Analysis of energy characteristics of electromechanical composite energy storage system for vehicles

doi:10.19799/j.cnki.2095-4239.2023.0778

Abstract

Abstract:

Limiting multiple energy conversions when recovering braking energy in hybrid electric vehicles is a new technical solution for the dynamic coupling of flywheel and powertrain systems. In these systems, the kinetic energy lost by a decelerating rear wheel can be stored in two forms: as electrochemical energy stored in the battery or as kinetic energy for the next acceleration. First, the energy-conversion characteristics of accelerating and decelerating vehicles are analyzed to deduce the conversion efficiency of electromagnetic couplers at mechanical and electrical ports under the rated state. Second, based on a system model established using Matlab and simulink, the power characteristics and energy characteristics of the system are discussed for a vehicle decelerating from an initial speed of 60 to 42 km/h. During deceleration, the output power of the electromagnetic coupler increases from 1.257 to 1.546 kW. The transmission power is about 1.14-1.41 times the rated power. In this process, 72.34% of the kinetic energy from the rear wheel can be directly stored in the flywheel, and 27.66% of the energy can be stored in the battery after being converted by the electric port of the electromagnetic coupler. Finally, we test the electromechanical composite energy storage system to verify the rationality of the system.

Key words: hybrid power, energy recovery, flywheel energy storage, electromagnetic coupler, energy conversion

CLC Number:

U 469.7

Hong LI, Jiangyi LV, Jiantong SONG, Dong YAN. Analysis of energy characteristics of electromechanical composite energy storage system for vehicles[J]. Energy Storage Science and Technology, 2024, 13(3): 906-913.

Figures/Tables 12

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Table 1

Parameters of vehicle electromechanical composite energy storage system"

参数	数值	参数	数值
汽车质量/kg	1500	第1级齿轮副速比	1∶4
车轮半径/m	0.3	第2级齿轮副速比	1∶5
飞轮转动惯量/kg $·$ m²	0.3	耦合器额定功率/kW	1.1
飞轮最高转速/(r/min)	20000	额定转速/(r/min)	1000
飞轮初始转速/(r/min)	5610	额定转矩/Nm	10

Table 1

Fig. 5

Table 2

Power conversion of electromechanical composite energy storage system"

外转子角速度/ $(r a d / s)$	内转子角速度/ $(r a d / s)$	输入功率 /kW	输出功率 /kW	转差功率 /kW
215.7	125.7	2.157	1.257	0.900
212.6	128.9	2.126	1.290	0.836
209.4	131.3	2.094	1.313	0.781
206.3	132.7	2.062	1.328	0.734
203.2	134.9	2.032	1.349	0.683
200.0	138.6	2.000	1.386	0.614
196.9	139.1	1.968	1.392	0.576
193.7	140.8	1.937	1.408	0.529
190.6	142.9	1.906	1.430	0.476
187.4	143.1	1.874	1.432	0.442
184.3	143.4	1.843	1.435	0.408
181.2	143.9	1.811	1.439	0.372
178.0	145.1	1.780	1.451	0.329
175.0	146.5	1.749	1.466	0.283
171.7	147.4	1.717	1.474	0.243
168.6	148.0	1.686	1.480	0.206
165.5	150.0	1.655	1.500	0.155
162.3	152.5	1.623	1.525	0.098
159.2	154.5	1.592	1.546	0.046

Table 2

Fig. 6

Table 3

Fig. 7

Table 4

Power characteristics of electromagnetic couplers"

时间/s	外转子角速度/ $(r a d / s)$	内转子角速度/ $(r a d / s)$	输入功率/W	输出功率/W	转差功率/W
2.09	199.2	27.1	4983.3	677.9	4305.4
2.79	197.2	43.3	4932.9	1082.8	3850.1
3.28	195.2	52.4	4882.5	1310.2	3572.3
3.92	192.1	67.5	4803.8	1687.9	3115.9
4.56	189.3	82.8	4734.5	2070.0	2664.4
5.33	185.4	96.8	4636.8	2420.3	2216.5
5.95	182.5	108.8	4564.4	2720.6	1843.8
6.75	178.7	129.9	4469.9	3248.3	1221.5
7.59	174.4	149.0	4362.8	3726.0	636.7
8.49	169.6	163.3	4243.1	4085.4	157.6

Table 4

Fig. 8

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参数	数值	参数	数值
内转子励磁电流/A	<1.8	额定功率/kW	4.0
耦合器额定功率/kW	4.0	额定转速/(r/min)	2890
耦合器额定转速/(r/min)	1528	额定转矩/Nm	13.2
耦合器额定转矩/Nm	25.0	储能飞轮惯量/kg·m²	2.99
耦合器磁极对数	3	惯性飞轮惯量/kg·m²	4.82
驱动电机额定电压/V	220	第1级V带传动比	1∶1.20
驱动电机额定电流/A	8.29	第2级V带传动比	1∶1.73

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