Research on Electromechanical Coupling Dynamic Characteristics and Control of High-power Diesel Generator Set for Vehicle

doi:10.12382/bgxb.2024.0397

Abstract

Abstract:

The high-power diesel generator set for vehicles is the power supply unit of heavy-duty series hybrid electric vehicles.Due to the coupling effect of the torque impact of multi-cylinder diesel engine crankshaft and the electromagnetic torque pulsation of generator,the system torsional vibration phenomenon is prominent,and the dynamic quality is poor.A dynamic model of engine-generator set considering the electromechanical coupling effect is established,and the influence of electromechanical coupling effect on the inherent characteristics of the system is analyzed.The law of variation of torsional vibration characteristics with the parameters,such as electromagnetic stiffness,rotor eccentricity and torsional damper stiffness,is revealed.The dynamic response characteristics of the system under the combined excitation of engine and motor are analyzed,and the order of the main response is clarified.A torsional vibration control overall framework based on dual loop decoupling is proposed to solve the problem of excessive low-frequency torsional vibration response.An independent modal space optimal controller for the start stop process and an adaptive filtering compensating controller for steady-state operating conditions are designed for the suppression of engine main harmonic disturbances,and are verified through simulation.The results show that the proposed torsional vibration active control algorithm can achieve the suppression of main harmonic torsional vibration in the full speed domain of the engine.

Key words: diesel generator set, electromechanical coupling, dynamic model, vibration control

CLC Number:

U461

HAN Zhengda, WU Yunhao, ZHANG Wei, LIU Yi, LIU Jingang, ZHU Weiguo. Research on Electromechanical Coupling Dynamic Characteristics and Control of High-power Diesel Generator Set for Vehicle[J]. Acta Armamentarii, 2025, 46(4): 240397-.

Figures/Tables 37

Fig.1 Component block diagram of diesel generator set for vehicles

Fig.2 Engine output torque characteristics (crankshaft speed:1800r/min)

Fig.3 Generator output torque characteristics

Fig.4 Torsional vibration model of diesel generator set

Table 1 Comparisons of groove sizes set

编号	部件	编号	部件	编号	部件	编号	部件
1	减振器被动端	7	气缸3	13	气缸7	19	气缸11
2	减振器主动端	8	气缸4	14	气缸8	20	气缸12
3	轴颈1	9	轴颈3	15	轴颈5	21	轴颈7
4	气缸1	10	气缸5	16	气缸9	22	飞轮
5	气缸2	11	气缸6	17	气缸10	23	增速齿轮副
6	轴颈2	12	轴颈4	18	轴颈6	24	发电机

Table 2 Effect of generator field on natural frequency of system Hz

耦合条件	1阶	2阶	3阶	4阶	5阶
考虑机电耦合	45.5	97.4	113.6	274.4	425.1
忽略机电耦合	61.6	97.4	260.7	274.4	533.7

Fig.5 Comparison of the 1st to 4th-order natural vibration modes

Fig.6 The influence of internal power factor angle on system vibration characteristics

Fig.7 The influence of motor armature current on the system

Fig.8 The influence of eccentricity of motor rotor on the system

Fig.9 Generator shaft torque response under no-load condition

Fig.10 Response of torsional vibration angular displacement under no-load condition

Fig.11 Torsional vibration angular acceleration-time curve under no-load conditions

Fig.12 Three-dimensional spectrum of unloaded acceleration

Fig.13 Frequency spectrum of shaft torque during loading

Fig.14 Vibration angle displacement spectrum of generator rotor

Fig.15 Decoupling type dual loop control structure diagram

Fig.16 Decoupling conditions for main and auxiliary controllers

Fig.17 Block diagram of independent modal space control

Fig.18 J1 response to cylinder excitation

Fig.19 J2 response to cylinder excitation

Fig.20 J3 response to cylinder excitation

Fig.21 J9 response to cylinder excitation

Fig.22 J10 response to cylinder excitation

Fig.23 J11 response to cylinder excitation

Fig.24 Speed fluctuation at torsion damper driven endand generator end

Fig.25 Speed fluctuation at torsion damper driven end and generator end

Fig.26 Rotation speed fluctuation

Fig.27 Block diagram of adaptive torsional vibration control

Fig.28 Control level σ

Fig.29 Output shaft speed fluctuation(steady condition)

Fig.30 Engine speed

Fig.31 Output shaft speed fluctuation(dynamic condition)

Fig.32 Hardware in the loop testing platform

Fig.33 Simulated results of hardware in the loop test

Fig 34 Motor shaft torque (test speed:1400r/min)

Fig 35 Motor shaft torque (test speed:1800r/min)

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