DC-Bus Voltage Oscillation Suppressor Based on Active Capacitor and Its Control Method

doi:10.16183/j.cnki.jsjtu.2023.327

Abstract

Abstract:

The constant power load (CPL) in a DC microgrid can reduce the effective damping of the system, resulting in high frequency voltage oscillations on the DC bus, which threatens the safe and stable operation of the system. To address this issue, this paper proposes a DC-bus voltage oscillation suppressor based on an active capacitor and its control method. The oscillation suppressor is connected in parallel to the DC bus, enabling direct interaction with the DC bus. The energy storage capacitor in the oscillator suppressor effectively stores the transient energy generated by voltage oscillations, thereby reducing the amplitude of voltage oscillation and improving the voltage stability of the bus. The voltage of the power supply in the oscillation suppressor adapts to the voltage of the DC bus, allowing for stable operation in the face of load changes in the system. The design offers advantages such as plug-and-play functionality, strong applicability, and flexible control. In addition, by analyzing the operating mode and mechanism of the oscillation suppressor, a small signal model is established, and the influence of controller parameters on the stability and dynamic performance of the suppressor is analyzed, based on which the controller parameter optimization scheme is proposed. Finally, the effectiveness of the oscillatory suppressor is validated through the experimental results.

Key words: DC microgrid, constant power load (CPL), small signal model, oscillation suppressor, parameter optimization

CLC Number:

TM46

YANG Jipei, YANG Ling, WEI Maohua. DC-Bus Voltage Oscillation Suppressor Based on Active Capacitor and Its Control Method[J]. Journal of Shanghai Jiao Tong University, 2025, 59(3): 303-312.

Figures/Tables 13

Fig.1

Fig.2

Fig.3

Fig.4

Fig.5

Fig.6

Fig.7

Tab.1

Tab.2

Fig.8

Fig.9

Fig.10

Fig.11

References 21

[1]	张珍睿, 刘彦呈, 杨鹏明, 等. 直流供电下的永磁同步电机驱动系统母线电压振荡抑制策略[J]. 电工技术学报, 2022, 37(12): 2982-2991.
	ZHANG Zhenrui, LIU Yancheng, YANG Pengming, et al. Suppression strategy of bus voltage oscillation for PMSM in DC power supply drive system[J]. Transactions of China Electrotechnical Society, 2022, 37(12): 2982-2991.
[2]	朱晓荣, 李铮. 多换流器直流微电网稳定性分析[J]. 电网技术, 2021, 45(4): 1400-1410.
	ZHU Xiaorong, LI Zheng. Stability analysis of multi converter DC microgrid[J]. Power System Technology, 2021, 45(4): 1400-1410.
[3]	王昊, 黄文焘, 邰能灵, 等. 直流配网多滤波器交互影响机理分析[J]. 上海交通大学学报, 2023, 57(4): 393-402. doi: 10.16183/j.cnki.jsjtu.2021.423
	WANG Hao, HUANG Wentao, TAI Nengling, et al. Interaction mechanism for multiple active power filters in DC distribution networks[J]. Journal of Shanghai Jiao Tong University, 2023, 57(4): 393-402.
[4]	王一凡, 赵成勇, 郭春义. 双馈风电场孤岛经模块化多电平换流器直流输电并网系统小信号稳定性分析与振荡抑制方法[J]. 电工技术学报, 2019, 34(10): 2116-2129.
	WANG Yifan, ZHAO Chengyong, GUO Chunyi. Small signal stability and oscillation suppression method for islanded double fed induction generator-based wind farm integrated by modular multilevel converter based HVDC system[J]. Transactions of China Electrotechnical Society, 2019, 34(10): 2116-2129.
[5]	郭力, 冯怿彬, 李霞林, 等. 直流微电网稳定性分析及阻尼控制方法研究[J]. 中国电机工程学报, 2016, 36(4): 927-936.
	GUO Li, FENG Yibin, LI Xialin, et al. Stability analysis and research of active damping method for DC microgrids[J]. Proceedings of the CSEE, 2016, 36(4): 927-936.
[6]	ZHAO W, CHEN E D, SUN X F, et al. A 6n-order low-frequency mathematical model of multiple inverters based microgrid[J]. CES Transactions on Electrical Machines and Systems, 2018, 2(3): 264-275.
[7]	钟志宏, 方晓春, 林飞, 等. MTPA控制下逆变器-IPMSM系统直流侧电压稳定性研究[J]. 电工技术学报, 2017, 32(21): 34-43.
	ZHONG Zhihong, FANG Xiaochun, LIN Fei, et al. DC voltage stability studies with IPMSM system under the control of MTPA[J]. Transactions of China Electrotechnical Society, 2017, 32(21): 34-43.
[8]	LI C, YANG Y Q, DRAGICEVIC T, et al. A new perspective for relating virtual inertia with wideband oscillation of voltage in low-inertia DC microgrid[J]. IEEE Transactions on Industrial Electronics, 2022, 69(7): 7029-7039.
[9]	王成山, 李微, 王议锋, 等. 直流微电网母线电压波动分类及抑制方法综述[J]. 中国电机工程学报, 2017, 37(1): 84-98.
	WANG Chengshan, LI Wei, WANG Yifeng, et al. DC bus voltage fluctuation classification and restraint methods review for DC microgrid[J]. Proceedings of the CSEE, 2017, 37(1): 84-98.
[10]	ZHU X R, MENG F Q, XIE Z Y, et al. An inertia and damping control method of DC-DC converter in DC microgrids[J]. IEEE Transactions on Energy Conversion, 2020, 35(2): 799-807.
[11]	GUI Y H, HAN R K, GUERRERO J M, et al. Large-signal stability improvement of DC-DC converters in DC microgrid[J]. IEEE Transactions on Energy Conversion, 2021, 36(3): 2534-2544.
[12]	LU X N, SUN K, GUERRERO J M, et al. Stability enhancement based on virtual impedance for DC microgrids with constant power loads[J]. IEEE Transactions on Smart Grid, 2015, 6(6): 2770-2783.
[13]	XU Q W, VAFAMAND N, CHEN L L, et al. Review on advanced control technologies for bidirectional DC/DC converters in DC microgrids[J]. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2021, 9(2): 1205-1221.
[14]	LI X K, JIANG W T, WANG J J, et al. An autonomous control scheme of global smooth transitions for bidirectional DC-DC converter in DC microgrid[J]. IEEE Transactions on Energy Conversion, 2021, 36(2): 950-960.
[15]	米阳, 张浩杰, 钱翌明, 等. 基于扩散算法的无下垂分布式储能控制[J]. 上海交通大学学报, 2024, 58(6): 836-845. doi: 10.16183/j.cnki.jsjtu.2022.487
	MI Yang, ZHANG Haojie, QIAN Yiming, et al. Droop-free distributed energy storage control based on diffusion algorithm[J]. Journal of Shanghai Jiao Tong University, 2024, 58(6): 836-845.
[16]	杜韦静, 张军明, 钱照明. Buck变流器级联系统直流母线电压补偿控制策略[J]. 电工技术学报, 2015, 30(1): 135-142.
	DU Weijing, ZHANG Junming, QIAN Zhaoming. Compensation methodology for DC bus voltage of cascaded system formed by buck converters[J]. Transactions of China Electrotechnical Society, 2015, 30(1): 135-142.
[17]	张欣, 阮新波. 用于提高级联型电源系统稳定性的自适应有源电容变换器[J]. 电工技术学报, 2012, 27(2): 23-32.
	ZHANG Xin, RUAN Xinbo. Adaptive active capacitor converter for improving the stability of cascaded DC power supply system[J]. Transactions of China Electrotechnical Society, 2012, 27(2): 23-32.
[18]	LI S N, LEE A T L, TAN S C, et al. Plug-and-play voltage ripple mitigator for DC links in hybrid AC-DC power grids with local bus-voltage control[J]. IEEE Transactions on Industrial Electronics, 2018, 65(1): 687-698.
[19]	HAJIHOSSEINI M, ANDALIBI M, GHEISARNEJAD M, et al. DC/DC power converter control-based deep machine learning techniques: Real-time implementation[J]. IEEE Transactions on Power Electronics, 2020, 35(10): 9971-9977.
[20]	HOSSEINIPOUR A, HOJABRI H. Small-signal stability analysis and active damping control of DC microgrids integrated with distributed electric springs[J]. IEEE Transactions on Smart Grid, 2020, 11(5): 3737-3747.
[21]	LUCAS-MARCILLO K E, GUINGLA D A P, BARRA W, et al. Novel robust methodology for controller design aiming to ensure DC microgrid stability under CPL power variation[J]. IEEE Access, 2019, 7: 64206-64222.

子系统	参数	取值
电源模块	U_in/V	120
	L_Boost /μH	300
	C_Boost /mF	3
	L_S /μH	400
	C_S /μF	50
储能模块	C_ST/μF	100
	L_F/μH	900
	C_F/μF	5

子系统控制器	参数	取值
电源模块控制器	U_SREF/V	790
储能模块控制器	$U S T *$ /V	1 000
	k₁	2
	k₂	0.5
	k_p	0.4
	k_i	300