Interaction Mechanism for Multiple Active Power Filters in DC Distribution Networks

doi:10.16183/j.cnki.jsjtu.2021.423

Abstract

Abstract:

DC distribution network is the main development direction of the power distribution system. Due to the influence of electronic equipment and other factors, the system is very easy to produce second harmonics, which seriously affects the stability of the system and the safety of electrical equipment. Multi-filter collaborative filtering in DC distribution network has become one of the methods to control the second harmonic. However, due to the coupling interference between the filters, the filtering effect is affected by multiple factors. This paper establishes a Norton equivalent grid-connected model of multiple filters and proposes a method for analyzing the interaction mechanism of multiple filters based on the relative gain matrix theory. This method establishes the matrix relationship between the change in the output current of the filter and the change in the harmonic source current and analyzes the influence of the grid parameters and controller parameters in the multi-filter grid-connected system on the filtering effect of the filter, and proposes a reasonable parameter selection method. Finally, this paper establishes a DC distribution network model with multiple DC filters in PSCAD/EMTDC, and simulates the parameters affecting the filtering effect and verifies the rationality of the analysis in the scenario of multiple harmonic sources. In addition, it builds a semi-physical simulation model in RT-LAB to further verify the effectiveness of the method.

Key words: DC distribution network, second harmonic, DC active filter, relative gain matrix, interaction mechanism

CLC Number:

TM712

WANG Hao, HUANG Wentao, TAI Nengling, YU Moduo, SUN Guoliang. Interaction Mechanism for Multiple Active Power Filters in DC Distribution Networks[J]. Journal of Shanghai Jiao Tong University, 2023, 57(4): 393-402.

Figures/Tables 20

Fig.1

Fig.2

Fig.3

Fig.4

Fig.5

Tab.1

Fig.6

Fig.7

Tab.2

Tab.3

Tab.4

Fig.8

Fig.9

Fig.10

Fig.11

Fig.12

Tab.5

Tab.6

Fig.13

Fig.14

References 17

[1]	刘英培, 周素文, 梁海平, 等. 光储直流配电网灵活虚拟惯性控制策略[J]. 电力自动化设备, 2021, 41(5): 107-113.
	LIU Yingpei, ZHOU Suwen, LIANG Haiping, et al. Flexible virtual inertial control strategy for optical storage DC distribution network[J]. Electric Power Automation Equipment, 2021, 41(5): 107-113.
[2]	戴志辉, 葛红波, 严思齐, 等. 柔性直流配电网故障分析[J]. 电工技术学报, 2018, 33(8): 1863-1874.
	DAI Zhihui, GE Hongbo, YAN Siqi, et al. Failure analysis of flexible DC distribution network[J]. Journal of Electrotechnical Engineering, 2018, 33(8): 1863-1874.
[3]	LIU W. Power quality assessment in shipboard microgrids under unbalanced and harmonic AC bus voltage[J]. IEEE Transactions on Industry Applications, 2019, 55(1): 765-775. doi: 10.1109/TIA.28 URL
[4]	徐辰华, 伍建松, 刘斌, 等. 直流侧电压高二次纹波率条件下的单相逆变器谐波削弱调制[J]. 电力系统自动化, 2020, 44(3): 176-184.
	XU Chenhua, WU Jiansong, LIU Bin, et al. Single-phase inverter harmonic attenuation modulation under the condition of high secondary ripple rate of DC side voltage[J]. Automation of Electric Power Systems, 2020, 44(3): 176-184.
[5]	李占凯, 岳怀瑜, 张福民, 等. 混合微电网虚拟联合谐波抑制器控制策略[J]. 高电压技术, 2020, 46(7): 2307-2315.
	LI Zhankai, YUE Huaiyu, ZHANG Fumin, et al. Control strategy of virtual joint harmonic suppressor for hybrid microgrid[J]. High Voltage Technology, 2020, 46(7): 2307-2315.
[6]	张力, 陈乔夫, 刘健犇, 等. 基于测量值的无源滤波器设计新方法及其应用[J]. 电力自动化设备, 2011, 31(9): 69-74.
	ZHANG Li, CHEN Qiaofu, LIU Jianben, et al. New method and application of passive filter design based on measured value[J]. Electric Power Automation Equipment, 2011, 31(9): 69-74.
[7]	李双健, 贾秀芳. 混合型有源滤波器接入LCC-HVDC后的谐振分析及抑制方法[J]. 高电压技术, 2021, 47(7): 2480-2490.
	LI Shuangjian, JIA Xiufang. Resonance analysis and suppression method of hybrid active filter connected to LCC-HVDC[J]. High Voltage Technology, 2021, 47(7): 2480-2490.
[8]	XUE Y, ZHANG X P, YANG C. AC filterless flexible LCC HVDC with reduced voltage rating of controllable capacitors[J]. IEEE Transactions on Power Systems, 2018, 33(5): 5507-5518. doi: 10.1109/TPWRS.59 URL
[9]	YANG Y, DAVARI P, ZARE F, et al. A DC-link modulation scheme with phase-shifted current control for harmonic cancellations in multidrive applications[J]. IEEE Transactions on Power Electronics, 2016, 30(3): 1837-1840.
[10]	ZHU G, TAN S, CHEN Y, et al. Mitigation of low-frequency current ripple in fuel-cell inverter systems through waveform control[J]. IEEE Transactions on Power Electronics, 2013, 28(2): 779-792. doi: 10.1109/TPEL.2012.2205407 URL
[11]	CAI W, JIANG L, LIU B, et al. A power decoupling method based on four-switch three-port DC-DC-AC converter in DC microgrid[J]. IEEE Transactions on Industry Applications, 2015, 51(1): 336-343. doi: 10.1109/TIA.2014.2327162 URL
[12]	朱银玉. 航空直流有源滤波器的关键技术研究[D]. 南京: 南京航空航天大学, 2010.
	ZHU Yinyu. Research on the key technology of aviation DC active filter[D]. Nanjing: Nanjing University of Aeronautics and Astronautics, 2010.
[13]	郭春林, 徐轩, 张琛亮, 等. 含滤波器的多换流站谐波阻抗模型与谐波交互影响研究[J]. 电力自动化设备, 2020, 40(10): 187-193.
	GUO Chunlin, XU Xuan, ZHANG Chenliang, et al. Research on harmonic impedance model and harmonic interaction of multi-converter stations with filters[J]. Electric Power Automation Equipment, 2020, 40(10): 187-193.
[14]	杨光亮, 邰能灵, 郑晓冬, 等. 多馈入直流输电系统谐波交互影响分析[J]. 电力自动化设备, 2016, 36(1): 105-110.
	YANG Guangliang, TAI Nengling, ZHENG Xiao-dong, et al. Harmonic interaction analysis of multi-infeed DC transmission system[J]. Electric Power Automation Equipment, 2016, 36(1): 105-110.
[15]	DANG P, ELLINGER T, PETZOLDT J. Dynamic interaction analysis of APF systems[J]. IEEE Transactions on Industrial Electronics, 2014, 61(9): 4467-4473. doi: 10.1109/TIE.2013.2289896 URL
[16]	王弈赫, 张佰富, 韩肖清, 等. 基于频域RGA原理的多并联三相逆变器间交互影响分析[J]. 高电压技术, 2021, 47(10): 3766-3778.
	WANG Yihe, ZHANG Baifu, HAN Xiaoqing, et al. Interaction analysis of multi-parallel three-phase inverters based on frequency domain RGA principle[J]. High Voltage Technology, 2021, 47(10): 3766-3778.
[17]	陈继开, 马修伟, 李江, 等. 并联双APF交互影响分析[J]. 电网技术, 2017, 41(3): 956-961.
	CHEN Jikai, MA Xiuwei, LI Jiang, et al. Analysis of the interaction of parallel dual APFs[J]. Power System Technology, 2017, 41(3): 956-961.

参数	参数变化趋势	λ_c变化趋势
Z₁	增大	逐渐减小至1
K_p	增大	从λ_c>1逐渐减小至λ_c<1
k_pu	增大	不变
k_iu	增大	不变

参数	参数变化趋势	λ_c幅值变化
K_p1	增大	从λ_c>1减少至λ_c<1
K_p2	增大	从λ_c>1减少至λ_c<1
R/Ω	增大	逐渐减少至1
X/Ω	增大	不变

设备名称	参数	取值
AC/DC1	u_dc/V	1 000
	开关频率f_s/kHz	10
	直流侧稳压电容C_ac/μF	2 200
AC/DC2	u_dc/V	1 000
	f_s/kHz	2
	C_ac/μF	2 200
负荷	直流电阻性负荷R_dc/Ω	30
	P/kW	10
交流系统	电压U/kV	0.6
光伏电源	输出功率P_out/kW	5
线路	R/(Ω·km^-1)	0.4
	X/(μH·km^-1)	500

设备	参数	取值
DC-APF1	L/mH	12.5
	C/μF	2 200
	u_c/V	1 300
DC-APF2	L/mH	10
DC-APF3	C/μF	2 200
	u_c/V	1 300

Z₁/Ω	η₁/%	η₂/%	η₃/%
0.4	2.15	1.50	2.71
0.8	1.36	1.00	1.69
1.5	0.78	0.57	1.06
2.0	0.59	0.48	0.78