Topology Design and Stability Analysis of Bipolar DC Power System of Electric Unmanned Aerial Vehicle Feeding Mixed Load

doi:10.11985/2022.02.013

Abstract

Abstract:

The DC power system of electric unmanned aerial vehicles(UAVs) mainly provides reliable power for airborne equipment such as propulsion motors, environmental control systems, and radar. According to the bus scheme of system, the DC power system can be divided into unipolar architecture and bipolar architecture. To reduce the loss and volume of a motor and increase the fault tolerance of the system, bipolar architecture is widely used in UAVs and planes. However, since renewable energy generation systems such as fuel cells and photovoltaic usually output unipolar DC voltage, a unipolar-to-bipolar conversion interface is needed to realize unipolar-to-bipolar conversion. Firstly, two kinds of unipolar-to-bipolar conversion interfaces, namely voltage balancer and multilevel converter, are compared and analysed in terms of inductance current ripple, capacitor voltage ripple, and switch stress. Then, based on the comparison results, the multilevel converter is selected as the unipolar-to-bipolar interface, and the bus voltage and neutral-point-voltage controller are designed to realize the voltage and current control, and voltage balance of the bipolar DC power system. Finally, the effects of constant power load, constant current load, and constant resistance load widely existing in the DC system and controller parameters on system stability are analysed. The analysis result is verified by simulation.

Key words: Bipolar DC power system, neutral-point-voltage control, constant power load, stability analysis, Lyapunov method

CLC Number:

TM46

YUAN Cong, HUANGFU Yigeng, BAI Hao, LIU Yuntian, ZHANG Hongyu. Topology Design and Stability Analysis of Bipolar DC Power System of Electric Unmanned Aerial Vehicle Feeding Mixed Load[J]. Journal of Electrical Engineering, 2022, 17(2): 110-121.

Figures/Tables 23

References 15

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对比项目	符号	数值
电感数量/个	L-N_TL	1
电感数量/个	L-N_B	2
电容数量/个	C-N_TL	2
电容数量/个	C-N_B	3
管数量/个	S-N_TL	4
管数量/个	S-N_B	4
电感电流脉动标幺值	ΔI^_L*	4(0.5-d)d, d<0.5 4(1-d)(d-0.5), d>0.5
电感电流脉动标幺值	ΔI^_L*₁	4(1-d)d
电容电压脉动标幺值	ΔV^_C*₁	d, d<0.5 1-d, d>0.5
	ΔV^_C*₂	d, d<0.5 1-d, d>0.5
	ΔV^_C*₃	d
	ΔV^_C*₄	d
	ΔV^_C*₅	d
开关管应力	S₁	0.5u_PN
	S₂	0.5u_PN
	S₃	u_PN
	S₄	u_PN
	S₅	u_PN

名称	参数	数值
发电设备	输出电压E/V	160
三电平Boost变换器	电感L/H	2.173×10^-4
	电容C₁/F	7.239×10^-5
	电容C₂/F	7.239×10^-5
母线	PO端电压u_POref/V	270
	ON端电压u_ONref/V	270
	PN端电压u_PNref/V	540
负载	恒阻负载R₁/Ω	145.8
	恒阻负载R₂/Ω	145.8
	恒功率负载CPL₁/W	2 000
	恒功率负载CPL₂/W	2 000
	恒流负载CCL₁/A	1.852
	恒流负载CCL₂/A	1.852
电压电流控制器	电压外环k_pV	0.2
	电压外环k_iV	100
	电流内环k_pI	0.005
	电流内环k_iI	100
中位点电压控制	比例系数k_pO	0.000 3
中位点电压控制	积分系数k_iO	0.008