Control System of Photovoltaic Energy Storage Quasi-Z-source Grid-connected Inverter Applying Lyapunov Control Strategy

doi:10.12204/j.issn.1000-7229.2023.02.011

Abstract

Abstract:

The use of energy storage quasi-Z-source inverter (qZSI) in photovoltaic power generation can reduce power fluctuations, but for nonlinear energy storage qZSI, linear PI control strategy is often used, which is difficult to achieve the ideal control performance. Therefore, an energy storage qZSI control system based on nonlinear Lyapunov control is proposed in this paper. Firstly, the energy management system of energy storage unit is designed to meet load power requirement. Then, according to Lyapunov theory, the energy storage function and control law are designed for energy storage qZSI system, and the appropriate Lyapunov control gain is selected. Finally, on Matlab/Simulink simulation platform, the performance of Lyapunov control system and traditional PI control system are simulated and compared under four different working conditions. The results show that Lyapunov control system has faster response, higher control accuracy and stronger robustness.

Key words: photovoltaic, energy storage qZSI, energy management system, Lyapunov control, PI control

CLC Number:

TM464

ZHENG Huaihua, MAO Yu, CHENG Qiming, CHEN Haiyan. Control System of Photovoltaic Energy Storage Quasi-Z-source Grid-connected Inverter Applying Lyapunov Control Strategy[J]. ELECTRIC POWER CONSTRUCTION, 2023, 44(2): 110-121.

Figures/Tables 16

Fig.1 System structure of grid-connected PV energy storage qZSI

Fig.2 Circuit of two working states of energy storage qZSI

Table 1 Working modes of grid-connected PV energy storage qZSI

Fig.3 Flow chart of control algorithm for energy management system

Fig.4 Graph of φ 1 m i n versus γ 1

Fig.5 Overall structure of Lyapunov control system for PV energy storage qZSI

Table 2 Experimental parameters of the system

Fig.6 Lyapunov control curves of energy storage qZSI under normal steady state

Fig.7 Lyapunov control curves of energy storage qZSI under light intensity change

Fig.8 Lyapunov control curves of energy storage qZSI under no-light condition at night (system working mode 4)

Fig.9 Lyapunov control curves of energy storage qZSI under no-light condition at night (system working mode 5)

Fig.10 Lyapunov control curves of energy storage qZSI under grid power change

Fig.11 THD of three-phase output currents of energy storage qZSI with two control strategies under steady-state conditions

Table 3 THD of three-phase currents with two control strategies under steady-state conditions

Fig.12 Active power of energy storage qZSI with two control strategies under dynamic conditions

Table 4 Active power control index with two control strategies under dynamic conditions

References 16

[1]	何玉鹏, 王杰, 董颖华, 等. 配电网中的分布式光伏系统发电性能仿真[J]. 中国电力, 2021, 54(2): 127-132.
	HE Yupeng, WANG Jie, DONG Yinghua, et al. Simulation of operational performance of PV systems in distribution network[J]. Electric Power, 2021, 54(2): 127-132.
[2]	肖瑶, 钮文泽, 魏高升, 等. 太阳能光伏/光热技术研究现状与发展趋势综述[J]. 发电技术, 2022, 43(3): 392-404. doi: 10.12096/j.2096-4528.pgt.21145
	XIAO Yao, NIU Wenze, WEI Gaosheng, et al. Review on research status and developing tendency of solar photovoltaic/thermal technology[J]. Power Generation Technology, 2022, 43(3): 392-404. doi: 10.12096/j.2096-4528.pgt.21145
[3]	郭勇, 李勇, 皇甫星星, 等. 两级式光伏发电系统低电压穿越控制策略研究[J]. 电力工程技术, 2017, 36(6): 7-13.
	GUO Yong, LI Yong, HUANGFU Xingxing, et al. LVRT control strategy of two-stage PV power system[J]. Electric Power Engineering Technology, 2017, 36(6): 7-13.
[4]	CHUB A, VINNIKOV D, KOSENKO R, et al. Bidirectional DC-DC converter for modular residential battery energy storage systems[J]. IEEE Transactions on Industrial Electronics, 2020, 67(3): 1944-1955. doi: 10.1109/TIE.2019.2902828 URL
[5]	杨峰峰, 杨旭红. 基于LCL滤波有源阻尼控制的Z源逆变器并网研究[J]. 电力系统保护与控制, 2018, 46(5): 38-45.
	YANG Fengfeng, YANG Xuhong. Research on Z-source inverter grid-connected system based on LCL filter of active damping control[J]. Power System Protection and Control, 2018, 46(5): 38-45.
[6]	胡斯登, 梁梓鹏, 范栋琦, 等. 基于Z源变换器的电动汽车超级电容-电池混合储能系统[J]. 电工技术学报, 2017, 32(8): 247-255.
	HU Sideng, LIANG Zipeng, FAN Dongqi, et al. Implementation of Z-source converter for ultracapacitor-battery hybrid energy storage system for electric vehicle[J]. Transactions of China Electrotechnical Society, 2017, 32(8): 247-255.
[7]	HU S D, LIANG Z P, HE X N. Research on the dynamic characteristics and regulation method of the energy stored quasi-Z-source inverter system[J]. IEEE Transactions on Industrial Electronics, 2020, 67(6): 4590-4599. doi: 10.1109/TIE.2019.2931244 URL
[8]	SATHISHKUMAR R, MALATHI V, SAKTHIVEL E. Real time implementation of quazi Z-source inverter incorporated with renewable energy source[J]. Energy Procedia, 2017, 117: 927-934. doi: 10.1016/j.egypro.2017.05.212 URL
[9]	HONARBARI S, ALIZADEH BIDGOLI M. Designing a quasi-Z-source inverter with energy storage to improve grid power quality[J]. IETE Journal of Research, 2022, 68(4): 2445-2453. doi: 10.1080/03772063.2019.1709571 URL
[10]	LIU Y S, GE B M, ABU-RUB H, et al. Control system design of battery-assisted quasi-Z-source inverter for grid-Tie photovoltaic power generation[J]. IEEE Transactions on Sustainable Energy, 2013, 4(4): 994-1001. doi: 10.1109/TSTE.2013.2263202 URL
[11]	方番, 李媛. 储能型准Z源逆变器的积分滑模电流控制策略[J]. 电网技术, 2018, 42(9): 2967-2975.
	FANG Fan, LI Yuan. Integrated sliding-mode current control strategy for energy-stored quasi-Z-source inverter[J]. Power System Technology, 2018, 42(9): 2967-2975.
[12]	LASHAB A, SERA D, MARTINS J, et al. Model predictive-based direct battery control in PV fed quasi Z-source inverters[C]// 2018 5th International Symposium on Environment-Friendly Energies and Applications (EFEA). Rome, Italy: IEEE, 2018: 1-6.
[13]	鲍克勤, 陈海燕, 程启明, 等. 基于无源性理论的光伏储能型准Z源并网逆变器控制方法研究[J]. 智慧电力, 2022, 50(2): 35-41.
	BAO Keqin, CHEN Haiyan, CHENG Qiming, et al. Control method of photovoltaic energy storage quasi-Z-source grid-connected inverter based on passive theory[J]. Smart Power, 2022, 50(2): 35-41.
[14]	薛花, 范月, 王育飞. 基于李雅普诺夫函数的并联型混合有源电力滤波器非线性控制方法[J]. 电工技术学报, 2016, 31(21): 133-141.
	XUE Hua, FAN Yue, WANG Yufei. Nonlinear control strategy based on Lyapunov function for shunt hybrid active power filter[J]. Transactions of China Electrotechnical Society, 2016, 31(21): 133-141.
[15]	宋国杰, 李国进, 杨浩, 等. 基于李雅普诺夫函数的微电网下并网逆变器的自适应控制[J]. 高电压技术, 2020, 46(12): 4455-4463.
	SONG Guojie, LI Guojin, YANG Hao, et al. Adaptive control of grid-connected inverter in microgrid based on Lyapunov function[J]. High Voltage Engineering, 2020, 46(12): 4455-4463.
[16]	莫栋成, 程启明, 陈颖, 等. 不平衡电网电压下MMC-UPQC的Lyapunov函数控制方法[J/OL]. 高电压技术, 2022 (2022-03-28)[2022-05-03]. https://doi.org/10.13336/j.1003-6520.hve.20211705.
	MO Tongcheng, CHENG Qiming, CHEN Ying, et al. Lyapunov function control method for MMC-UPQC under unbalanced network voltage[J/OL]. High Voltage Technology, 2022 (2022-03-28)[2022-05-03]. https://doi.org/10.13336/j.1003-6520.hve.20211705.