Grid-connected switch control strategy suitable for energy storage converter in microgrid

doi:10.19799/j.cnki.2095-4239.2021.0271

Abstract

Abstract:

An in-depth study is conducted on the grid-connected switch control problem suitable for the seamless switching control of a microgrid. Moreover, the influence of the zero-crossing turn-off characteristics of the silicon-controlled rectifier (SCR) switch on the local load is analyzed. The SCR forced shutdown control strategy is proposed to ensure the stability and reliability of the local load power supply. This study also investigates the factors affecting the turn-off time and obtains the transformation relationship between the local load voltage and the grid-connected current. Finally, an experimental platform is built, and related experiments are performed. The experimental results prove the rationality and the effectiveness of the theoretical analysis and the strategies proposed herein. In summary, the proposed strategy can ensure well the safety of the load's power consumption during the on-grid/off-grid switching process of the microgrid.

Key words: microgrid, SCR, seamless switching control, forced shutdown control strategy

CLC Number:

TM 911

Yanping WEI, Jun WANG, Nanfan LI, Changli SHI. Grid-connected switch control strategy suitable for energy storage converter in microgrid[J]. Energy Storage Science and Technology, 2022, 11(1): 156-163.

Figures/Tables 13

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Fig. 8

Fig. 9

Table 1

Table 2

energy storage converter parameters"

参数	数值
额定输出功率/kW	100
直流侧额定电压/V	720
交流侧额定相电压/V	220
额定频率/Hz	50
开关频率/kHz	6
LCL滤波器机侧电感/mH	0.6
LCL滤波器网侧电感/mH	0.5
LCL滤波器滤波电容/ $μ F$	60

Table 2

Fig. 10

Fig. 11

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参数	数值
正向阻断电压/V	1600
正向额定电流/A	180
导通压降/V	1.03

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