverter Loads
AU - Chaturvedi, Shivam
AU - Fulwani, Deepak
AU - Guerrero, Josep M.
N1 - Funding Information:
Manuscript received October 6, 2019; revised February 4, 2020; accepted March 8, 2020. Date of publication March 23, 2020; date of current version September 18, 2020. This work was supported in part by The Ministry of Electronics and Information Technology (Meity), India, in part by SERB, DST India, and in part by VILLUM FONDEN under the VILLUM Investigator Grant (no. 25920): Center for Research on Microgrids (CROM). Paper no. TSTE-01033-2019. (Corresponding author: Deepak Fulwani.) Shivam Chaturvedi and Deepak Fulwani are with the Department of Electrical Engineering, Indian Institute of Technology Jodhpur, Jodhpur 342037, India (e-mail: chaturvedi.1@iitj.ac.in; df@iitj.ac.in).
Publisher Copyright:
© 2010-2012 IEEE.
PY - 2020/10
Y1 - 2020/10
N2 - Inverter connected single-phase AC loads cause second-order oscillations in source currents and DC bus voltage. These oscillations degrade the efficiency and reliability of the dc microgrid. In this paper, an adaptive sliding mode control based output impedance shaping (ASMC-OIS) methodology is proposed for voltage regulation, proportional load sharing, and second-order ripple management in a dc microgrid. By using the proposed control method, the magnitude of the output impedance of the source interfacing converter is increased at 2fac programmably, which results in the reduction of second-order ripple currents propagating through the converter. Instead, it is propagated to the dc-link capacitor or towards the nodes which consists of some ripple absorption active or passive filter. This leads to an increase in the energy density of the ripple filters. The dynamic consensus-based secondary control is incorporated to ensure proportional load current sharing. A graph theoretical analysis is presented to analyze per unit load sharing among all the nodes. Stability of the proposed controller is analyzed considering multiple source nodes using Lyapunov's approach. A dc microgrid consisting of parallel-connected dc-dc boost converters, dc load, and inverter load is simulated to verify the proposed control strategy. The proposed ASMC-OIS methodology is validated through experimentation.
AB - Inverter connected single-phase AC loads cause second-order oscillations in source currents and DC bus voltage. These oscillations degrade the efficiency and reliability of the dc microgrid. In this paper, an adaptive sliding mode control based output impedance shaping (ASMC-OIS) methodology is proposed for voltage regulation, proportional load sharing, and second-order ripple management in a dc microgrid. By using the proposed control method, the magnitude of the output impedance of the source interfacing converter is increased at 2fac programmably, which results in the reduction of second-order ripple currents propagating through the converter. Instead, it is propagated to the dc-link capacitor or towards the nodes which consists of some ripple absorption active or passive filter. This leads to an increase in the energy density of the ripple filters. The dynamic consensus-based secondary control is incorporated to ensure proportional load current sharing. A graph theoretical analysis is presented to analyze per unit load sharing among all the nodes. Stability of the proposed controller is analyzed considering multiple source nodes using Lyapunov's approach. A dc microgrid consisting of parallel-connected dc-dc boost converters, dc load, and inverter load is simulated to verify the proposed control strategy. The proposed ASMC-OIS methodology is validated through experimentation.
KW - adaptive voltage control
KW - dc microgrid
KW - dynamic droop control
KW - hybrid microgrid
KW - proportional current sharing
KW - Second order ripple reduction
UR - http://www.scopus.com/inward/record.url?scp=85089516112&partnerID=8YFLogxK
U2 - 10.1109/TSTE.2020.2982414
DO - 10.1109/TSTE.2020.2982414
M3 - Journal article
AN - SCOPUS:85089516112
SN - 1949-3029
VL - 11
SP - 2940
EP - 2949
JO - IEEE Transactions on Sustainable Energy
JF - IEEE Transactions on Sustainable Energy
IS - 4
M1 - 9044419
ER -