Stability Analysis and Optimization Strategy of Electric System for Electric Tracked Vehicles

doi:10.12382/bgxb.2023.0766

Abstract

Abstract:

In order to improve the stability of electric system of electric tracked vehicle, asmall signal analysis method based on impedance modelis used to model the DC microgrid system built by power electronic source network load and storage of electric tracked vehicle. Combined with the working conditions of electric tracked vehicle, the stability rule and mechanism of the system under different working conditions and different parameters are analyzed from the perspective of impedance matching. At the same time, in order to optimize and improve the stability of electric system for the electric tracked vehicle, a voltage-based feedback channel and a virtual capacitor control link are designed in the engine-generator set and DC/DC control loop, respectively.Thecontrol link can adapt to the voltage fluctuation for control, thus improving the stability of electric system in the electric tracked vehicle. Finally, the effectiveness and feasibility of the proposed method are verified by simulation.

Key words: tracked vehicle, electric drive, stability, electric system, DC microgrid

CLC Number:

TJ810.2

LI Yaoheng, GAI Jiangtao, ZHANG Nan, CHENG Cheng, LI Cuifen, SHUAI Zhibin, DIAO Lijun. Stability Analysis and Optimization Strategy of Electric System for Electric Tracked Vehicles[J]. Acta Armamentarii, 2024, 45(10): 3397-3414.

Figures/Tables 23

Fig.1 Power supply topology of electro-mechanical drive electrical system

Fig.2 The fluctuation of bus voltage collected by real vehicle

Fig.3 The volt-ampere characteristics of voltage under different impedance characteristics

Fig.4 The topology of DC/DC

Fig.5 Small signal block diagram of DC/DC topological loop and control link

Fig.6 Schematic diagram of cascade system

Fig.7 Schematic diagram of stability criterion

Fig.8 Stability analysis of electro-mechanical composite drive electrical system in constant torque region

Fig.9 Stability analysis of Electro-mechanical composite drive electrical system in constant power region

Fig.10 Electrical stability control improvement strategy of engine-generator set

Fig.11 Schematic diagram of DC/DC virtual capacitor control

Fig.12 Comparison of system stability margins before and after adding virtual capacitor

Fig.13 The improvement strategy of electrical stability control of DC/DC+ power battery

Fig.14 Fluctuation of bus voltage

Table 1 State analysis under different voltage variation trends

阶段	电压变化情况	电压变化率符号	虚拟电容变化情况
o→a	正向增加	正	增大
a→b	正向减少	负	降低
b→c	负向减少	负	增大
c→d	负向增加	正	降低

Fig.15 Block diagram of control strategy for stability optimization and improvement of electric drive track electrical system

Fig.16 Change of DC bus voltage under power change rate

Fig.17 Change of motor phase current under power change rate

Fig.18 Improved ffect of system after optimization and promotion strategy being applied on the side of engine-generator set

Fig.19 Comparison of voltages before and after optimization

Fig.20 Voltage changes before and after applying the optimization and promotion strategy to DC/DC power battery

Fig.21 Output currents of DC/DC before and after improvement

Fig.22 Waveform of adaptive change of virtual capacitance

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