Control Strategy for Electric Workover Rig Super Capacitor Energy Storage System with Grid-connected Transformer Protected

doi:10.11985/2021.02.016

Abstract

Abstract:

While electric workover rigs runs, the current of grid-connected transformer is usually over its rated current. It is serious to endanger to its safety operating. The control strategy of super capacitor energy storage system with grid-connected transformer protected is proposed. The mode switching is designed to regulate 6 operation modes, which is controlled by program. The over-current protection of grid-connected transformer is thought as the primary control, and the capacity regulating control as well as DC bus voltage stable control are completed. Not only the grid-connected transformer running safety is ensured, but also the workover rigs feedback energy is absorbed quickly. These electric energies are saved and utilized again. Based on the PSIM simulation platform, the proposed control strategy is adopted. The simulation of the super-capacitor energy storage control for electric workover rig is executed. The results verify that the presented control method is correct, feasible and effective.

Key words: Electric workover rig, super capacitor, grid-connected transformer protected, mode switching

CLC Number:

TM561

WU Wenjun, WANG Sijia, CAI Jiaqi. Control Strategy for Electric Workover Rig Super Capacitor Energy Storage System with Grid-connected Transformer Protected[J]. Journal of Electrical Engineering, 2021, 16(2): 122-130.

Figures/Tables 13

References 21

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参数		数值
电动修井机的供电系统	变压器容量S/(kV·A)	50
	二次侧交流侧相电压/V	220
	输入滤波电容C_d/μF	5 000
超级电容储能系统	滤波电感L/mH	1.5
	功率P_sc/kW	80
	超级电容容量/F	44.8
	超级电容内阻/mΩ	19.43
	超级电容电压上限值/V	355
	超级电容电压下限值/V	185
系统控制参数	网侧电流保护值I_s-ref/A	76
	电流充电系数k	0.8
	P_min/kW	1
	直流母线电压下限U_dc-low/V	520
	直流母线电压上限U_dc-up/V	585
	直流母线电压阈值U_dc_-max/V	600
	开关频率/kHz	5