Abstract
Most of the renewable energy sources in DC microgrids are intermittent in nature, have a slow dynamic response, and lack a power reserve, resulting in power imbalance and difficulty to supply transient power. To address these problems, implementation of a proper transient power management strategy is a must, so that different nature of power demand can be dealt with by competent energy sources. An improved droop control strategy with DC bus signaling (DBS) is proposed in this paper to obtain autonomous transient power management for an islanded or grid-connected DC microgrid, without the use of central controller and communication networks. Furthermore, the proposed improved droop control splits load power into transient power and steady-state power for SC, battery, and grid. Here, virtual impedance droop, acting as a high pass filter, controls the SC converter and makes SC only supply transient power, while virtual resistor droop, behaving as a low pass filter, regulates the battery converter and grid rectifier to provide steady-state average power in islanded and grid-connected modes of the DC microgrid, respectively. In addition, a smooth shift of the DC microgrid from islanded mode to grid-connected mode is facilitated by DBS. And SoC recovery of battery and SC is achieved, and dynamic restoration of DC bus voltage is also obtained. The operational methods of the proposed control strategy, the system detail design, and the impedance analysis are presented. Then, the efficacy of the proposed method and theoretical analyses are validated by results obtained from PLECS simulation and RT box real-time simulation.
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Dragicevic T, Lu X, Vasquez JC, Guerrero JM (2016) DC microgrids—Part I: a review of control strategies and stabilization techniques. IEEE Trans Power Electron 31:4876–4891. https://doi.org/10.1109/TPEL.2015.2478859
Sapkota S, Pokharel K, Wang Y et al (2020) Modified T-source circuit breaker for bidirectional operation in MVDC. In: 2020 IEEE sustainable power and energy conference (iSPEC), pp 813–818
Lopes JAP, Moreira CL, Madureira AG (2006) Defining control strategies for microgrids islanded operation. IEEE Trans Power Syst 21:916–924. https://doi.org/10.1109/TPWRS.2006.873018
Kakigano H, Nomura M, Ise T (2010) Loss evaluation of DC distribution for residential houses compared with AC system. In: 2010 International power electronics conference—ECCE Asia, IPEC 2010. IEEE, pp 480–486
Thounthong P, Luksanasakul A, Koseeyaporn P, Davat B (2013) Intelligent model-based control of a standalone photovoltaic/fuel cell power plant with supercapacitor energy storage. IEEE Trans Sustain Energy 4:240–249. https://doi.org/10.1109/TSTE.2012.2214794
Zhang Y, Wei Li Y (2017) Energy management strategy for supercapacitor in droop-controlled DC microgrid using virtual impedance. IEEE Trans Power Electron 32:2704–2716. https://doi.org/10.1109/TPEL.2016.2571308
Xu Y, Zhang W, Hug G et al (2015) Cooperative control of distributed energy storage systems in a microgrid. IEEE Trans Smart Grid 6:238–248. https://doi.org/10.1109/TSG.2014.2354033
Pokharel K, Sapkota S, Li W et al (2020) Dynamic transient power allocation strategy in on/off-grid DC microgrid. In: 2020 IEEE student conference on electric machines and systems, SCEMS 2020, pp 863–868
Xiao J, Wang P, Setyawan L (2015) Hierarchical control of hybrid energy storage system in DC microgrids. IEEE Trans Ind Electron 62:4915–4924. https://doi.org/10.1109/TIE.2015.2400419
Ribeiro PF, Johnson BK, Crow ML et al (2001) Energy storage systems for advanced power applications. Proc IEEE 89:1744–1756. https://doi.org/10.1109/5.975900
Zandi M, Payman A, Martin JP et al (2011) Energy management of a fuel cell/supercapacitor/battery power source for electric vehicular applications. IEEE Trans Veh Technol 60:433–443. https://doi.org/10.1109/TVT.2010.2091433
Shen J, Khaligh A (2015) A supervisory energy management control strategy in a battery /ultracapacitor hybrid energy storage system. IEEE Trans Transp Electr 1:223–231. https://doi.org/10.1109/TTE.2015.2464690
Liu B, Zhuo F, Zhu Y, Yi H (2015) System operation and energy management of a renewable energy-based DC micro-grid for high penetration depth application. IEEE Trans Smart Grid 6:1147–1155. https://doi.org/10.1109/TSG.2014.2374163
Olivares DE, Mehrizi-Sani A, Etemadi AH et al (2014) Trends in microgrid control. IEEE Trans Smart Grid 5:1905–1919. https://doi.org/10.1109/TSG.2013.2295514
Tang W, Lasseter HR (2000) An LVDC industrial power distribution system without central control unit. In: 2000 IEEE 31st annual power electronics specialists conference. IEEE, Galway, Ireland, pp 979–984
Ito Y, Zhongqing Y, Akagi H (2004) DC micro-grid based distribution power generation system. In: The 4th international power electronics and motion control conference. Xi’an, China, pp 1740–1745
Lu X, Sun K, Guerrero JM et al (2014) State-of-charge balance using adaptive droop control for distributed energy storage systems in DC microgrid applications. IEEE Trans Ind Electron 61:2804–2815. https://doi.org/10.1109/TIE.2013.2279374
Guerrero JM, Chandorkar M, Lee TL, Loh PC (2013) Advanced control architectures for intelligent microgrids—part I: decentralized and hierarchical control. IEEE Trans Ind Electron 60:1254–1262. https://doi.org/10.1109/TIE.2012.2194969
Chen D, Xu L (2012) Autonomous DC voltage control of a DC microgrid with multiple slack terminals. IEEE Trans Power Syst 27:1897–1905. https://doi.org/10.1109/TPWRS.2012.2189441
Kakigano H, Miura Y, Ise T (2010) Low-voltage bipolar-type DC microgrid for super high quality distribution. IEEE Trans Power Electron 25:3066–3075. https://doi.org/10.1109/TPEL.2010.2077682
Zhou H, Bhattacharya T, Tran D et al (2011) Composite energy storage system involving battery and ultracapacitor with dynamic energy management in microgrid applications. IEEE Trans Power Electron 26:923–930. https://doi.org/10.1109/TPEL.2010.2095040
Gu Y, Li W, He X (2015) Frequency-coordinating virtual impedance for autonomous power management of DC microgrid. IEEE Trans Power Electron 30:2328–2337. https://doi.org/10.1109/TPEL.2014.2325856
Schönberger J, Duke R, Round SD (2006) DC-bus signaling: a distributed control strategy for a hybrid renewable nanogrid. IEEE Trans Ind Electron 53:1453–1460. https://doi.org/10.1109/TIE.2006.882012
Sun K, Zhang L, Xing Y, Guerrero JM (2011) A distributed control strategy based on DC bus signaling for modular photovoltaic generation systems with battery energy storage. IEEE Trans Power Electron 26:3032–3045. https://doi.org/10.1109/TPEL.2011.2127488
Xu Q, Xiao J, Wang P et al (2017) A decentralized control strategy for autonomous transient power sharing and state-of-charge recovery in hybrid energy storage systems. IEEE Trans Sustain Energy 8:1443–1452. https://doi.org/10.1109/TSTE.2017.2688391
Xu Q, Xiao J, Hu X et al (2017) A decentralized power management strategy for hybrid energy storage system with autonomous bus voltage restoration and state-of-charge recovery. IEEE Trans Ind Electron 64:7098–7108. https://doi.org/10.1109/TIE.2017.2686303
Chen J, Song Q (2019) A decentralized dynamic load power allocation strategy for fuel cell/supercapacitor-based APU of large more electric vehicles. IEEE Trans Ind Electron 66:865–875. https://doi.org/10.1109/TIE.2018.2833031
Chen J, Song Q, Yin S, Chen J (2020) On the decentralized energy management strategy for the all-electric APU of future more electric aircraft composed of multiple fuel cells and supercapacitors. IEEE Trans Ind Electron 67:6183–6194. https://doi.org/10.1109/TIE.2019.2937069
Chen J, Song Q (2019) A decentralized energy management strategy for a fuel cell/supercapacitor-based auxiliary power unit of a more electric aircraft. IEEE Trans Ind Electron 66:5736–5747. https://doi.org/10.1109/TIE.2018.2866042
Pokharel K, Sapkota S, Wang Y et al (2020) Dynamic transient power sharing in grid-connected DC microgrid. In: 2020 IEEE sustainable power and energy conference (iSPEC). Chengdu, China, pp 826–831
Song Q, Chen J (2018) A decentralized energy management strategy for a battery/supercapacitor hybrid energy storage system in autonomous DC microgrid. In: IEEE international symposium on industrial electronics, pp 19–24. https://doi.org/10.1109/ISIE.2018.8433728
Wu W, Chen Y, Zhou L et al (2018) A virtual phase-lead impedance stability control strategy for the maritime VSC-HVDC system. IEEE Trans Ind Informatics 14:5475–5486. https://doi.org/10.1109/TII.2018.2804670
Acknowledgements
This work is supported: in part by the National Natural Science Foundation of China (Grant No. 51777169), in part by the Fundamental Research Funds for the Central Universities (Grant No. ZDHXYKYYW201914) and in part by the Introduction of Special Funding Project for High-end R & D Institutions of Qingdao Research Institute of Northwestern Polytechnical University.
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Pokharel, K., Li, W., Sapkota, S. et al. Autonomous transient power management strategy based on improved droop control for DC microgrid. Electr Eng 104, 4321–4334 (2022). https://doi.org/10.1007/s00202-022-01602-8
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DOI: https://doi.org/10.1007/s00202-022-01602-8