Research on optimal operation of traction power supply system with integrated hybrid energy storage and RPC

doi:10.19799/j.cnki.2095-4239.2022.0664

Abstract

Abstract:

The electric phase of electrified railway constitutes a no-power zone, which hinders the energy transfer in each power supply area, is not conducive to the recovery and utilization of regenerative braking energy, and greatly affects the railway operation efficiency. In order to reduce the railway operation cost, the railway power conditioner (RPC) is connected in the electric phase, and the RPC DC link is convenient for the hybrid energy storage system (HESS) to access. On this basis, an optimal operation strategy of traction power supply system (TPSS) is proposed in this paper. By controlling the charge and discharge of HESS, the load peak is reduced and the braking energy is recovered, so as to realize the peak cutting and valley filling of traction load. The model aims to minimize the total operating cost of TPSS, and takes HESS charging and discharging power as decision variables. Furthermore, the nonlinear function in the model is linearized to obtain the mixed integer linear programming model, and then CPLEX is applied to obtain the charging and discharging strategy of HESS and the power purchase scheme of TPSS. Finally, based on the measured data, the cost-reduction effect of the proposed model is analyzed. Compared with the existing TPSS, the daily operating cost of the TPSS is significantly reduced after the HESS and RPC are connected, which provides a basis for the optimization operation of the TPSS.

Key words: energy storage, peak load shifting, charge-discharge control strategy

CLC Number:

TM 922.3

Wenzhe DONG, Sile YANG, Zongyou LIANG, Yinyu CHEN. Research on optimal operation of traction power supply system with integrated hybrid energy storage and RPC[J]. Energy Storage Science and Technology, 2023, 12(4): 1185-1193.

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项目	参数名称	参数取值
牵引变压器	V/v牵引变压器变比	220/27.5
牵引变压器	V/v变压器容量/MW	30×2
RPC	降压变压器变比	27.5/1
	直流电容/mF	3.5
	交流电感/mH	2
	直流侧电压/V	6000
	额定容量/MW	15

储能装置参数	电池	超级电容
SOC范围	[0.2,0.8]	[0.2,0.95]
始/末SOC	0.5/0.5	0.5/0.5
额定容量/MWh	5	0.3
额定功率/MW	0.5	4
充/放电效率	0.8/0.8	0.95/0.95

参数	案例1	案例2	案例3
最大需量功率/MW	12.69	11.18	9.41
系统总能耗/MWh	8891.05	7800.00	7151.70
再生制动能量利用率/%	—	48.79	83.19

参数	案例1	案例2	案例3
电度电费/万元	13.45	11.87	10.68
需量电费/万元	1.77	1.57	1.32
回馈电能费用/万元	3.28	1.69	0.58
混合储能装置运维成本/万元	—	—	0.29
总成本/万元	18.49	15.12	12.87
总成本优化率/%	—	18.23	30.39

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