Power Distribution Control Strategy of Diesel-electrical Unmanned Systems

doi:10.12382/bgxb.2025.0500

Abstract

Abstract:

To solve the problem of power distribution in unmanned diesel-electrical power system，this paper proposes an improved constant power control strategy of inverter.The active power control command of the strategy is obtained by calculating the frequency deviation and droop coefficient，and its reactive power control command is obtained by calculating the voltage deviation and droop coefficient.The control strategy can be used to directly introduce the dynamic changes in the frequency and voltage of diesel-engine generator into the inverter control，equally distribute the power to the inverter and diesel-engine generator when operating in parallel by properly setting the droop coefficients，and deal with the generator overload or reverse power caused by sudden loading or unloading in unmanned systems.Simulation and experiment verify that the proposed control strategy is feasible and effective.

Key words: diesel-electrical system, unmanned system, inverter, constant power control, power distribution

ZHANG Xueyan, JIANG Yuanzhi, XIAO Han, CHEN Yashi, CUI Derui. Power Distribution Control Strategy of Diesel-electrical Unmanned Systems[J]. Acta Armamentarii, 2025, 46(S1): 250500-.

Figures/Tables 19

Fig.1 Structural diagram of the isolated power system

Fig.2 Topological structure of inverter

Fig.3 Constant-power control block diagram of inverter

Fig.4 Control block diagram of diesel generator

Fig.5 Generator droop characteristic curves

Fig.6 Inverter droop characteristic curves

Fig.7 Block diagram of improved constant-power control

Fig.8 Line impedance compensation link

Fig.9 Structure diagram of simulation model

Table 1 Parameters of simulation model

参数	数值
逆变器额定容量S_invN/（kV·A）	1250
发电机额定容量S_gN/（kV·A）	937.5
直流母线额定电压U_dcN/V	700
交流母线额定线电压U_N/V	390
逆变器输出滤波电感L_m/mH	70
滤波电感等效串联电阻R_m/mΩ	0.15
逆变器输出滤波电容C_f/μF	1000
滤波电容等效串联电阻R_c/mΩ	20

Table 2 Control parameters

参数	数值
逆变器有功PI控制器比例系数K_pp	0.1
逆变器有功PI控制器积分系数K_ip	30
逆变器无功PI控制器比例系数K_pq	0.5
逆变器无功PI控制器积分系数K_iq	20
发电机电压PI控制器比例系数K_pv	60
发电机电压PI控制器积分系数K_iv	200
发电机转速PI控制器比例系数K_pn	80
发电机转速PI控制器积分系数K_in	100
发电机有功—频率下垂系数m_p	0.03
发电机无功—电压下垂系数n_q	0.03
柴油机等效惯性时间常数T_D/s	0.1
限幅环节上限P_max（Q_max）	1.1
限幅环节下限P_min（Q_min）	0

Fig.10 Simulation results of sudden loading of Case 1

Fig.11 Simulation results of sudden unloading of Case 1

Fig.12 Simulation results of load change under all conditions

Fig.13 Simulation results of sudden loading without line impedance compensation

Fig.14 Simulation results of sudden loading with line impedance compensation

Fig.15 Experimental system

Fig.16 Experimental results of sudden loading

Fig.17 Experimental results of sudden unloading

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