RESEARCH ON CONTROL STRATEGY OF PV STORAGE DC MICROGRID BASED ON ADAPTIVE DROOP CONTROL

Dai Li; Wang Junrui; Tan Lu; Zhu Xuqiang; Wang Ming; Dou Shuai

doi:10.19912/j.0254-0096.tynxb.2023-0573

PDF(2563 KB)

Acta Energiae Solaris Sinica ›› 2024, Vol. 45 ›› Issue (8) : 154-163. DOI: 10.19912/j.0254-0096.tynxb.2023-0573

RESEARCH ON CONTROL STRATEGY OF PV STORAGE DC MICROGRID BASED ON ADAPTIVE DROOP CONTROL

Dai Li, Wang Junrui, Tan Lu, Zhu Xuqiang, Wang Ming, Dou Shuai

Author information +

History +

Abstract

The introduction of droop control often leads to a drop in bus voltage. In response to this problem, an adaptive droop control （ADC） strategy based on n-th power of batteries state of charge（SOC） is proposed, in which designs the droop coefficient during charging and discharging is designed. In the droop coefficient, the batteries Sn and the droop coefficient adjustment law based on bus voltage are introduced, and supercapacitor power compensation is added. In terms of the coordinated operation control strategy of the system, the upper level coordinated control module is designed with the bus voltageUdc and batteries SOC as control elements.Compared with traditional adaptive droop control, the proposed control strategy can elevte the dropped bus voltage, and when external environmental factor or load changes, the battery-supercapacitor hybrid energy storage system can better maintain the stability of bus voltage and improve the system's anti-interference ability. Moreover, the system can smoothly switch between various working modes to maintain the stability of bus voltage. Finally, the effectiveness of this control strategy is verified on an PV storage DC microgrid experimental platform based on TMS320F28335.

Key words

DC microgrid / energy storage system / adaptive droop control / state of charge / voltage drop / coordinated operation

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

Dai Li, Wang Junrui, Tan Lu, Zhu Xuqiang, Wang Ming, Dou Shuai. RESEARCH ON CONTROL STRATEGY OF PV STORAGE DC MICROGRID BASED ON ADAPTIVE DROOP CONTROL[J]. Acta Energiae Solaris Sinica. 2024, 45(8): 154-163 https://doi.org/10.19912/j.0254-0096.tynxb.2023-0573

References

[1] EZ-ZAHRA LAMZOURI F, BOUFOUNAS E M, EL AMRANI A. Efficient energy management and robust power control of a stand-alone wind-photovoltaic hybrid system with battery storage[J]. Journal of energy storage, 2021, 42: 103044.
[2] GHAITHAN A M, MOHAMMED A, AL-HANBALI A, et al.Multi-objective optimization of a photovoltaic-wind-grid connected system to power reverse osmosis desalination plant[J]. Energy, 2022, 251: 123888.
[3] GHOLAMI K, KARIMI S, RASTGOU A.Fuzzy risk-based framework for scheduling of energy storage systems in photovoltaic-rich networks[J]. Journal of energy storage, 2022, 52: 104902.
[4] 吴青峰, 孙孝峰, 郝彦丛, 等. 微电网储能系统SOC平衡和电压频率恢复研究[J]. 太阳能学报, 2018, 39(6): 1743-1751.
WU Q F, SUN X F, HAO Y C, et al.Research of SOC balance and voltage frequence recovery of microgrid energy storage system[J]. Acta energiae solaris sinica, 2018, 39(6): 1743-1751.
[5] 柴秀慧, 张纯江, 柴建国, 等. 分布式储能变调节因子SOC下垂控制及功率调节[J]. 太阳能学报, 2021, 42(9): 477-482.
CHAI X H, ZHANG C J, CHAI J G, et al.Variable adjustment factor SOC droop control and power regulation in distributed energy storage[J]. Acta energiae solaris sinica, 2021, 42(9): 477-482.
[6] JIANG W B, LI P.A novel pre-synchronization control strategy for microgrid connections based on improved droop control[J]. Energy reports, 2022, 8: 1257-1264.
[7] 胡超, 张兴, 石荣亮, 等. 分布式电源并联系统中基于荷电状态均衡的改进型下垂控制策略[J]. 太阳能学报, 2019, 40(3): 809-816.
HU C, ZHANG X, SHI R L, et al.Improved droop control based on state of charge balance in parallel distributed generation systems[J]. Acta energiae solaris sinica, 2019, 40(3): 809-816.
[8] SHADABI H, KAMWA I.A decentralized non-linear dynamic droop control of a hybrid energy storage system bluefor primary frequency control in integrated AC-MTDC systems[J]. International journal of electrical power & energy systems, 2022, 136: 107630.
[9] WANG S Q, LU L G, HAN X B, et al.Virtual-battery based droop control and energy storage system size optimization of a DC microgrid for electric vehicle fast charging station[J]. Applied energy, 2020, 259: 114146.
[10] XING W, WANG H W, LU L G, et al.An adaptive droop control for distributed battery energy storage systems in microgrids with DAB converters[J]. International journal of electrical power & energy systems, 2021, 130: 106944.
[11] BI K T, YANG W L, XU D Z, et al.Dynamic SOC balance strategy for modular energy storage system based on adaptive droop control[J]. IEEE access, 2020, 8: 41418-41431.
[12] MI Y, DENG J, CHANG J F, et al.State of charge balancing strategy for energy storage system in islanded DC microgrid based on micro-tuning virtual resistance[J]. Electric power systems research, 2022, 209: 107921.
[13] 柴秀慧, 张纯江, 柴建国, 等. 改进互联通信荷电状态下垂控制及功率均衡优化[J]. 电工技术学报, 2021, 36(16): 3365-3374.
CHAI X H, ZHANG C J, CHAI J G, et al.Improved interconnected communication state of charge droop control and power balance optimization[J]. Transactions of China Electrotechnical Society, 2021, 36(16): 3365-3374.
[14] LU X N, SUN K, GUERRERO J M, et al.Double-quadrant state-of-charge-based droop control method for distributed energy storage systems in autonomous DC microgrids[J]. IEEE transactions on smart grid, 2015, 6(1): 147-157.
[15] 袁娜娜, 王允建, 张君, 等. 直流微网中基于SOC的改进下垂控制[J]. 电力系统保护与控制, 2019, 47(15): 17-23.
YUAN N N, WANG Y J, ZHANG J, et al.Improved droop control based on SOC in DC microgrid[J]. Power system protection and control, 2019, 47(15): 17-23.