基于并联虚拟电阻的级联DC-DC变换器稳定控制方法

doi:10.19595/j.cnki.1000-6753.tces.190969

Abstract
Figure/Table
References
Related Citation (15)

Download: PDF (82441 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract Cascaded DC-DC converter structure is a common form of DC distributed power systems. A converter designed individually can operate independently and stably. However, it may cause the instability of the whole system due to the interaction between the source and load converter after cascading. In this paper, a cascaded buck converter is taken as an example. The large-signal model is established by state space average method to analyze the open-loop stability of the cascaded system, and the parallel resistance range that can be stable in the full load range is derived. Then the influence of the resistance on the close-loop output impedance of the source converter is analyzed. Accordingly, an active damping control strategy based on paralleling virtual resistor is proposed to improve the stability of the cascaded system. This strategy can meet the stability requirement of matching the input impedance of the load converter without affecting the closed-loop dynamic of the source converter. The Lyapunov indirect method is used to analyze the stability conditions of the control strategy. The reasonable selection of the paralleling virtual resistor can satisfy the stability of the whole system. Finally, the effectiveness of the proposed control strategy is verified by simulation and experiment.

Key words： Cascaded DC-DC converters stability analysis virtual resistor Lyapunov indirect method

Received: 31 July 2019

PACS:

TM46

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	Huang Yuansheng
	Liu Heping
	Miao Yiru
	Liao Jianquan

Cite this article:

Huang Yuansheng,Liu Heping,Miao Yiru等. Cascaded DC-DC Converter Stability Control Method Based on Paralleling Virtual Resistor[J]. Transactions of China Electrotechnical Society, 2020, 35(18): 3927-3937.

URL:

https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.190969 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I18/3927

[1] 姚雨迎, 张东来, 徐殿国. 级联式DC/DC变换器输出阻抗的优化设计与稳定性[J]. 电工技术学报, 2009, 24(3): 147-152.
Yao Yuying, Zhang Donglai, Xu Dianguo.Output impedance optimization and stability for cascade DC/DC converter[J]. Transactions of China Electro- technical Society, 2009, 24(3): 147-152.
[2] Rahimi A M, Emadi A.Active damping in DC/DC power electronic converters: a novel method to over- come the problems of constant power loads[J]. IEEE Transactions on Industrial Electronics, 2009, 56(5): 1428-1439.
[3] Zhang Xin, Ruan Xinbo, Zhong Qingchang.Improving the stability of cascaded DC/DC converter systems via shaping the input impedance of the load converter with a parallel or series virtual impedance[J]. IEEE Transactions on Industrial Electronics, 2015, 62(12): 7499-7512.
[4] 贾鹏宇, 李艳, 郑琼林. 电压型级联系统中减小源变换器输出阻抗的有源阻尼控制方法[J]. 电工技术学报, 2015, 30(8): 71-82.
Jia Pengyu, Li Yan, Zheng Qionglin.An active damping method to reduce output impedance of converters in voltage source cascaded system[J]. Transactions of China Electrotechnical Society, 2015, 30(8): 71-82.
[5] 刘欣博, 高卓. 考虑恒功率负载与储能单元动态特性的直流微电网系统大信号稳定性分析[J]. 电工技术学报, 2019, 34(增刊1): 292-299.
Liu Xinbo, Gao Zhuo.Large signal stability analysis of DC microgrid system considering dynamic characteristics of constant power load and energy storage system[J]. Transactions of China Electro- technical Society, 2019, 34(S1): 292-299.
[6] Middlebrook R D.Input filter considerations in design and application of switching regulators[C]// IEEE IAS Annual Meeting, Chicago, 1976: 366-382.
[7] Cespedes M, Xing Lei, Sun Jian.Constant-power load system stabilization by passive damping[J]. IEEE Transactions on Power Electronics, 2011, 26(7): 1832-1836.
[8] Zhang Xin, Ruan Xinbo, Hyok Kim.Adaptive active capacitor converter for improving stability of cascaded DC power supply system[J]. IEEE Transa- ctions on Power Electronics, 2013, 28(3): 1807-1816.
[9] Cai Wen, Yi Fan, Eva Cosoroaba, et al.Stability optimization method based on virtual resistor and nonunity voltage feedback loop for cascaded DC/DC converters[J]. IEEE Transactions on Industry Appli- cations, 2015, 51(6): 4575-4583.
[10] Wu Mingfei, Dylan Dah-Chuan Lu. A novel stabili- zation method of LC input filter with constant power loads without load performance compromise in DC microgrids[J]. IEEE Transactions on Industrial Electronics, 2015, 62(7): 4552-4562.
[11] Ahmed Aldhaheri, Amirh Etemadi.Stabilization and performance preservation of DC/DC cascaded systems by diminishing output impedance magnitude[J]. IEEE Transactions on Industry Applications, 2018, 54(2): 1481-1489.
[12] Xin Zhang, Zhong Qingchang, Ming Wenlong.Stabilization of cascaded DC/DC converters via adaptive series-virtual-impedance control of the load converter[J]. IEEE Transactions on Power Electro- nics, 2016, 31(9): 6057-6063.
[13] 滕昌鹏, 王玉斌, 周博恺, 等. 含恒功率负载的直流微网大信号稳定性分析[J]. 电工技术学报, 2019, 34(5): 973-982.
Teng Changpeng, Wang Yubin, Zhou Bokai, et al.Large-signal stability analysis of DC microgrid with constant power loads[J]. Transactions of China Elec- trotechnical Society, 2019, 34(5): 973-982.
[14] 庞圣钊, 皇甫宜耿, 郭亮, 等. 基于Lyapunov间接法分析的恒功率负载电源变换器宽稳定控制策略[J]. 电工技术学报, 2017, 32(14): 146-154.
Pang Shengzhao, Huangfu Yigeng, Guo Liang, et al.A novel wide stability control strategy of constant power load power converter based on the analysis of Lyapunvo indirect method[J]. Transactions of China Electrotechnical Society, 2017, 32(14): 146-154.
[15] Huangfu Yigeng, Pang Shengzhao, Guo Liang, et al.Stability analysis and active stabilization of on-board DC power converter system with input filter[J]. IEEE Transactions on Industrial Electronics, 2018, 65(1): 790-799.
[16] 吴蒙, 贺之渊, 阎发友, 等. 下垂控制对直流电网动态电压稳定性的影响分析[J]. 电力系统保护与控制, 2019, 47(10): 8-15.
Wu Meng, He Zhiyuan, Yan Fayou, et al.Influence of droop control on the dynamic voltage stability of DC grid analysis[J]. Power System Protection and Control, 2019, 47(10): 8-15.