Document Type : Review paper
Authors
1 Department of Electrical Engineering, Government Engineering College, Thrissur
2 Affiliated to APJ Abdul Kalam Technological University, Kerala, India.
3 Affiliated to APJ Abdul Kalam Technological University, Kerala, India
Abstract
DC Microgrid is turning out to be more popular due to its appealing features such as high efficiency, excellent power quality, low cost and controllability. As the control strategies plays a key role in achieving the desired objectives such as power quality, power sharing, voltage regulation and efficiency. It is necessary to understand the classification and operation of control strategies in DC microgrids. From the control point of view, the traditional droop control methods are commonly employed for regulating proportional load sharing. However, depending on the primary control makes it challenging to maintain stable and coordinated operation in terms of maintaining both the voltage regulation and load sharing accuracy simultaneously in DC microgrids. So to avoid the trade-off in voltage regulation and power sharing accuracy, secondary control layers need to be introduced in the control structure. In this paper a review of primary control and secondary control methods (centralized, decentralized and distributed control) were discussed in detail with the classification along with the advantages and shortcomings of the control methods.
Keywords
- A. Samarat, B. Mehta, and S. Joshi, "Analysis and modeling of ac and dc micro-grids for prosumer based implementation," J. of Oper. and Autom. Power Eng., vol. 9, no. 2, pp. 116-122, 2021.
- S. Whaite, B. Grainger, and A. Kwasinski, "Power quality in dc power distribution systems and microgrids," Energies, vol. 8, no. 5, pp. 4378-4399, 2015.
- T. Dragi, X. Lu, J. C. Vasquez, and J. M. Guerrero, "Dc microgrids—part ii: A review of power architectures, applications, and standardization issues," IEEE Trans. on Power Electron, vol. 31, no. 5, pp. 3528-3549, 2015.
- S. K. Mazumder, M. Tahir, and K. Acharya, "Master-slave current-sharing
control of a parallel dc-dc converter system over an rf communication
interface," emph{IEEE Trans. Ind. Electron }, vol. 55,
no. 1, pp. 59-66, 2008. - M. Zolfaghari, G. B~Gharehpetian, and M. Abedi, "A repetitive control-based
approach for power sharing among boost converters in dc microgrids,"
emph{J. of Oper. and Autom. Power Eng.}, vol. 7,
no. 2, pp. 168-175, 2019. - G. Xu, D. Sha, and X. Liao, "Decentralized inverse-droop control for
input-series-output-parallel dc-dc converters," emph{IEEE Trans. on
Power Electro}, vol. 30, no. 9, pp. 4621-4625, 2015. - J.-W. Kim, H.-S. Choi, and B. H. Cho, "A novel droop method for converter
parallel operation," emph{IEEE Trans. on Power Electron}, vol. 17,
no. 1, pp. 25-32, 2002. - H. Kakigano, Y. Miura, and T. Ise, "Distribution voltage control for dc
microgrids using fuzzy control and gain-scheduling technique," emph{IEEE
Trans. on Power Electron}, vol. 28, no. 5, pp. 2246-2258, 2012. - F. Chen, R. Burgos, D. Boroyevich, and W. Zhang, "A nonlinear droop method to
improve voltage regulation and load sharing in dc systems," in emph{2015
IEEE First International Conf. on DC Microgrids (ICDCM)}.hskip 1em plus
0.5em minus 0.4emrelax IEEE, 2015, pp. 45-50. - F. Gao, R. Kang, J. Cao, and T. Yang, "Primary and secondary control in dc
microgrids: a review," emph{J. Mod. Power Syst. Clean Energy}, vol. 7, no. 2, pp. 227-242, 2019. - M. Mokhtar, M. I. Marei, and A. A. El-Sattar, "An adaptive droop control
scheme for dc microgrids integrating sliding mode voltage and current
controlled boost converters," emph{IEEE Trans. on Smart Grid},
vol. 10, no. 2, pp. 1685-1693, 2017. - M. Mokhtar, M. I. Marei & A. A. El-Sattar, "Improved current sharing techniques for dc microgrids,"
emph{Electric Power Components and Syst}, vol. 46, no. 7, pp. 757-767,
2018. - F. Li, Z. Lin, Z. Qian, J. Wu, and W. Jiang, "A dual-window dc bus interacting
method for dc microgrids hierarchical control scheme," emph{IEEE
Trans. on Sustainable Energy}, vol. 11, no. 2, pp. 652-661, 2019. - L. Che, M. Shahidehpour, A. Alabdulwahab, and Y. Al-Turki, "Hierarchical
coordination of a community microgrid with ac and dc microgrids," emph{IEEE
Trans. on smart grid}, vol. 6, no. 6, pp. 3042-3051, 2015. - Q. Shafiee, T. Dragi{v{c}}evi{'c}, J. C. Vasquez, and J. M. Guerrero,
"Hierarchical control for multiple dc-microgrids clusters," emph{IEEE Trans. Energy Convers}, vol. 29, no. 4, pp. 922-933, 2014. - C. Jin, P. Wang, J. Xiao, Y. Tang, and F. H. Choo, "Implementation of
hierarchical control in dc microgrids," emph{IEEE Trans. Ind. Electron}, vol. 61, no. 8, pp. 4032-4042, 2013. - Y. Gu, H. Yang, W. Sun, Y. Chi, W. Li, and X. He, "Hierarchical control of dc
microgrids robustness and smartness," emph{CSEE J. Power Energy Syst}, vol. 6, no. 2, pp. 384-393, 2019. - P. Nahata, A. La~Bella, R. Scattolini, and G. Ferrari-Trecate, "Hierarchical
control in islanded dc microgrids with flexible structures," emph{IEEE Trans. Control Syst. Technol.}, 2020. - S. Moayedi and A. Davoudi, "Distributed tertiary control of dc microgrid
clusters," emph{IEEE Trans. on Power Electro}, vol. 31, no. 2,
pp. 1717-1733, 2015. - P. Ghalebani and M. Niasati, "A distributed control strategy based on droop
control and low-bandwidth communication in dc microgrids with increased
accuracy of load sharing," emph{Sustainable Cities Soc.}, vol. 40,
pp. 155-164, 2018. - P. C. Loh, F. Blaabjerg, S. Peyghami-Akhuleh, and H. Mokhtari, "Distributed
secondary control in dc microgrids with low-bandwidth communication link,"
in emph{2016 7th Power Electronics and Drive Systems Technologies Conf.
(PEDSTC)}.hskip 1em plus 0.5em minus 0.4emrelax IEEE, 2016, pp. 641-645. - X. Lu, J. M. Guerrero, K. Sun, and J. C. Vasquez, "An improved droop control
method for dc microgrids based on low bandwidth communication with dc bus
voltage restoration and enhanced current sharing accuracy," emph{IEEE
Trans. on Power Electron}, vol. 29, no. 4, pp. 1800-1812, 2013. - S. Liu, H. You, J. Li, S. Kai, and L. Yang, "Active disturbance rejection
control based distributed secondary control for a low-voltage dc microgrid,"
emph{Sustainable Energy Grids Networks}, p. 100515, 2021. - P. Wang, X. Lu, X. Yang, W. Wang, and D. Xu, "An improved distributed
secondary control method for dc microgrids with enhanced dynamic current
sharing performance," emph{IEEE Trans. on Power Electron},
vol. 31, no. 9, pp. 6658-6673, 2015. - Y. Han, X. Ning, L. Li, P. Yang, and F. Blaabjerg, "Droop coefficient
correction control for power sharing and voltage restoration in hierarchical
controlled dc microgrids," emph{Int. J. Electr. Power Energy Syst}, vol. 133, p. 107277, 2021. - M. M. Shebani, M. T. Iqbal, and J. E. Quaicoe, "Control algorithm for equal
current sharing between parallel-connected boost converters in a dc
microgrid," emph{J. Electr. Comput. Eng.}, vol.
2020, 2020. - Y. Mi, J. Guo, S. Yu, P. Cai, L. Ji, Y. Wang, D. Yue, Y. Fu, and C. Jin, "A
power sharing strategy for islanded dc microgrid with unmatched line
impedance and local load," emph{Electr. Power Syst. Res.}, vol. 192,
p. 106983, 2021. - A. Ingle, A. Shyam, S. R. Sahoo, and S. Anand, "Quality-index based
distributed secondary controller for a low-voltage dc microgrid," emph{IEEE
Trans. Ind. Electron}, vol. 65, no. 9, pp. 7004-7014,
2018. - J. Lai, H. Zhou, X. Lu, X. Yu, and W. Hu, "Droop-based distributed cooperative
control for microgrids with time-varying delays," emph{IEEE Trans. on
Smart Grid}, vol. 7, no. 4, pp. 1775-1789, 2016. - S. Anand, B. G. Fernandes, and J. Guerrero, "Distributed control to ensure
proportional load sharing and improve voltage regulation in low-voltage dc
microgrids," emph{IEEE Trans. on power Electron}, vol. 28, no. 4,
pp. 1900-1913, 2012. - N. Ghanbari and S. Bhattacharya, "Adaptive droop control method for
suppressing circulating currents in dc microgrids," emph{IEEE Open Access
J. of Power Energy}, vol. 7, pp. 100-110, 2020. - S. Augustine, M. K. Mishra, and N. Lakshminarasamma, "Adaptive droop control
strategy for load sharing and circulating current minimization in low-voltage
standalone dc microgrid," emph{IEEE Trans. on Sustainable Energy},
vol. 6, no. 1, pp. 132-141, 2014. - F. Gao, S. Bozhko, and P. Wheeler, "An enhanced secondary control approach for
voltage restoration in the dc distribution system," SAE Technical Paper,
Tech. Rep., 2016. - A. Tah and D. Das, "An enhanced droop control method for accurate load sharing
and voltage improvement of isolated and interconnected dc microgrids,"
emph{IEEE Trans. on Sustainable Energy}, vol. 7, no. 3, pp.
1194-1204, 2016. - P. Prabhakaran, Y. Goyal, and V. Agarwal, "A novel communication-based average
voltage regulation scheme for a droop controlled dc microgrid," emph{IEEE
Trans. on Smart Grid}, vol. 10, no. 2, pp. 1250-1258, 2017. - W. W. A. Silva, T. R. Oliveira, and P. F. Donoso-Garcia, "An improved
voltage-shifting strategy to attain concomitant accurate power sharing and
voltage restoration in droop-controlled dc microgrids," emph{IEEE
Trans. on Power Electron}, vol. 36, no. 2, pp. 2396-2406, 2020. - W. W. A. da~Silva, T. R. Oliveira, and P. F. Donoso-Garcia, "Hybrid
distributed and decentralized secondary control strategy to attain accurate
power sharing and improved voltage restoration in dc microgrids," emph{IEEE
Trans. on Power Electron}, vol. 35, no. 6, pp. 6458-6469, 2019. - D.-H. Dam and H.-H. Lee, "A power distributed control method for proportional
load power sharing and bus voltage restoration in a dc microgrid,"
emph{IEEE Trans. on ind. appl }, vol. 54, no. 4, pp.
3616-3625, 2018. - D.-L. Nguyen and H.-H. Lee, "Fuzzy pid controller for accurate power sharing
and voltage restoration in dc microgrids," in emph{International Conf.
on Intelligent Computing}.hskip 1em plus 0.5em minus 0.4emrelax Springer,
2021, pp. 222-232. - V. Nasirian, S. Moayedi, A. Davoudi, and F. L. Lewis, "Distributed cooperative
control of dc microgrids," emph{IEEE Trans. on Power Electron},
vol. 30, no. 4, pp. 2288-2303, 2014. - S. Islam, S. De, S. Anand, and S. R. Sahoo, "Consensus based ideal current
sharing controller for dc microgrid," in emph{2020 IEEE 14th International
Conf. on Compatibility, Power Electronics and Power Engineering
(CPE-POWERENG)}, vol. 1.hskip 1em plus 0.5em minus 0.4emrelax IEEE, 2020,
pp. 200-205. - J. Qin and H. Gao, "A sufficient condition for convergence of sampled-data
consensus for double-integrator dynamics with nonuniform and time-varying
communication delays," emph{IEEE Trans. on Automa. Control},
vol. 57, no. 9, pp. 2417-2422, 2012. - X. Yi, K. Liu, D. V. Dimarogonas, and K. H. Johansson, "Distributed dynamic
event-triggered control for multi-agent systems," in emph{2017 IEEE 56th
Annual Conf. on Decision and Control (CDC)}.hskip 1em plus 0.5em minus
0.4emrelax IEEE, 2017, pp. 6683-6698. - D. Pullaguram, S. Mishra, and N. Senroy, "Event-triggered communication based
distributed control scheme for dc microgrid," emph{IEEE Trans. on
Power Syst}, vol. 33, no. 5, pp. 5583-5593, 2018. - L. Xing, Q. Xu, F. Guo, Z.-G. Wu, and M. Liu, "Distributed secondary control
for dc microgrid with event-triggered signal transmissions," emph{IEEE
Trans. on Sustainable Energy}, 2021. - J. Zhou, Y. Xu, H. Sun, L. Wang, and M.-Y. Chow, "Distributed event-triggered
$ h_{infty} $ consensus based current sharing control of dc microgrids
considering uncertainties," emph{IEEE Trans. Ind.
Inf.}, vol. 16, no. 12, pp. 7413-7425, 2019. - F. Guo, L. Wang, C. Wen, D. Zhang, and Q. Xu, "Distributed voltage restoration
and current sharing control in islanded dc microgrid systems without
continuous communication," emph{IEEE Trans. Ind. Electro }, vol. 67, no. 4, pp. 3043-3053, 2019. - L. Wang and F. Xiao, "Finite-time consensus problems for networks of dynamic
agents," emph{IEEE Trans. Autom. Control}, vol. 55, no. 4, pp.
950-955, 2010. - P. Wang, R. Huang, M. Zaery, W. Wang, and D. Xu, "A fully distributed
fixed-time secondary controller for dc microgrids," emph{IEEE Trans. Ind. Appl.}, vol. 56, no. 6, pp. 6586-6597, 2020. - L. Zhang, T. Wu, Y. Xing, K. Sun, and J. M. Gurrero, "Power control of dc
microgrid using dc bus signaling," in emph{2011 Twenty-Sixth Annual IEEE
Applied Power Electronics Conf. and Exposition (APEC)}.hskip 1em plus
0.5em minus 0.4emrelax IEEE, 2011, pp. 1926-1932. - T. Dragi{v{c}}evi{'c}, J. M. Guerrero, and J. C. Vasquez, "A distributed
control strategy for coordination of an autonomous lvdc microgrid based on
power-line signaling," emph{IEEE Trans. Ind. Electron},
vol. 61, no. 7, pp. 3313-3326, 2013.